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Dissertations / Theses on the topic 'Volatile fatty acids'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Abouzreba, Salem Ali. "Volatile fatty acids in the ambient atmosphere." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388115.

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2

Ghimire, Sandip. "Volatile Fatty Acid Production in Ruminants." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/75306.

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Volatile fatty acids (VFA) are important products of ruminal fermentation. The VFA are not only the major source of energy to the ruminant animals but also influence methane production in the rumen. Therefore it is important to understand mechanism controlling VFA production and to depict VFA production in a model. This will allow us to devise strategies to enhance energy utilization and reduce methane production in ruminant livestock. An evaluation of a mechanistic model in predicting VFA production was conducted and equations were introduced into the model to improve the predictions. Later a

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3

Caunt, P. "Degradation of volatile fatty acids by immobilised bacteria." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233711.

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The aims of this project were to study the immobilisation of microorganisms and the use of immobilised cell preparations in biochemical reactors. One particular process, the biodegradation of volatile fatty acids (VFAs), was chosen as a model system. Volatile fatty acids are compounds which are commonly found in odorous wastes and so can present a pollution problem. A bacterium was isolated, which was capable of VFA degradation in a minimal medium. The organism was identified as a strain of Alcaligenes denitrificans. The strain was able to grow on, and degrade, individual straight chain VFAs a

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4

Ganesan, Balasubramanian. "Catabolism of Amino acids to Volatile Fatty Acids by Lactococcus lactis." DigitalCommons@USU, 2005. https://digitalcommons.usu.edu/etd/5509.

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Lactic acid bacteria are essential as flavor producers of cheese and fermented products. They are capable of catabolizing aromatic, branched chain, and sulfur amino acids to flavor compounds. During cheese ripening the numbers of lactococcal colonies decrease, but lactococci survive without replication in culture. This prompted an investigation into possible mechanisms of catabolism of branched chain amino acids into branched chain fatty acids and the physiological relevance of amino acid catabolism to the bacteria. We hypothesized that lactococci catabolize branched chain amino acids to branc

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5

Long, Jennifer Erin. "Optimization of volatile fatty acids production in full-scale fermenters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0018/MQ48064.pdf.

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6

Passanha, Pearl. "Improved polyhydroxyalkanoate production from selected volatile fatty acids using Cupriavidus necator." Thesis, University of South Wales, 2014. https://pure.southwales.ac.uk/en/studentthesis/improved-polyhydroxyalkanoate-production-from-selected-volatile-fatty-acids-using-cupriavidus-necator(18bc71e1-1514-4c4c-afe7-8d53ff23b0a1).html.

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This study aimed to develop methods to improve PHA production from selected volatile fatty acids (VFAs) and to improve the understanding of the PHA production process by pure culture bacterial fermentation using Cupriavidus necator. Optimisation strategies involved the following investigations using shake flasks and 5 litre based batch fermentations: Shake flask investigations determined that the temperature of 30oC and a nutrient medium, resulted in the highest growth of bacteria. A feeding strategy of the substrate (VFAs - acetic acid and butyric acid) was developed to avoid inhibition by th

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7

McPeak, David W. (David William). "The behavior of volatile fatty acids in model solutions during freeze-drying /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65359.

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8

Teiseh, Eliasu Azinyui. "Anaerobic hydrogen production by photosynthetic purplenonsulfur [sic] bacteria using volatile fatty acids." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1594490411&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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9

Chakraborty, Sagar Ph D. Massachusetts Institute of Technology. "Exploring volatile fatty acids (VFAs) as a novel substrate for microbial oil production." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98701.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Cost effective production of biofuels depends critically on feedstock cost and availability. As such, volatile fatty acids (VFAs) can play an important role in advancing sustainable biofuel production since they can be derived from low cost feedstock including gases and municipal solid waste. To this end, we studied fermentations of the oleaginous microbe Yarrowia lipolytica engineered for lipid overproduction. With

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10

Abegg, Richard. "Volatile fatty acids in digesta samples of cows with spontaneous cecal dilatation/dislocation /." [S.l.] : [s.n.], 1998. http://www.stub.unibe.ch/html/haupt/datenbanken/diss/bestell.html.

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11

McDougall, Forbes Russell. "Optimization and evaluation of the acidification stage of a two-phase anaerobic digester treating coffee wastewater." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318254.

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12

Copelin, Jacob E. "Effects of supplemental 2-hydroxy-(4-methylthio) butanoic acid and branched chain volatile fatty acids in lactating dairy cows." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu157487131308709.

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13

Atiq, Omar. "Feasibility of membrane processes for Volatile Fatty Acids (VFAs) concentration:data elaboration, modelling and design." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The need for recovery and concentrate a Volatile Fatty Acids (VFAs) effluent resulting from a biological fermentation step, has aimed a feasibility study on pressure-driven membrane separation processing. A previous experimental campaign, carried out at LABIC-DICAM for the NoAW (No-Agricultural Waste) EU project, involving total recirculation and concentration trials on RO and NF modules, was the starting point for subsequent elaboration, modelling, simulation and preliminary design. The presented mass transfer-solution modelling allowed the estimation of both VFAs and Na+ real rejections fo

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Malcom, Annie, Kaitlyn Webb, and W. Andrew Clark. "Profile of Volatile Fatty Acids in The Feces Of Normal And Overweight College Students." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/2512.

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15

Sydney, Eduardo Bittencourt. "Valorization of vinasse as broth for biological hydrogen and volatile fatty acids production by means of anaerobic bacteria." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00914329.

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Vinasse is the liquid waste removed from the base of sugarcane ethanol distillation columns at a ratio of 12-15 liters per liter of alcohol, resulting in an estimated production of approx. 350 billion liters in 2012/2013 in Brazil. Vinasse has a low pH and high chemical oxygen demand, which can cause land desertification when indiscriminately used as fertilizer. Also, underground water contamination is being observed in some regions. We evaluated the potential of vinasse as nutrient source for biohydrogen and volatile fatty acids production by means of anaerobic consortia. Two different vinass

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Turkmenoglu, Secil. "Organic Acids Production From Cheese-whey." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607709/index.pdf.

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In this study, production of organic acids from cheese-whey was studied. Optimization of organic acids production was performed in semi-batch and batch reactors. Two sets of experiments were performed. First set of experiments were performed in semi-batch reactors for the optimization of organic loading rate (OLR) and hydraulic retention time (HRT). As a result of Set 1 experiments optimum OLR was found to be 15 g COD l-1. Second set of experiments were performed in batch reactors by using the optimum OLR found in Set 1 experiments. Set 2 experiments were conducted to study the effect of using

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He, Xuan (Sarah). "The use of naturally generated volatile fatty acids for pesticide removal during the denitrification process." Thesis, University of Canterbury. Civil Engineering, 2006. http://hdl.handle.net/10092/1169.

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The effect of naturally produced volatile fatty acids (VFAs) on the removal of 2, 4-D from a wastewater during the denitrification process was studied in this thesis. The VFAs were generated from an anaerobic digester using soya flour solution as a synthetic feed. The digester was operated at an SRT and HRT of 10 days. The pH (4.8 ± 0.2) and temperature (32 ± 3 ℃) of the digester were not controlled. A mean VFA concentration of 3153 ± 801 mg/L was achieved with acid speciation results of acetic (51.4 %), propionic (27.5 %), n-butyric (19.6 %) and iso-valeric (1.4 %). The specific VFA productio

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18

Smith, Darron Louis. "The effect and mechanism of action of volatile fatty acids on the catabolism of progesterone." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4243.

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Thesis (Ph. D.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains x, 88 p. : ill. Vita. Includes abstract. Includes bibliographical references.

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19

Roman-Garcia, Yairanex. "Assessing Dietary Conditions Influencing the Requirements by Rumen Bacteria for Branched Chain Volatile Fatty Acids." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1557171743925883.

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20

Alshwan, Zahraa, and Simon Hultman. "Production of volatile fatty acids from anaerobic digestion using food waste, sludge and cow manure." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-21642.

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Volatile fatty acids (VFAs) are important building blocks for the chemical industry. These acids can be produced through environmentally friendly processes from a variety of wastes, such as food waste, sludge and cow manure, through anaerobic digestion (AD). The main objective of this thesis was to investigate which operating parameters (e.g. pH, retention time, mix of substrate etc.) are optimal for producing VFAs as efficiently as possible, through AD batch processes. The highest VFA concentration was reached at pH 10 and at day 11 when food waste and sludge were used as substrate to a value

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21

Liu, Hung-Jyh. "Volatile fatty acid and formic acid metabolism in sheep : a thesis submitted to the University of Adelaide in fulfilment of the requirements for the degree of Master of Agricultural Science." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09A/09al783.pdf.

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Includes bibliographical references (leaves 59-79) Examines the metabolism of volatile fatty acid and formic acid in fed sheep. Develops a method for analysing and qualifying volatile fatty acids with special reference to formic acid in biological fluids by High-Performance Liquid Chromatography.

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Gupta, Ashok Kumar. "The effects of temperature, pH and retention time on volatile fatty acids production from primary sludge." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26292.

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A typical biological phosphorus removal process consists of alternate anaerobic and aerobic zones. Recent research at the University of British Columbia (UBC) has indicated that the addition of volatile fatty acids (VFA's) to the anaerobic zone of Bio-P processes improves the overall phosphorus removal efficiency, at least when treating weak sewage. At the full-scale biological phosphorus removal plant at Kelowna, B.C., and at a pilot-scale facility at UBC, anaerobic fermentation of primary sludge has been used to produce VFA's to add to the anaerobic zone of these processes. The primary obje

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Chail, Arkopriya. "Effects of Beef Finishing Diets and Muscle Type on Meat Quality, Fatty Acids and Volatile Compounds." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4479.

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Consumer evaluation, proximate data, Warner-Bratzler shear force (WBSF), fatty acid (FA) composition and volatile compounds were analyzed from the Longissimus thoracis (LT), Tricep brachii (TB) and Gluteus medius (GM) muscles finished on conventional feedlot (FL) and forages, including a perennial legume, birdsfoot trefoil (BFT; Lotus corniculatus), and a grass, meadow brome (Bromus riparius Rehmann, Grass). Representative retail forage (USDA Certified Organic Grass-fed, COGF) and conventional beef (USDA Top Choice, TC) were investigated (n = 6) for LT. Additionally, the effects of diet on Glu

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Pan, Chengyang. "Application of volatile fatty acids from waste as an external carbon source for the denitrification process." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264538.

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The gap between resource demand for the industrialized world and non-renewable feedstock like fossil fuels, essential agricultural fertilizer is getting increasingly severe, which has resulted in alarming-increasingly impacts on worldwide environmental problems. Meanwhile, wastewater treatment plants (WWTPs), as an essential facility for urbanization, is also confronting new rising challenges such as energy consumption and operation costs rather than only improving effluent wastewater quality. It is thereby important to develop new approaches for next-generation WWTPs with less energy consumpt

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Restrepo, P. Ricardo J. "Dry matter digestibility and VFA production of selected feedstuffs using RUSITEC /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901273.

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26

Bendada, Domingos Joana Margarida <1988&gt. "Development of Biorefinery Schemes for the Production and Recovery of Volatile Fatty Acids from Agro-Industrial Wastes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/8035/11/BendadaDomingos_JoanaMargarida_tesi.pdf.

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Volatile fatty acid (VFAs) represent the final product of anaerobic acidogenic fermentation and can be exploited as precursors for the production of added-value chemicals. The biotechnological conversion of agro-industrial wastes into VFAs can be considered a valuable alternative to waste disposal. However, the productivity of processes, which refer to the carboxylation platform are affected by the purity of produced VFAs. Biosphere SRL (Forli, Italy) had started to valorize wastes to obtain biogas. VFAs were produced using maize silage (MS), vegetable waste (VW) and cheese whey (CW) as feed

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27

Pessiot, Jérémy. "Développement d'une unité pilote de bioraffinerie permettant la mixogenèse en continu à partir de la biomasse non alimentaire via la fermentation anaérobie mésophile." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22524.

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Les réserves de pétrole sont sur le déclin, les prix des ressources fossiles fluctuent et le CO 2 dégagé par leur consommation contribue inéluctablement au réchauffement climatique. Ce phénomène, conduit notre société vers l'utilisation accrue de biomasse pour la génération d'énergie, de composés chimiques et de matériaux. La réduction des déchets est considérée comme indissociable de cette transition énergétique et en opposition aux préjugés, l’accroissement des déchets organiques peut être bénéfique dans cette recherche de solutions alternatives. En effet, cela conduit à la génération de gra

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Bertrand, Martin. "Suivi de l'ATP et des protéines du biofilm dans un bioréacteur a lit fluidisé fermentant un perméat de lactosérum reconstitué /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2002. http://theses.uqac.ca.

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Beligon, Vanessa. "Valorisation d'acides gras volatils issus de fermentation anaérobie par la production de lipides microbiens, précurseurs de biodiesel." Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22687/document.

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Une part importante de la production mondiale de vecteurs énergétiques et de produits chimiques provient de la raffinerie de combustibles fossiles. En raison de l'augmentation du prix du pétrole et de son impact environnemental, la recherche de solutions alternatives, écologiques et économiques constitue l’un des enjeux de notre siècle. Le remplacement du pétrole par de la biomasse en tant que matière première pour la production de carburants et de produits chimiques constitue la force motrice dans le développement de complexes de bioraffinerie.Cette étude fait partie d’un projet de bioraffine

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Beckett, Linda Marie. "Effects of ruminal nutrient degradability on volatile fatty acid dynamics, ruminal epithelial gene expression, and post-absorptive system." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/87471.

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This study evaluated degradable nutrient supply effects on VFA concentrations, fluid flux and pool sizes, rumen epithelial metabolic and absorptive genes, and post-absorptive muscle and blood responses. Six ruminally cannulated Holstein heifers (BW=330 ± 11.3 kg) were used in a partially replicated Latin Square experiment with four treatments consisting of beet pulp or timothy hay and barley or corn grain. Periods were18 d with 3 d diet adaptation and 15 d of treatment. During each period, d 10 to 14 was used for in situ nutrient degradation assessment, d 16 to 18 was used for rumen fluid samp

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Steil, Lara. "Avaliação do uso de inóculos na biodigestão anaeróbia de resíduos de aves de postura, frangos de corte e suínos /." Araraquara : [s.n.], 2001. http://hdl.handle.net/11449/88047.

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Resumo: Investigou-se a influência da utilização de inóculos sobre a digestão anaeróbia de resíduos de aves de postura, frangos de corte e suínos em biodigestores modelo batelada com volume útil de 60 L operados à temperatura ambiente, por meio da caracterização do potencial e distribuição da produção de biogás ao longo do tempo, o estudo da redução de sólidos, a análise das características dos efluentes quanto à concentração de ácidos graxos voláteis e por meio da determinação do número mais provável (NMP) de coliformes fecais e totais nos afluentes e efluentes. Avaliou-se também a atividade

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Cersosimo, Laura M., Melissa L. Bainbridge, Jana Kraft, and André-Denis G. Wright. "Influence of periparturient and postpartum diets on rumen methanogen communities in three breeds of primiparous dairy cows." BIOMED CENTRAL LTD, 2016. http://hdl.handle.net/10150/614742.

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Background: Enteric methane from rumen methanogens is responsible for 25.9 % of total methane emissions in the United States. Rumen methanogens also contribute to decreased animal feed efficiency. For methane mitigation strategies to be successful, it is important to establish which factors influence the rumen methanogen community and rumen volatile fatty acids (VFA). In the present study, we used next-generation sequencing to determine if dairy breed and/or days in milk (DIM) (high-fiber periparturient versus high-starch postpartum diets) affect the rumen environment and methanogen community

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Li, Shihhui. "Angiopoietin-like protein 4 in bovine physiology." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/13107.

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Master of Science<br>Department of Animal Sciences and Industry<br>Barry Bradford<br>Angiopoietin-like protein 4 (ANGPTL4) is a 55-kDa secreted glycoprotein which is an important factor for regulation of energy and lipid metabolism. Plasma ANGPTL4 has the ability to inhibit lipoprotein lipase (LPL) function by preventing it from catalyzing hydrolysis of lipoprotein triglyceride, which contributes to ANGPTL4’s ability to decrease fat storage. Furthermore, research in mice suggests that gut microbes suppress gastrointestinal ANGPTL4 production, and that decreased plasma ANGPTL4 concentrations pr

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Pietrzyk, Julian Darius. "Use of microbial consortia for conversion of biomass pyrolysis liquids into value-added products." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31562.

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Lignocellulosic biomasses are considered promising feedstocks for the next generation of biofuels and chemicals; however, the recalcitrance of lignocellulose remains a barrier to its utilisation over conventional sources. Pyrolysis is the heating of biomass to several hundred degrees Celsius in the absence of oxygen, which can thermally depolymerise lignocellulose. Products of pyrolysis are a solid biochar, liquid bio-oil and syngas. Biochar has roles in both carbon sequestration and soil amendment however bio-oil has no defined use, despite a high concentration of fermentable sugars. Bio-oil

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White, Mallory Beth. "In ovo and feed application of probiotics or synbiotics and response of broiler chicks to post-hatch necrotic enteritis." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103632.

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Immediately post-hatch, broiler chicks are exposed to microbes that begin colonizing the gut, including environmental pathogens. One of the costliest enteric diseases in broiler production is necrotic enteritis (NE), caused by the ubiquitous opportunistic bacteria Clostridium perfringens (CP). With the worldwide reduction in antibiotic growth-promoters (AGPs), there is increased interest in natural alternatives to reduce disease and improve broiler health. The overall objective of the studies described herein was to apply probiotics or synbiotics to birds by in ovo application or orally before

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McMurphy, Casey Paul. "Effects of Humic/Fulvic Acid on Rumen Fermentation in Holstein Steers." Thesis, The University of Arizona, 2007. http://hdl.handle.net/10150/193335.

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Six ruminally fistulated steers (average BW 317 kg) were used in a 5 X 5 + 1 Latin Square design to determine effects of humic/fulvic acid (HFA) on serum urea nitrogen (SUN), rumen pH, rumen ammonia nitrogen (RAN), and rumen VFA production in Holstein steers. Treatments included a control (0%), 0.5, 1.0 or 1.5% HFA, and a diet containing monensin (33 mg/kg). A quadratic feed intake response was observed; with intake lowest for 0.5 and 1.0 and highest for 1.5 relative to control steers. No treatment x time interaction was observed for RAN, pH, SUN, total VFA or individual VFA. No treatment d

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Steil, Lara [UNESP]. "Avaliação do uso de inóculos na biodigestão anaeróbia de resíduos de aves de postura, frangos de corte e suínos." Universidade Estadual Paulista (UNESP), 2001. http://hdl.handle.net/11449/88047.

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Made available in DSpace on 2014-06-11T19:23:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2001-09-27Bitstream added on 2014-06-13T19:08:56Z : No. of bitstreams: 1 steil_l_me_araiq.pdf: 799428 bytes, checksum: ea2cd9b8adbc44bdd76ac6b53c7d3a09 (MD5)<br>Investigou-se a influência da utilização de inóculos sobre a digestão anaeróbia de resíduos de aves de postura, frangos de corte e suínos em biodigestores modelo batelada com volume útil de 60 L operados à temperatura ambiente, por meio da caracterização do potencial e distribuição da produção de biogás ao longo do tempo, o estudo da red

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Domingos, Joana Margarida Bendada. "Acidogenic digestion of effluents of the cheese industry in packed bed biofilm reactors." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10648.

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Dissertation for the Master degree in Biotechnology<br>The main goal of the present work was to study the production of volatile fatty acids (VFAs) from cheese whey powder (CWP) by employing a packed bed bioreactor (PPBR) for the anaerobic acidogenesis. First experiments were performed in 100-mL Pyrex bottles to study the acidogenesis trends, namely: lactose consumption, VFAs and biogas production and composition. These tests were done with freely suspended-cells (control experiment) and with immobilized cells using granular activated carbon (AC) and ceramic cube Vukopor S10 supports. The uti

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Turon, Violette. "Coupling dark fermentation with microalgal heterotrophy : influence of fermentation metabolites mixtures, light, temperature and fermentation bacteria on microalgae growth." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS201/document.

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La production de microalgues en hétérotrophie présente plusieurs avantages pour la production de biocarburants par rapport à la production autotrophe, comme une productivité plus importante en termes de biomasse et de lipides. Cependant, le développement industriel de ce procédé est limité par les coûts de productions associés au substrat organique (i.e. glucose) et à ceux liés à la stérilisation des fermenteurs. Les effluents de fermentation sombre, composés principalement d’acétate et de butyrate, pourraient être utilisés comme milieux de culture peu onéreux pour la culture hétérotrophe ou m

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Bowman, Tessa Leigh. "Analysis of factors affecting volatile compound formation in roasted pumpkin seeds with selected ion flow tube mass spectrometry (SIFT-MS)." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306242976.

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Mayeux, Bruno. "Ecologie microbienne et métabolisme associé : étude de l'eau interstitielle et de la roche argileuse du Callovo-Oxfordien dans le Laboratoire de Recherche Souterrain de l’Andra (Meuse/Haute-Marne)." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4783/document.

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Dans le cadre des recherches de l'ANDRA sur le confinement en couche géologique profonde de déchets radioactifs, une étude microbiologique a été menée sur l'eau interstitielle et l'argile du Callovo-Oxfordien (–490m, 165 millions d'années). Deux types d'études ont été menés, culturale et moléculaire.Malgré différentes tentatives d'extractions, et comme pour les études antérieures effectuées, aucun ADN n'a pu être extrait au cours de ce travail. Par contre, une approche culturale a permis de mettre en évidence la présence d'une microflore peu dense mais viable et métaboliquement assez variée :

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Elfving, Erik. "Hydrolys av primärslam för förbättrande av biologisk fosforreduktion vid behandling av hushållsavloppsvatten [Hydrolysis of primary sludge for enhancement of biological phosphorus removal in household wastewater]." Thesis, Linköping University, Department of Water and Environmental Studies, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-3997.

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<p>Hammarby Sjöstad is a new district of southern Stockholm built with focus on reduced environmental impact by recirculation of materials and sustainability. The environmental goals aim to cut the water consumption by half and a separate storm water treatment. Thus, the wastewater will be more concentrated and will originate from the households only. The Sjöstad project includes the idea of a local treatment plant for the household wastewater. To evaluate this possibility, Sjöstadsverket, an experimental treatment plant was constructed. New wastewater treatment processes are tested and evalua

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Borges, Luiz Felipe de Onofre. "Efeitos da enramicina ou da monensina sódica sobre a fermentação ruminal e a digestão total em bovinos." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/10/10135/tde-23032007-183536/.

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Foram objetivos do presente experimento estudar os efeitos da administração da enramicina, em comparação com a monensina sódica, sobre a fermentação ruminal e a digestibilidade total em bovinos. Doze fêmeas bovinas não-gestantes e não-lactantes (675 kg ± 63 de PV) foram distribuídas inteiramente ao acaso aos três tratamentos formados por um grupo controle (ausência de antibiótico), um grupo tratado com enramicina (antibiótico não-ionóforo) e outro tratado com monensina (antibiótico ionóforo). A enramicina foi administrada na dose de 20 mg/animal/dia e a monensina na dose de 300 mg/animal/dia.

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Panthi, Sudan Raj. "Effect of Arsenic on the Denitrification Process in the Presence of Naturally-Produced Volatile Fatty Acids and Arsenic Removal by New Zealand Iron Sand (NZIS)." Thesis, University of Canterbury. Department of Civil and Natural Resources Engineering, 2009. http://hdl.handle.net/10092/3199.

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This thesis is comprised of two phases; the first phase concerns the effect of arsenic on the denitrification process in the presence of naturally-produced volatile fatty acids (VFAs); while the second phase evaluates the arsenic removal efficiency of New Zealand Iron Sand (NZIS) by adsorption. To accomplish the first phase of the study, VFAs were first produced naturally in an acid-phase anaerobic digester by using commercially-available soy flour. Secondly, a denitrifying biomass was cultivated in a sequencing batch reactor (SBR) using domestic wastewater as a feed solution. Finally, a ser

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Facchin, Andrea. "New path for thermochemical-biological conversion with a power-to-material approach." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23117/.

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I sistemi termochimico-biologici si basano su due proprietà: la capacità dei processi termochimici di dissociare le macromolecole della biomassa producendo composti a basso peso molecolare, e l’abilità dei batteri di convertire substrati anche complessi in sostanze chimiche di valore. Questa tesi ha sviluppato un nuovo approccio metodologico per approfondire la possibilità di un accoppiamento diretto tra pirolisi e digestione anaerobica, allo scopo di produrre acidi grassi volatili (VFA), sinergicamente con l’utilizzo di idrogeno come fonte rinnovabile per aumentare il valore del prodotto fina

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Courtois, Noémie. "Etude du vieillissement de boues de papeterie utilisées pour la fabrication de briques de terre cuite : influence des produits de dégradation sur les caractéristiques céramiques des matériaux." Thesis, Bourgogne Franche-Comté, 2021. http://www.theses.fr/2021UBFCD003.

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Des boues de papier peuvent être incorporées au sein des mélanges industriels argileux pour l'élaboration de briques en terre cuite. Cette incorporation a plusieurs objectifs et avantages, notamment au niveau de l'optimisation du séchage des briques via l’effet hydrophile des fibres de papier, ainsi que pour la création de porosité au sein des briques améliorant leur résistance thermique. Or, certains phénomènes néfastes peuvent apparaître à l’échelle industrielle : fissuration des briques et apparition d'efflorescences (blanchiment de la surface des briques), notamment lorsque les boues de pa

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Becker, Eduardo Garcia. "Suplementação com ácidos graxos de cadeia média na emissão de metano, produção e qualidade do leite em vacas lactantes." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/10873.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Lipid additives used in the nutrition of dairy cows may affect both milk fat composition, as modifying the individual fatty acid profile, reducing methane emissions, becoming a sustainable practice for dairy cattle. To verify the effect of an additive based on medium chain fatty acids (MCFA) containing caproic acid, caprylic, capric, lauric and myristic, four treatments were tested: CTL (control without addition of MCFA), AGCM20 (5g MCFA), AGCM40 (10g MCFA) and AGCM80 (20g MCFA) on in vitro production gas (Experiment 1) and in th

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Alves, Teresa Cristina. "Efeitos de diferentes níveis de milho em grãos moídos (relação proteína:carboidratos não estruturais) em dietas para búfalos sobre o metabolismo no rúmen." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/74/74131/tde-24042007-085516/.

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As funções metabólicas dos bubalinos ainda não estão bem descritas, como em outros ruminantes e há carência de informação sobre o comportamento digestivo. A sincronização da degradação ruminal de proteína e amido propõe incrementar a produção de proteína microbiana no rúmen e a eficiência de utilização de energia, uma vez que as bactérias ruminais necessitam destes dois elementos disponíveis simultaneamente. Quatro búfalos fistulados no rúmen foram utilizados com objetivo avaliar os efeitos de dietas com diferentes níveis de milho em grãos moídos (0, 22, 37 e 49% na MS) em substituição ao feno

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Torres, Douglas Guedes Batista. "Produção de hidrogênio em reator anaeróbio de leito fixo e fluxo ascendente a partir de efluente de fecularia." Universidade Estadual do Oeste do Parana, 2014. http://tede.unioeste.br:8080/tede/handle/tede/193.

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Made available in DSpace on 2017-05-12T14:47:03Z (GMT). No. of bitstreams: 1 Douglas _Torres.pdf: 3616129 bytes, checksum: a4f03d06a9a51441bb0fbfebd263c6b0 (MD5) Previous issue date: 2014-02-20<br>Hydrogen is naturally formed in intermediate stages of anaerobic digestion and is subsequently consumed to generate products such as methane and hydrogen sulphide. So, in order to increase the energetic efficiency of gases produced in the system, it was necessary to separate hydrogen. It is essential to interrupt hydrogen consumption by methanogenic and sulphidegenic phases of anaerobic digestion p

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Hong, Yanjuan. "Enhanced Biological Phosphorus Removal for Liquid Dairy Manure." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/46067.

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Enhanced biological phosphorus removal (EBPR) has been widely used in municipal wastewater treatment, but no previous studies have examined the application of EBPR to treat dairy manure. This study was conducted to evaluate the (i) performance of pilot-scale EBPR systems treating liquid dairy manure, to balance the ratio of nitrogen to phosphorus in manure to meet crop nutrient requirements, (ii) effects of dissolved oxygen and solids retention time on the efficiency of EBPR, and (iii) effectiveness of gravity thickening for reducing the volume of harvested EBPR aerated mixed liquor. Two pilot

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