Dissertations / Theses on the topic 'EMissions management'

Uppsala municipality has set a goal in line with the UN’s 2030 Agenda for sustainable development to be fossil-free by 2030. To achieve this a lot of local companies have signed the Uppsala Climate Protocol. One of these companies is the municipal facility management company AB Uppsala Kommun Industrihus, Ihus. This project aimed to help Ihus map their emissions connected to facility maintenance and management and to enable them to reach their goal of becoming climate neutral by 2030.  The daily facility management was split up into the categories gardening, ventilation and installation, cleaning and facility work, materials and products, renovations, and painting. A sustainability spend analysis was performed on Ihus’ organisation and emissions per spent MSEK were calculated for each category by researching Ihus’ suppliers. By using those emission intensities, the two categories with the highest emissions could be identified as renovations and materials and products with intensities of 84.48 and 57.56 tonnes CO2e/MSEK, respectively. The remaining categories all had intensities below 3 tonnes CO2e/MSEK.  Sensitivity analyses were performed on the results by tweaking the values of which the emissions were based on. The results showed that to lessen Ihus’ climate impact the areas of improvement are life cycle assessments for their facilities and overseeing transports.

Climate warming has the potential to alter carbon (C) and nitrogen (N) cycling affecting greenhouse gas (GHG) emissions and a range of other ecosystem functioning in grasslands. This will be particularly important for the sustainability of agricultural ecosystems due to its role in global food security and soil C sequestration. The interaction between climate warming and grassland management is highly important and needs to be addressed as it may change the direction and strength of the effects on GHG emissions by changing plant productivity (either above and/or below-ground) and plant-soil properties. Plant species composition also plays a key role affecting the nutrient cycling thus GHG emissions in grasslands. The aim of this thesis is to understand how grassland management will influence C and N cycling under future climate change. The interactive effect of climate warming and grassland management is investigated in a field experiment over two growing seasons with varied microclimate effects, and the effect of plant composition manipulation in a controlled temperature mesocosm experiment. Overall, interactions between warming and management significantly affected GHG fluxes and plant-soil properties with important single treatment effects. The role that below-ground components plays on GHG emissions was less evident, becoming unclear the mechanisms related to gas releases to the atmosphere. Increases in legume proportions in grass-legume mixtures reduced ecosystem respiration in fertilised soils, with no effects in unfertilised soils. N cycling was not affected by increases in legume proportions. Plant productivity including above- and below-ground biomass had a non-linear relationship with relative legume proportion. Either grassland management or different plant species compositions approach may improve C sequestration and reduce GHG emissions.

Carbon dioxide (CO2) and nitrous oxide (N2O) concentrations in the atmosphere have greatly increased in recent times. Intensive agricultural practices, combustion of fossil fuels, deforestation, and wetland drainage have been linked to increased greenhouse gases (GHG) levels. Although scientists are not unanimous in their belief that the increases in GHG is a cause behind recent global temperature rise, there is evidence that increases in GHG might directly increase global temperatures and unpredictable weather occurrences. Since human activity may be partially behind the rise in GHG emissions, it follows that changes in agricultural management might reduce the rate of GHG increases or even mitigate existing increases. Agricultural management practices proposed to mitigate GHG emissions in agricultural soils include conservation tillage, diversified cropping systems, and crop residue management. The objective of this study was to determine the impacts of high-residue no-till systems in a diverse rotation using seven cropping systems in which winter wheat (Triticum aestivum L.) was included or not included. The study was imposed on existing rotations present at the Conservation Cropping Systems Project (CCSP) farm near Forman, ND. The CCSP site was established in 2001 under no-till production and managed by the Wild Rice Soil Conservation District. Analysis of 2006 and 2010 soil organic carbon (SOC) data showed no significant difference between winter wheat rotation treatments and rotation treatments without winter wheat. Analysis of 2012 SOC data resulted in greater SOC in the corn (Zea mays L.)-soybean (Glycine max L.) rotation and lower SOC in the spring wheat (Triticum aestivum L.)-winter wheat (Triticum aestivum L.)-cover crop-soybean rotation. Some rotations had greater SOC than others, but the differences were not related to whether or not winter wheat was included in the rotations. Analysis of residue showed a greater C:N ratio and greater potential N requirement for the subsequent crop in fresh residue compared to aged residue. The COMET-VR model used to estimate SOC levels overestimated SOC in greater diversified rotations and underestimated SOC in lower diversified rotations. No-till production and crop residue retention can increase SOC levels, improve soil quality, and increase SOC sequestration in cropping systems.

Traffic growth, capacity constraints, climate change and the necessity to develop a more cost efficient system led to an ambitious initiative to reform the architecture of airspace management. This initiative, launched by the European Commission (EC), is called Single European Sky (SES). The four Key Performance Areas (KPAs) of SES are environment; cost efficiency; capacity; and safety. In the environment KPA Performance Indicators for Air Navigation Services Providers (ANSPs) are established to ensure that improvement in sustainability is achieved. In addition, aviation is included in the European Union's Emission Trading Scheme (EU ETS): the EC sets limits on CO2 emissions and provides economic incentives to airlines to reduce emissions by establishing a market-based trading system. EU-ETS can be used to simultaneously promote economic efficiency and achieve environmental goals on a sustainable basis. The PhD research examines the existence of cancel-out effects between supply-led, i.e. SES, and demand-led management, i.e. EU ETS, policies by following a holistic approach. Environmental economics theory and industrial economics are applied to identify factors that have a significant influence on the two policies. Interestingly, and in spite of common objectives, the two schemes are governed by different bodies, which may fail to streamline their communication process. Hence, the PhD thesis also addresses the issue of governance and its possible failure regarding the full implementation and efficiency of the schemes. From a methodological perspective, Delphi is conducted in two rounds to encapsulate policy complexity at an in-depth level. The target population comprises stakeholders involved in SES and EU ETS. To select candidates purposive and snowball sampling was used. Thus, the sample consists of 39 senior managers/experts from Civil Aviation Authorities; ANSPs; aviation-related organisations and institutions; and airlines. Based on the results of the Delphi and building on its theoretical background, the PhD thesis then develops a conceptual model to address governance failure, thus effectively linking supply- to demand-oriented aviation policies in a holistic manner.

El sector de pasta i paper és considerat un dels set sectors industrials més intensius en consum energètic. La producció i consum d'electricitat i de vapor esdevenen les fonts majoritàries d'emissions de gasos d'efecte hivernacle en aquest sector industrial. Les fàbriques papereres poden assolir objectius de reducció d'emissions mitjançant reducció en origen (substitució de combustibles, introducció d'energies renovables) o bé a partir de mesures d'eficiència energètica en el propi procés. En aquest context, s'ha desenvolupat un mètode de distribució d'emissions que permet assignar a cada unitat d'operació del procés paperer, el seu grau de responsabilitat en emissions. També s'han avaluat diferents mètodes de càlcul de factors d'emissió de vapor i electricitat, tant per plantes de cogeneració com per sistemes individuals. A partir d'aquesta avaluació s'han proposat nous mètodes alternatius als analitzats. Aquests mètodes i els factors d'emissions s'han aplicat a dues fàbriques papereres catalanes.<br>Pulp and paper sector is considered one of the seven industrial sectors with a higher energy intensive profile. Power and steam production and consumption are the main responsible for green house gas emissions of this industrial activity. Paper industries can achieve reductive emission targets by considering emissions origin (replacing fuels, aplying renewable energies) as well as improving energy efficiency of the process itself. An emission allocation tool has been developed with the purpose of approaching to each unit operation of the papermaking process its related emissions share. In addition, energy-emission factors regarding power and steam generation in combined heat and power plants and in single heat and power systems have been evaluated. Some new methods for calculating different emission factors have been proposed after the analysis. Two Catalan paper mills have been used as case-studies to apply, both allocation method and emission factors.

Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, February 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 84-87).<br>In 2009, the European Parliament agreed to limit the CO2 emissions from new passenger cars sold in the European Union to an average of 130g/km by 2015. Further, a probable longer-term CO2 emissions target of 95g/km is specified for 2020. This thesis attempts to assess the feasibility of meeting these targets in a representative European Union by developing and evaluating Optimistic and Realistic scenarios of varied powertrain sales mix, vehicle weight reduction levels, and Emphasis on Reduction of Fuel Consumption (ERFC) using a European New Passenger Cars CO2 Emissions Model. Further, this thesis develops custom fleet models for select member states to understand the impact of the developed scenarios on reduction of fuel use and on the diesel to gasoline fuel use ratio. The thesis finds that while the European Union is poised to meet the 2015 target in an Optimistic scenario, it will find it difficult to do so in a Realistic scenario. Moreover, the 2020 target would not be achieved in either of the two scenarios. Further, the diesel to gasoline fuel use ratio will continue to rise through year 2020 for the studied countries, potentially reaching as high as 3 in the case of France and at least as high as 0.71 in the case of Germany. Finally, an increase in ERFC and introduction of PHEVs would most help reduce fuel use in all studied countries. In France and Italy, a reduction of Diesel car sales would additionally be significantly useful in reducing the fuel use. Whereas, in Germany and UK, a higher number of Turbocharged Gasoline cars would be another significant option to reduce fuel use.<br>by Kandarp Bhatt.<br>S.M.in Engineering and Management

<p>Among the many models and tools available for solid waste management (SWM), the integrated SWM decision support tool (ISWM DST) developed at North Carolina State University provides a comprehensive and integrated approach that considers cost and environmental factors associated with a large set of waste processing options. ISWM DST is designed to generate alternative SWM strategies that meet user-defined cost and environmental objectives. In addition to an array of site-specific inputs, this tool includes a large number of model parameters, which are currently treated deterministically with point estimates for inputs. A high degree of variability and uncertainty is known to exist in these input parameters, affecting the uncertainty in the model outputs. The absence of a systematic procedure to consider uncertainty in ISWM DST is a major drawback. The goal of this study is to develop and incorporate an uncertainty analysis component into ISWM DST. A Latin Hypercube Sampling (LHS) procedure is coupled with a simulation approach to enable uncertainty propagation. The capabilities of this new component are demonstrated using a realistic case study in which a series of scenarios are examined assuming uncertainty in a subset of the input parameters. For each scenario, the alternative strategy development capabilities of ISWM DST is first applied, the then each SWM strategy is evaluated under conditions of uncertainty. Performance of alternative strategies is compared, and more reliable or robust strategies are identified. New and useful insights that were not apparent under deterministic conditions were gained, contributing more information to assist in SWM decision making. Further, correlation analysis was conducted to identify the uncertain input parameters that contribute mostly to the output uncertainty. This information is also expected to be valuable in making more informed decisions. In summary, this research contributes by significantly enhancing via the uncertainty analysis component the broad array of powerful capabilities of ISWM DST, making this tool more applicable in SWM planning and design practice. <P>

This research presents the development and application of generic methodologies for the production of a spatially resolved emissions inventory for the North West region of England. The overall purpose of the estimates is to provide emissions data for use within air quality management applications. The North West region is used as the basis of the work due to being composed of a number of administrative units and providing the regional context for local air quality management in the main urban areas of Greater Manchester and Merseyside. Estimates are made for the key urban pollutants (CO, NOx, VOCs, PM and S02) from anthropogenic sources in 1994 and are shown at a variety of spatial scales. Data are available in terms of a regional 5 x 5 km grid, a sub-regional 1 x 1 km grid or at the scale of the original data source. Source categories, which correspond to broad management groupings, comprise road transport; rail transport; airports; shipping; industry; (Part A and Part B); and other (domestic and commercial) sources. Estimation procedures are developed in relation to readily available data sources and are applied within a GIS environment. The use of GIS has been shown to be an appropriate tool for the development of spatially resolved inventories and has further potential in relation to additional applications of the resultant emissions data. The requirements of producing a generic methodology which uses readily available data sources has been found to limit the degree of detail with which it is possible to develop estimation procedures. One of the principal limitations is the availability of comparable activity data for a number of administrative units. However, the results of the inventory are shown to be useful for a number of air quality management activities, including the identification of patterns of emissions at different scales of investigation and the identification of the location and causality of emission 'hotspots'.

Freight transport is a large contributor to emissions of CO2 and to mitigate its environmental impact is essential in strive for a sustainable future. Existing reports usually discuss the issues from a national or global perspective, but rarely provide any concrete or practical information on an organizational level. This report aims to describe the key driving factors of CO2 emissions caused by freight transport and recommend suitable measures for organizations to mitigate their environmental impact. To do this, a case study at Atlas Copco’s business area Industrial Technique (ITBA) is performed, four different business scenarios are created and the emissions from the scenarios are simulated. ITBA is a decentralized organization with most of the production sites and sub suppliers in Europe. Over 90% of the finished goods are sent to a distribution center in Belgium and then delivered to the customers. Today, most customers are located in Europe and this market accounts for nearly 80% of the distributed weight. However, ITBA believe in a strong growth in the North American and Asian markets and that the customer base will look much different in 2020. More customers at longer distances from the distribution center will lead to a heavily increased use of air freight, resulting in higher emission levels. This study shows a clear correlation between the total CO2 emissions and the share of air freight. In order for ITBA to expand their business and at the same time lower their emissions, actions are required. This report shows that a lower share of air freight and the use of several decentralized distribution centers can reduce the emissions significantly. Other means to lower the emissions include relocation of production sites, education to increase the awareness within the organization and including environmental performance when evaluating third party logistics.

The second generation bioenergy crops Miscanthus x giganteus and short rotation coppice (SRC) willow are the two main bioenergy crops in the UK and have become an integral part of legislation to provide an alternative to fossil fuels and to reduce national greenhouse gas (GHG) emissions. To reach emission targets, it is estimated that approximately 350,000 ha of land could be made available for bioenergy crops by 2020. Despite the promise of these crops, there have been very few field-studies regarding soil GHG (CO2, CH4 and N2O) emissions and many of the published studies are life cycle analyses or modelled fluxes from soils using default values from the IPCC. The first aim of this research was to quantify the in situ soil GHG budget and to establish the drivers of these GHG fluxes for Miscanthus and SRC willow. The second aim of this research was to provide a more in-depth understanding of C cycling under Miscanthus i.e. litter and roots through two field experiments. Overall, the results from this work confirm minimal emissions of CH4 and N2O from soil under Miscanthus and SRC willow. CO2 flux was found to be the major efflux from soils and it was found in Miscanthus, that the majority of this flux was derived from below ground respiration. Litter played an important part in providing nutrients to the soil, which is vital in systems that are not fertilised. Litter also contributed to SOM accumulation on the soil surface and may promote long-term C sequestration. The results from this work combined with other literature would suggest that these second generation crops offer advantages to first generation crops, but more field-based studies are required to say if they can offer the large-scale GHG savings needed to be a viable alternative to fossil fuels.

Many legacy infrastructures are reaching the end of their service life. The necessary replacement of these infrastructures creates an opportunity to replace them with environmentally friendly and innovative systems. The steam plant at the University of British Columbia is one of those cases requiring replacement due to aging. The steam generation boilers are, on average, 53 years old and have short expected remaining service. The boilers process is fed by natural gas as main fuel. It was identified that almost 80% of the CO₂e emissions on campus are produced from the use of gas for heating purposes. UBC is worldwide recognized for being one of the most sustainable university campuses, and the first university in Canada awarded a gold rating in sustainability. UBC’s GHG emissions targets for Kyoto protocol were reached in 2007; at that point, new aggressive reduction targets were established, aiming for 33% by 2015, 67% by 2020 and 100% by 2050. These reductions are expressed in tonnes of CO₂e. The situation described offers an opportunity to explore alternatives for the Steam Plant potential replacements. The Infrastructures Interdependencies Simulator (I2Sim) was selected as simulation platform for this study. The simulator allows real-time resource management using hourly historical operational data. To meet the campus thermal requirements, the system considers biomass cogeneration, heat pump, and excess electricity to offset traditional natural gas fuel sources. All technologies take advantage of real-time management of fuels allocation to reduce GHG emissions. A parallel distribution system based on hot-water is modeled, because of the potential in increasing the overall heating system performance. Four modeling scenarios are constructed, showing that fuel costs can be reduced by 51%, GHG emissions reduced by 76% and overall energy consumption reduced by 29%. The simulator is a first step in integrating all critical infrastructures into a Smart Energy MicroGrid paradigm.

Thesis: Ph. D. in Architecture: Building Technology, Massachusetts Institute of Technology, Department of Architecture, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 109-117).<br>To reduce greenhouse gas emissions associated with their buildings' energy use, owners frequently rely on building energy models that are calibrated to existing conditions for evaluation of potential energy efficiency retrofits. Development of such calibrated models requires the estimation of a series of building characteristics, a process which is extremely effort-intensive even for a single building and, therefore, almost prohibitive for large campus projects which often include hundreds of diverse-use buildings. There is a need for a framework that combines established urban energy model generation techniques with data-driven methods to reduce the manual and computational cost of developing calibrated baseline campus energy models, allow for real time evaluation of future building upgrades, and display their consequences to decision makers on an ongoing basis. This dissertation addresses this need by proposing new workflows for different development stages of models designed to evaluate future energy scenarios for large institutional campuses. First, the strengths and limitations of different urban modeling methodologies are assessed (modeling approach). Next, a methodology to employ statistical surrogate models is proposed for rapid estimation of unknown building properties (auto-calibration). Finally, a continuous energy performance tracking framework is presented to enable university campuses to manage their building related greenhouse gas emissions over time (continuous planning). As a proof of concept, the complete method has been implemented and tested at the author's home institution. Auto-calibration and continuous planning can be implemented independently or combined, and the dissertation includes a discussion about their possible impact if applied across the building stock.<br>by Shreshth Nagpal.<br>Ph. D. in Architecture: Building Technology<br>Ph.D.inArchitecture:BuildingTechnology Massachusetts Institute of Technology, Department of Architecture

Micro-irrigation scheduling, fertigation and mulching can be used by growers to improve the nutrient and water-use efficiency of crop production. Agriculture contributes to global warming through emission of greenhouse gases CO₂ N₂O, and CH₄. There is little information about how management practices affect N₂O emissions from vineyard and orchard soils. In a two year field experiment, N₂O fluxes from a grape (Vitis vinifera L.; Merlot) vineyard and an apple (Malus domestica Borkh; Ambrosia) orchard under microirrigation in the semiarid Okanagan Valley of British Columbia were measured using static chambers. Soil mineral N and organic carbon, environmental variables and fruit yield were also monitored. Treatments in the grape vineyard involved micro-irrigation types (Drip or Micro-sprinkler), nitrogen sources (surface-applied compost or fertigated Urea; 40kg N ha‐¹), and two floor managements (surface-applied shredded bark and wood Mulch or Clean - bare soil). Treatments in the apple orchard involved drip irrigation frequency (twice per day or twice per day on every 2nd day) delivering the same total amount of water, orchard floor management (Mulch or Clean) and nitrogen application rate applied as calcium nitrate by fertigation (20 or 40 g N tree‐¹). Spring thaw accounted for 30 to 50% of annual emissions in both experiments. Over a period of two complete years in the grape vineyard Micro-sprinkler irrigation reduced growing season N₂O emissions by 29% (compared to Drip) and on an annual basis Mulch decreased them by 28% (compared to Clean ). In the apple orchard irrigation every 2nd day reduced N₂O emissions by 30% and application of Mulch reduced them by 20%. Reduced drip irrigation frequency and mulching may provide an opportunity for suppressing N₂O emissions from drip-irrigated vineyards and orchards. There was alsolarge spatial variability of N₂O and CO₂ emissions with respect to distance relative to the apple tree and dripper locations. The emission factor (N emitted as N₂O per unit of total applied N) from the applied fertilizer (uncorrected for background emission) across all treatments averaged 2.8% in the vineyard and 2.4% in the orchard. The 1% default IPCC emission factor likely underestimates N₂O emissions from these systems.<br>Irving K. Barber School of Arts and Sciences (Okanagan)<br>Earth and Environmental Sciences, Department of (Okanagan)<br>Graduate

Thesis (Ph. D.)--Massachusetts Institute of Technology, Engineering Systems Division, Technology, Management, and Policy Program, 2006.<br>Includes bibliographical references.<br>Environmental regulations are typically portrayed as an outside force stimulating development of environmental technologies in regulated industries. In reality, firms influence regulation by communicating their technological progress, which helps form a basis for future standards. Because of differences in each firm's technological capability and environmental performance, regulations affect the competitive position of firms. Firms with advanced technologies stand to gain competitive benefit from more stringent environmental regulations, and may therefore choose to introduce a more costly but cleaner technology ahead of regulation. Such a competitive regulatory strategy has the potential to bring competitive benefits to the lead firm(s) and environmental benefits to the public. This research explains the conditions under which competitive regulatory strategies are pursued in the diesel vehicle and fuel industry. Growing public concern about the health effects of diesel exhaust has led countries to implement several cycles of increasingly stringent emission and fuel regulations over the past two decades.<br>(cont.) Taking a comparative case study approach, this work studies multiple regulatory cycles for light-duty vehicles, heavy-duty engines, and diesel fuel sulfur in the European Union, Japan, and the United States. For each region's regulatory cycles, cases of corporate behavior, including early adoption, first-mover behavior, and noncompliance, are identified and analyzed for their context, motivation, influence on regulatory policy, and public and private effects. Source material consists of documentary sources, descriptive statistics, and semi-structured interviews with experts. This methodology generates multiple cases for comparison across countries, cycles, sectors, and firms. While early- and first-mover behavior was observed in the regulatory cycles, firms do not aggressively pursue competitive regulatory strategies. They are guided by other motivations, such as fiscal incentives, diesel market share protection, and technology development/testing. A weak business case, risk aversion, industry pressure, and lack of supporting infrastructure pose strong disincentives.<br>(cont.) The final recommendations address issues pertinent to regulators, firms, and environmental groups: fiscal incentives as an effective means to encourage rapid technology adoption; environmental NGOs as a vehicle for communicating technological progress; use of technology demonstrations by lead firms to show regulatory readiness; and combination of short-term and long-term targets with mechanisms to encourage technology-based competition.<br>by Christine Bik-Kay Ng.<br>Ph.D.

This is a study on the conditions of collaborative learning in the context of UK ammonia emissions. By conducting an extensive review of over 40 scientific articles, this study identifies and synthesizes a list of nine conditions deemed necessary for successful collaborative learning processes and explores their extent and overall influence between three stakeholders involved in UK ammonia emissions. Hybrid focus group/key informant interviews provided the data for this exploration. This study suggests that the extent of these 9 conditions are present enough between the three stakeholders to initiate a collaborative learning process. By conducting further studies with a wider field of stakeholders, a collaborative learning process could identify possible ways to mitigate UK ammonia emissions.

As managers of extensive vehicle fleets and transportation infrastructures, public transit agencies present unique opportunities for reducing greenhouse gas (GHG) emissions from the transportation sector. To achieve substantial and cost-effective GHG emissions reductions from their activities, public transit agencies need tools and resources that enable effective GHG emissions management. This research thesis presents the background, methodology, and results of the author's development of a public transit agency-level life cycle GHG emissions calculator. The development of the calculator involved a series of research efforts aimed at identifying and addressing the needs of transit agency GHG emissions management: a review of background information on climate change and public transit's role in mitigating climate change; a review of existing GHG emissions calculators for public transit agencies, a review of the methodologies for life cycle GHG emissions analysis; integration and adaption of existing calculation resources; development of calculator spreadsheets for estimating relevant lifecycle GHG emissions and quantifying GHG emission reduction cost-effectiveness; application of the developed calculator to a carbon footprint analysis for a typical mid-size to large-size transit agency; and application of the developed calculator to the evaluation of the cost-effectiveness of various potential strategies for reducing transit agency GHG emissions. The developed calculator provides an integrative resource for quantifying GHG emissions and costs of public transit agency activities, including GHG emission reduction strategies. Further research is needed to calibrate the estimation of upstream life cycle GHG emissions, particularly for vehicle manufacture and maintenance.

Pour répondre à la demande de la population croissante, la production de riz doit être augmentée de 40% d’ici 2030. Cependant cette production émet des gaz à effet serre (GES), tel que le méthane (CH4), qui contribue au réchauffement climatique. Les stratégies de gestion, telles que le drainage des sols et la gestion durable des résidus, sont essentielles pour diminuer les émissions de GES des rizières, mais cela entrent souvent en conflit avec les pratiques de gestion des riziculteurs. L'objectif de ce projet était d'étudier le potentiel d'atténuation des GES par des pratiques de drainage et de gestion des résidus et par l’identification des opportunités et les contraintes auxquelles sont confrontés les petits exploitants dans la mise en œuvre des pratiques. Le projet a été élaboré en utilisant une approche interdisciplinaire incluant mésocosme en chambre climatique, des campagnes sur le terrain et une enquête après des agriculteurs au Vietnam. La première étude sur le mésocosme a été menée pour identifier l'impact du drainage en début et mi-saison sur les émissions de CH4 et de N2O par des sols amendés avec des résidus frais et compostés à différents niveaux de sol C (article I). La deuxième étude sur le mésocosme incluait des résidus de riz enrichis en 13C pour comprendre l'effet de la pré-plantation, d’un drainage précoce et à mi-saison sur la contribution des résidus C aux émissions de CH4 (article III). Des expériences de terrain ont été menées pendant deux saisons (printemps et été) pour documenter l'effet de la pré-plantation, du drainage en début et à mi-saison sur les émissions de CH4 et de N2O par des sols modifiés par l’apport de résidus dans deux systèmes de gestion d’eau: un système efficace de gestion de l'eau et un système de contrôle d'eau conventionnel (article II). Trente-cinq petits producteurs de riz ont été interviewés pour évaluer la diversité des pratiques de gestion des terres dans la région et comprendre leurs pratiques de culture, leurs défis et leurs contraintes à l'échelle de la rizière. Quatre ateliers ont été menés avec des agriculteurs, des conseillers agricoles locaux et régionaux pour concevoir et évaluer les pratiques de production de riz adaptées au climat, basées sur la gestion de l'eau et des résidus (article IV). Les études de laboratoire et de terrain ont montré que les pratiques de drainage (pré-plantation et drainage précoce) pouvaient atténuer les émissions de GES sans compromettre le rendement du riz. Au laboratoire, le drainage avant plantation a considérablement réduit les émissions de CH4 de 70 à 80%, alors que sur le terrain, le drainage se montre moins efficace dans la réduction des émissions de CH4 en raison des activités opérées par les agriculteurs avant transplantion. Dans l’étude de terrain, le drainage précoce et en mi-saison a diminué les émissions de CH4 de 67% et 43% dans les systèmes comprenant une gestion de l’eau efficaces et inefficaces. Au laboratoire, l’addition d’un drainage en début et mi-saison a réduit les émissions de CH4 de 75 à 90%. Sur le terrain, le système efficace de contrôle de l'eau associé avec une bonne aération des sols a considérablement augmenté le potentiel de diminution du CH4 des sols drainés et modifiés par les résidus. L'étude isotopique a indiqué que l'aération des sols au stade précoce (pré-plantation ou début de saison) réduit les émissions de CH4 dérivés des résidus de 57 à 87%. Cependant, les résultats ont mis en évidence que l’amélioration des pratiques de drainage impactaient très peu les émissions de N2O. Les résultats de l'étude participative ont souligné l'importance d'impliquer les agriculteurs et les acteurs locaux dans la conception des systèmes d'atténuation des GES. Ces résultats ont mis en évidence les contraintes et les opportunités possibles pour la mise en œuvre réussie des stratégies d'atténuation des GES dans les rizières des petits exploitants<br>Rice production needs to increase by 40% to meet the demand of the world’s growing population by 2030, yet rice production contribute to global warming with elevated GHG emissions, particularly of methane (CH4). Management strategies, such as drainage of paddy soils &amp; sustainable residue management are essential in order to mitigate GHG emission from rice systems, but they often conflict with the practical management preferences of rice farmers. The objective of this project was to investigate the GHG mitigation potential of drainage practices and residue management techniques, and to identify the constraints and opportunities faced by smallholders in the implementation of mitigation practices under local conditions. The project was formulated using an interdisciplinary approach that included two mesocosm studies in growth chamber, two field campaigns and a field survey of farmers in Vietnam. First mesocosm study was conducted to verify the impact of early season drainage and midseason drainage on CH4 and N2O emissions from fresh and composted residue-amended soils at different soil C levels (Paper I). Then second mesocosm study was conducted using 13C-enriched rice residue to understand the effect of pre-planting, early-season and midseason drainage on the residue carbon contribution to CH4 emissions (Paper III). Field experiments based on farmers’ field conditions were conducted for two seasons (spring and summer) to document the effect of pre-planting, early-season and midseason drainage on CH4 and N2O emissions from residue-amended soils under two field water management systems: an efficient field water control system and a conventional, inefficient field water control system (Paper II). Thirty-five smallholder rice farmers were interviewed to capture the diversity of different land management practices in the area and understand their cropping practices, challenges and constraints faced at field scale. Four workshops were conducted with farmers, local agricultural advisors and regional stakeholders to design and assess the climate-smart rice production practices, based on water and residue management (Paper IV). The lab and field studies showed that drainage practices (pre-planting and early season drainage) had the potential to mitigate GHG emissions without compromising rice yield. Pre-planting drainage greatly reduced CH4 emissions in the lab experiment by 70-80%, while in field condition pre-planting drainage had less effect on CH4 emission reduction due to constraints with farmers’ field operations before transplanting. Early season drainage reduced CH4 emissions in both lab and field experiments. In field study, early plus midseason drainage lowered the CH4 emissions by 67% and 43% in the efficient and inefficient field water management systems respectively. In lab, early plus midseason drainage lowered CH4 emissions by 75-90 %. The efficient field water control system and good soil aeration significantly increased the CH4 mitigation potential of the drainage regimes from residue-amended soils. The isotopic study in lab indicated that soil aeration in the early stage (pre-planting or early season) reduced the residue-derived CH4 emissions by 57-87%. The results highlighted that the effects of improved drainage practices on N2O emissions were very low when considering the total GHG effects of CH4 and N2O. The results of the participatory study highlighted the importance of involving farmers and local stakeholders in the process of designing the mitigating systems. The active involvement of farmers and local stakeholders in the process of designing, testing and assessing the water management systems highlighted the constraints and feasible options for successful implementation of GHG mitigation strategies in smallholders’ rice fields

<p> Adoption of nitrogen (N) management strategies to minimize gaseous N loss from agriculture while maintaining high yield production is increasingly important for an exponentially growing population. Agricultural management on poorly-drained claypan soils in the Midwestern U.S. make corn (<i> Zea mays</i> L.) production even more challenging due to the subsoil&rsquo;s low permeability, which may result in wetter soil conditions and relatively larger amounts of soil N₂O emissions during the growing season. The objective of this study was to determine the effects of urea fertilizer placement with and without the addition of a nitrification inhibitor (NI) on corn yield, N use efficiency (NUE), and cumulative soil N2O emissions on a Northeastern Missouri claypan soil. The fertilizer strategies utilized in this study consisted of deep-banded urea (DB) or urea plus nitrapyrin [2-chloro-6-(trichloromethyl) pyridine] (DB+NI) at a depth of 20 cm compared to urea broadcast surface applied (SA) or incorporated to a depth of 8 cm (IA). The addition of a NI with deep-banded urea resulted in 27% greater apparent N recovery efficiency than all other N treatments. Additionally, DB+NI had 54 and 55% lower cumulative soil N₂O emissions than IA and SA treatments in the two combined growing seasons. These results suggest that deep placement of urea with or without nitrapyrin is an effective management strategy for increasing corn yield and reducing N loss on a claypan soil.</p><p>

Intensive agriculture, coupled with an increase in nitrogen fertilizer use, has contributed significantly to the elevation of atmospheric greenhouse gases (GHGs), including carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). Rising GHG emissions usually mean a decrease in soil carbon. Currently, soil C is twice that of all standing crop biomass, making it an extremely important player in the C cycle. Fortunately, agricultural management practices have the potential to reduce agricultural GHG emissions whilst increasing soil C. Management practices that impact GHG emissions and soil C include various tillage practices, different N fertilization amounts and treatments (synthetic N, cattle manure, or a combination of both), the use of cover crops, aeration, and water levels. Employing agricultural best management practices (BMPs) can assist in the mitigation and sequestration of CO2, N2O and soil C. Measuring soil carbon storage and GHG emissions and using them as metrics to evaluate BMPs are vital in understanding agriculture's role in climate change. The objective of this research was to quantify soil carbon and CO2 and N2O emissions in agroecosystems (dairy, crop, and meat producing farms) under differing management practices. Three farms were selected for intensive GHG emissions sampling: Shelburne Farm in Shelburne, VT, a dairy in North Williston, VT, and Borderview Farm in Alburgh, VT. At each site, I collected data on GHG (CO2 and N2O) emissions and soil carbon and nitrogen storage to a depth of 1 meter. Soil emissions of CO2 and N2O were taken once every two weeks (on average) from June 2015 through November, 2015 using static flux chambers and a model 1412 Infrared Photoacoustic Spectroscopy (PAS) gas analyzer (Innova Air Tech Instruments, Ballerup, Denmark). Fluxes were measured on 17 dates at Shelburne Farms, 13 dates at the Williston site, and 13 dates in the MINT trial. Gas samples were taken at fixed intervals over a 10-14 minute time frame, with samples normally taken every one or two minutes. I also measured soil carbon to a depth of 1m in six BMPs at Borderview Farm. Overall, I found that manure injection increased N2O and CO2 emissions, but decreased soil C storage at depth. Tillage had little to no impact on N2O emissions, except at Shelburne Farms, where aeration tillage decreased N2O emissions (marginally significant, P < 0.1). No-till did, however, decrease CO2 emissions relative to other conservation tillage practices (strip and vertical tillage) but we were unable to detect a significant change in soil C due to tillage practices. At Borderview farm, N2O emissions increased with soil NO3 and soil moisture, while CO2 emissions increased with soil temperature and nitrate. At Williston, CO2 emissions only increased with temperature; at Shelburne CO2 emissions increased with nitrate. N2O fluxes at Shelburne and Williston were not associated with any of the measured covariates.

Recent scientific findings have generated considerable concern about the adverse effect of greenhouse gas (GHG) emissions on the world's climate in general and global warming in particular. In Canada and many other countries, this concern has led to the adoption of legal and political steps with the aim of curbing GHG emissions. The first part of this thesis describes the steps taken by Canada in this regard.<br>Such steps provide a strong incentive to Canadian power systems to incorporate reduction of GHG emissions in their planning process. Thus, in the second part of the thesis, a long-term supply mix planning model is developed. Since significant decrease in GHG emissions is unlikely to occur without removal of highly polluting power plants, this model allows for decommissioning these power plants.<br>Finally, the supply mix planning model is applied to evaluate the strategy of joint planning (as opposed to separate planning) of the power systems of Quebec and Ontario. Results obtained from the model leads to the conclusion that joint planning is preferable from the point of view of overall social and financial cost.

La regulación mundial de emisiones contaminantes en el sector de la automoción está siendo cada día más estricta. La implantación de nuevos procedimientos está presionando la industria hacia la búsqueda de nuevas tecnologías que cumplan los objetivos de reducción de emisiones contaminantes. En el medio plazo se espera que las pruebas de emisiones a baja temperatura ambiente sean obligatorias en el proceso de homologación. La combustión a bajas temperaturas influye de forma importante en la velocidad de la reacción conllevando un aumento de las emisiones y finalmente al apagado de llama. Bajo estas condiciones, se produce un aumento de las emisiones de hidrocarburos (HC) y monóxido de carbono (CO) así como un aumento del consumo de combustible. Además, en condiciones de baja temperatura ambiente las emisiones de óxidos de nitrógeno (NOx) pueden aumentar debido a la desactivación de los sistemas de recirculación de gases de escape. En la presente tesis, se ha analizado el efecto de la baja temperatura ambiente en un motor diesel HSDI. Los ensayos fueron realizados en ciclos de conducción NEDC y WLTC. La influencia directa de las bajas temperaturas en las emisiones se analizó por medio de las medida bruta de contaminantes, aguas arriba de los sistemas de postratamiento. El funcionamiento de los sistemas de postratamiento también fue evaluado a bajas temperaturas mediante la eficiencia de la oxidación catalítica de HC y CO. Los resultados de este estudio mostraron un deterioro de las emisiones y del rendimiento efectivo a bajas temperaturas. El efecto de las bajas temperaturas varió dependiendo de condiciones de carga. El ciclo NEDC se consolida como el peor escenario de conducción, para la realización de pruebas a baja temperatura, con un incremento del 270% en HC, 250% en NOx, 125% en CO y 20% en consumo específico. El mayor grado de carga junto con el carácter más transitorio del ciclo WLTC mostraron un efecto menor de las bajas temperaturas ambiente con un aumento del 150% en HC y 250% en NOx. A diferencia del ciclo NEDC, las emisiones de CO se redujeron en un 20% y no se detectó un aumento del consumo de combustible. Además del aumento de la formación de contaminates, el análisis del catalizador de oxidación mostró una reducción de la eficiencia en ambos ciclos de conducción NEDC y WLTC. El presente trabajo tiene por objetivo comparar dos sistemas de gestión térmica para la mejora del funcionamiento de MCIA a bajas temperaturas. El primer sistema estaba basado en la gestión del flujo de refrigerante para evitar subenfriamiento en condiciones de funcionamiento en frío. Por un lado, se propusieron estrategias de bajo y nulo flujo en el circuito de refrigerante motor. Por otro lado, se realizaron ensayos con 0 flujo en el circuito de refrigerante del WCAC para evitar el subenfriamiento del aire de admisión durante puntos de baja carga en condiciones de funcionamiento en frío. El otro sistema incluía la recuperación de energía térmica del escape (EGHR). El refrigerante del WCAC se empleó como fluido de recuperación conectándose con un intercambiador de escape. La primera parte de los resultados de la gestión térmica están centrados en el análisis individual de los distintos sistemas de gestión. En las conclusiones se comparan todos los sistemas propuestas explicando las diferencias entre ellos. Mediante el uso del EGHR las emisiones de HC fueron reducidas, durante los puntos de baja carga, en comparación con el resto de estrategias térmicas planteadas. El análisis energético del EGHR se centró en la eficiencia y en el estudio la recuperación por cambio de fase. El papel que la entalpia de cambio de fase juega en la recuperación de calor residual fue estudiado por medio de la medición de concentración de vapor de agua en el gas de escape en la entrada y salida del intercambiador del EGHR. La condensación del vapor de agua de escape representó el 25% de toda la<br>Automotive world-wide pollutant emissions regulations are getting more stringent every day. New testing procedures are pushing the automotive industry towards researching new technologies to accomplish the emissions targets. In the mid-term future is expected that low ambient temperature emissions testing will become mandatory for any engine model type approval. Low ignition temperature greatly influences on combustion rate leading to emissions increase and eventually to misfiring events. In these conditions, high emissions of unburned hydrocarbon (HC) and carbon monoxide (CO) are released along with fuel consumption penalties. In addition, nitrogen oxides (NOx) emissions may rise under cold conditions owing to the disabling of Exhaust Gas Recirculation (EGR) systems at cold conditions. In this thesis the effect of low ambient temperature in a High Speed Direct Injection (HSDI) Light Duty (LD) engine is analysed. Tests were performed in New European Driving Cycles (NEDC) and Worldwide harmonized Light vehicles Tests (WLTC). Direct influence of low temperature on engine emissions was addressed by engine out pollutants sampling. The effect on aftertreatment systems was also evaluated by the CO and HC oxidation efficiency. The results of this survey indicated a general detriment of pollutant emissions and brake thermal efficiency at low ambient temperatures. The effect of low temperature varied depending on the engine load test conditions. NEDC comes up as the worst scenario for low temperature testing with an increase of 270% in HC, 250% in NOx, 125% in CO and 20% in Brake Specific Fuel Consumption (BSFC). Running at higher engine loads and transient conditions, as it's performed in WLTC tests, showed a lower effect of ambient temperature with an increase of 150% in HC and 250% in NOx. In contrast to NEDC, CO emissions were reduced in 20% and no engine efficiency penalty was spotted. In addition to the pollutant emission formation increase, the aftertreatment analysis showed a significant reduction of the Diesel Oxidative Catalyst (DOC) efficiency in both NEDC and WLTC. This work is aimed to analyse and compare two different thermal management approaches for engine enhancement running at low ambient temperature. The first approach relied on coolant management aimed to avoid overcooling when running at cold conditions. On one hand, low flow and 0 flow engine coolant strategies were performed while Water Charge Air Cooled (WCAC) coolant is recirculated. On the other hand, WCAC 0 flow was applied for avoiding overcooling at low ambient temperatures. The other layout was based on an exhaust gas heat recovery system (EGHR). WCAC coolant was directed to an exhaust tail pipe heat exchanger for waste heat recovery. Recovered heat was released in the WCAC for speeding up the intake air temperature increase. The first part of the thermal management results is focused on the analysis by thermal layout. Comparison of both thermal management is discussed in the conclusions section of that chapter. By enabling an EGHR system, HC emissions were reduced during low load driving phases in comparison with the other of layouts. EGHR energy analysis was also conducted, focusing on energy efficiency and phase change recovery analysis. The role that latent enthalpy plays on waste heat recovery was addressed by measuring the water vapour concentration in the exhaust stream at both EGHR heat exchanger inlet and outlet. Water vapour condensation represented the 25% of the total recovered energy.<br>La regulació mundial d'emissions contaminants en el sector de l'automoció està sent cada vegada més estricta. La implantació de nous procediments està pressionant la indústria cap a la cerca de noves tecnologies que complisquen els objectius de reducció d'emissions contaminants. En el mig termini s'espera que les proves d'emissions a baixa temperatura ambient siguen obligatòries en el procés d'homologació. La combustió a baixes temperatures influeix de forma important en la velocitat de la reacció comportant un augment de les emissions i finalment a l'apagat de flama. Sota aquestes condicions, es produeix un augment de les emissions d'hidrocarburs (HC) i monòxid de carboni (CO) així com un augment del consum de combustible. A més, en condicions de baixa temperatura ambiente les emissions d'òxids de nitrogen (NOx) poden augmentar a causa de la desactivació dels sistemes de recirculació de gasos d'escapament. En la present tesi, s'ha analitzat l'efecte de la baixa temperatura ambiente en un motor dièsel HSDI. Els assajos van ser realitzats en cicles de conducció NEDC i WLTC. La influència directa de les baixes temperatures en les emissions es va analitzar per mitjà de la mesura bruta de contaminants, aigües a dalt dels sistemes de postractament. El funcionament dels sistemes de postractament també va ser avaluat a baixes temperatures mitjançant l'eficiència de la oxidació catalítica de HC i CO. Els resultats d'aquest estudi van mostrar una deterioració de les emissions i del rendiment efectiu a baixes temperatures. L'efecte de les baixes temperatures variava depenent de les condicions de càrrega. El cicle NEDC es consolida com el pitjor escenari de conducció, per a la realització de proves a baixa temperatura, amb un increment del 270% en HC, 250% en NOx, 125% en CO i 20% en consum específic. El major grau de càrrega juntament amb el caràcter més transitori del cicle WLTC van mostrar un efecte menor de les baixes temperatures ambient amb un augment del 150% en HC i 250% en NOx. A diferència del cicle NEDC, les emissions de CO es van reduir en un 20% i no es va detectar un augment del consum de combustible. A més de l'augment de la formació de contaminants, l'anàlisi del catalitzador d' oxidació va mostrar una reducció de l'eficiència en tots dos cicles de conducció NEDC i WLTC. El present treball té per objectiu comparar dos sistemes de gestió tèrmica per a la millora del funcionament dels MCIA a baixes temperatures. El primer sistema estava basat en la gestió del flux de refrigerant per a evitar subrefredament en condicions de funcionament en fred. D'una banda, es van proposar estratègies de baix i nul flux en el circuit de refrigerant motor. D'altra banda, es van realitzar assajos amb 0 flux en el circuit de refrigerant del WCAC per a evitar el subrefredament de l'aire d'admissió durant punts de baixa càrrega en condicions de funcionament en fred. L'altre sistema incloïa la recuperació d'energia tèrmica de l'escapament (EGHR). El refrigerant del WCAC es va emprar com fluït de recuperació connectant-se amb un bescanviador d'escapament. La primera part dels resultats de la gestió tèrmica estan centrats en l'anàlisi individual dels diferents sistemes de gestió. En les conclusions es comparen tots els sistemes proposats explicant les diferències entre ells. Mitjançant l'ús del EGHR les emissions de HC van ser reduïdes, durant els punts de baixa càrrega, en comparació de la resta d'estratègies tèrmiques plantejades. L'anàlisi energètic del EGHR es va centrar en l'eficiència i en l'estudi de la recuperació per canvi de fase. El paper que l'entalpia de canvi de fase juga en la recuperació de calor residual va ser estudiat per mitjà del mesurament de concentració de vapor d'aigua en el gas d'escapament en l'entrada i eixida del bescanviador del EGHR. La condensació del vapor d'aigua de l'escapament va representar el 25% de tota l'energia recuperada.<br>Moratal Martínez, AA. (2018). EXPERIMENTAL ANALYSIS OF THERMAL MANAGEMENT INFLUENCE ON PERFORMANCE AND EMISSIONS IN DIESEL ENGINES AT LOW AMBIENT TEMPERATURE [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/111950<br>TESIS

Doctor of Philosophy<br>Department of Horticulture and Natural Resources<br>Dale J. Bremer<br>Turfgrasses sequester and emit carbon dioxide, and emit nitrous oxide (N₂O) when fertilized with nitrogen and irrigated. Future water availability is a serious issue and drought restrictions may be imposed on turf managers while turf areas are subjected to traffic stress. My objectives in Chapter 2 were to: 1) quantify the magnitude and patterns of N₂O emissions and carbon (C) sequestration in zoysiagrass (Zoysia japonica Steud.); and 2) determine how irrigation (66% and 33% reference evapotranspiration [ET₀] replacement) and fertilization (polymer-coated urea, urea, and unfertilized) management may reduce N₂O emissions and enhance carbon sequestration. My objectives in Chapters 3 and 4 were to evaluate above- and below-ground responses of cool-season (C3) [Kentucky bluegrass (Poa pratensis L.) and perennial ryegrass (Lolium perenne L.)] and warm-season (C4) grasses {buffalograss [Buchloe dactyloides (Nutt.) Engelm] and zoysiagrass] at golf course-related mowing heights [1.6-cm (fairway) and 6.4-cm (rough)], with and without traffic during a simulated drought and subsequent recovery period (without traffic). In Chapter 2, N₂O emissions increased by 6.3% with more irrigation during summers and increased from 4.06 kg ha⁻¹ in unfertilized turf to 4.50, and 5.62 kg ha⁻¹ in polymer-coated urea and urea treated turf, respectively, during the 2-year study. There was no difference in C sequestration rates between a high vs. low input management schedule. The C sequestration rate was 0.952 Mg C ha⁻¹ yr⁻¹ for zoysiagrass when averaged across management schedules and depths. The use of a controlled-release fertilizer such as PCU compared to the use of a quick-release fertilizer and/or lower irrigation will reduce N₂O emissions in turfgrass. In Chapters 3 and 4, the better drought tolerance of C4 grasses led to more differences between traffic treatments within C4 than C3 grasses, but C4 grasses maintained the highest quality and green cover. Quality at rough- compared to fairway-height was more impacted by traffic. Decreasing soil moisture due to drought led to a minimal impact from traffic on soil bulk density, soil penetration resistance (SPR), and root measurements. During drought, SPR at deeper soil depths and fairway plots increased and exceeded the critical value of 2.0 MPa. Both C4 grasses and perennial ryegrass had larger root diameters, which may have led to better soil compaction resistance. Traffic during drought will have a negative and accelerated impacts above-ground, but minimal impact below-ground, which will vary with turf species and mowing height.

In this study, carbon dioxide emissions resulting from transportation are assessed, carbon emission reduction opportunities in the current service supply chain design of Cisco Systems, Inc. are explored. Among these opportunities, changing transport mode from a high-carbon transport mode to a low-carbon transport mode is found to be the most promising option and is scrutinized. The effect of transportation mode change on carbon emission and expected total cost are scrutinized by developing a mathematical model that minimizes expected total cost subject to aggregate fill rate constraint. Furthermore, a second model that minimizes the expected total cost under aggregate expected fill rate and carbon emission constraints is developed. In this model transportation mode choice decisions are integrated into inventory decisions. Since it is difficult to make transportation mode selection for each individual item, the items are clustered and transportation mode selection is made for each cluster. Therefore we propose two clustering methods that are k-means clustering and an adopted ABC analysis. In addition, a greedy algorithm based on second model is developed. Since currently there are no regulations on carbon emissions, in order to examine possible regulation scenarios computational studies are carried out. In these studies, efficient solutions are generated and the most preferred solutions that have less carbon emission and lower total cost among all efficient solutions are examined.

The aim of the paper: to investigate the effect of microclimatic factors on the process of ammonia emission from manure, and evaluate possibilities to reduce ammonia emission from cowsheds by controlling these factors. The completed analysis of microclimatic factors in various naturally ventilated cowsheds revealed patterns of variation in ammonia concentration depending on air temperature in the barn. While analysing the process of ammonia evaporation from the manure, the effect of interacting environmental factors on the intensity of evaporation was evaluated. The effect of temperature, ventilation intensity and drying of manure surface on the intensity of ammonia evaporation process from manure was determined and proved. Theoretical and experimental presumptions were made for the investigation of the effect of the crust formation at the manure surface on ammonia diffusion process. Based on the obtained results, ammonia emission from naturally ventilated cowsheds with various engineering solutions can be predicted, and equipment reducing the ammonia emission from them can be installed.<br>Darbo tikslas ˗ Ištirti mikroklimato veiksnių įtaką amoniako emisijos procesui iš mėšlo ir įvertinti galimybes juos valdant sumažinti amoniako emisiją iš karvidžių. Ištyrus mikroklimato veiksnius įvairiose natūraliai vėdinamose karvidėse, nustatyti amoniako koncentracijos kaitos dėsningumai priklausomai nuo oro temperatūros tvarte. Analizuojant amoniako garavimo iš mėšlo procesą, įvertinta tarpusavyje sąveikaujančių aplinkos veiksnių komplekso įtaka garavimo intensyvumui. Nustatyta ir įrodyta temperatūros, vėdinimo intensyvumo ir mėšlo paviršiaus džiūvimo įtaka amoniako garavimo iš mėšlo proceso intensyvumui. Sukurtos teorinės ir eksperimentinės prielaidos tirti mėšlo paviršiuje besiformuojančios plutos įtaką amoniako difuzijos procesui. Pagal gautus rezultatus galima prognozuoti amoniako emisiją iš natūraliai vėdinamų karvidžių su įvairiais inžineriniais sprendimais ir diegti priemones mažinančias amoniako emisiją iš jų.

Emission trading is a tool for achieving the European commitment to reduce greenhouse gas emissions. The aim is to create an effective European emissions trading market with the least possible negative impact on economic development and employment within the Union. Waste incineration plants in Sweden were added into this systemin2013andthe general situation has been a non-functioning market with a surplus of allowances where the emission cap was not tight enough to drive a significant reduction in emissions. For the upcoming trading period starting 2021 the cost for emission allowances is expected to increase due to the reformation, and the challenge is to allocate the cost for allowances in a fair and sustainable manner. The aim of this thesis is to present options on how to allocate the cost for emission allowances related to waste incineration plants with energy recovery in Sweden. The aim is further to understand how the cost allocation can result in a decrease of CO2emissions and thereby a lower climate impact. The initial idea for the research topic was proposed by the case study company and further developed in conjunction with the author, supervisor and examiner. The research is based on a case study of Tekniska Verken AB, an energy recovery company in Sweden. A case study approach was chosen as the research questions focuses on investigating a contemporary phenomenon within a real-life context. Data collection consisted of a literature review, semi-structured interviews and field visits, where the interviews were the main source of data for this research. The overall understanding is that the cost for emission allowances should be allocated further up the waste supply chain, all the way to product producers. By allocating the cost to waste providers by increased waste incineration treatment-price, the cost is pushed one step upstream. In this case, differentiating the waste providers by divide them into categories(such as municipal waste for example)and allocate the cost for emission allowances based on the performance of each category is a realistic and feasible solution aiming upstream. The cost can be allocated differently among waste providers depending on which category the waste derives from or on an overall level, tentatively using radiocarbon method. The radiocarbon method is considered reliable and practical to use compared to other options. Adopting polluters pay principle identifies the polluters and by allocating the cost for emitting carbon towards them plants an incentive to improve sorting and to decrease the share of fossil content. This can eventually contribute to a lower impact.

The Oil and Gas (O&amp;G) Industry has been one of the most environmentally questioned sectors in the lastdecades, where the management of the resources and impact over natural life has been severelycriticized. There are many adverse effects of the activities around the O&amp;G business, from which theconsumption of energy and the emissions of Greenhouse Gases (GHG) stand out to be one of the mostimportant aspects to mitigate. This project studies the actual EnMS in E&amp;P and develops measures of improvement using establishedmanagement tools in the division, applying the principles of the ISO 50001 Standard, to include energysavings and GHG emissions mitigation in the lifecycle of Repsol’s E&amp;P operated assets. The main focuslands over three core elements: the Integrated Project Management platform for new projects, the EnergyPlanning follow-up applications, and the implementation of relevant energy audit outlines.