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Dissertations / Theses on the topic 'Dissolved oxygen Dam removal'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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1

Zhang, Yiding. "Predicting River Aquatic Productivity and Dissolved Oxygen before and after Dam Removal in Central Ohio, USA." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337983076.

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2

Ba, Mouhamadoul Moustapha. "Dynamique des interactions physico-chimiques en zone hyporhéique : influence des crues et de la suppression des barrages." Electronic Thesis or Diss., Université de Rennes (2023-....), 2023. http://www.theses.fr/2023URENB076.

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Dans le contexte de la rivière Sélune en France, où deux barrages sont en cours de retrait pour rétablir la continuité hydro-sédimentaire de la rivière, cette thèse s'est fixée pour objectif de comprendre les impacts potentiels de ces changements sur la dynamique de la zone hyporhéique. Cette zone, cruciale dans les cycles hydrologiques ainsi que pour la reproduction de certaines espèces de poisson, demeure mal comprise du fait du faible nombre de donnée disponibles. Pour pallier à ce problème, un réseau de capteurs autonomes mesurant différentes variables physico-chimiques a été déployé à par

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3

Beck, Jason Lee. "Optimization of Biological Nitrogen Removal From Fermented Dairy Manure Using Low Levels of Dissolved Oxygen." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35593.

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A pilot scale nitrogen (N) removal system was constructed and operated for approximately 365 days and was designed to remove inorganic total ammonia nitrogen (TAN) from solids-separated dairy manure. An anaerobic fermenter, upstream of the N removal reactor, produced volatile fatty acids (VFAs), to be used as an electron donor to fuel denitrification, and TAN at a COD:N ratio of 18:1. However, sufficient amounts of non-VFA COD was produced by the fermenter to fuel the denitrification reaction at an average NO3- removal rate of 5.3 Â± 2 mg/L NO3--N. Total ammonia N was removed from the ferm

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4

楊龍元 and Lung-yuen Christopher Yeong. "Removal of wastewater cod and nitrogen using fibrous packing media." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210636.

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5

Owusu-Agyeman, Isaac. "Systems for ammonium concentration for further removal in the partial nitritation/anammox technology." Thesis, KTH, VA-teknik, Vatten, Avlopp och Avfall, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99356.

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Anammox is one of the main processes discovered quite recently for removal of ammonium from wastewater. Anammox process is cost effective, in that low energy and carbon source is needed. Partial nitritation is a perquisite for anammox in wastewater treatment for removal nitrogen and therefore partial nitritation/Anammox technology is studied substantially and applied in full-scale. However, the technology at present can only be used to treat high rich ammonium streams. Application of Anammox for treatment of low ammonium wastewater is not possible because of low yield of Anammox bacteria. The

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6

Nair, Arthur William. "Investigation of the Effects of Sequential Anaerobic, Anoxic and Aerobic Zones on Dissolved Oxygen Transfer Parameters in a biological Nutrient Removal Pilot Plant." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46264.

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Bench and pilot scale determinations of the volumetric oxygen transfer coefficient, K<sub>L</sub>a, were performed on an improved A²/O biological nutrient removal (BNR) pilot plant. Effluent from a full scale primary clarifier, used as pilot plant influent, was found to have an alpha (ratio of process to clean water K<sub>L</sub>a) of 0.71 as determined in a 21 liter bench scale reactor and an alpha of 0.332 as determined in a 0.45 m³ aeration basin of the 2.4 m³ pilot plant. Alpha of a 1:1 mixture of primary clarifier effluent with pilot plant return activated sludge was determined to be 0.94

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7

Petre, Catalin Florin. "Alkaline oxidation of hydrosulfide and methyl mercaptide by iron/cerium oxide-hydroxide in presence of dissolved oxygen. Possible application for removal of Total Reduced Sulfur (TRS) emissions in the Pulp & Paper industry." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24330/24330.pdf.

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Le sulfure d'hydrogène (H2S) et le méthyle-mercaptan (MM) sont les contaminants odorants les plus abondants parmi le quatuor qui compose les soufres réduits totaux (SRT) (H2S, CH3SH, (CH3)2S, (CH3)2S2) dans les émissions atmosphériques des industries papetières Kraft. L'association de SRT avec suffisamment d'oxygène peut être exploitée sur la base de la chimie du fer, pour convertir les SRT gazeux en produits non-volatils et non-odorants. Le procédé utilise l'oxyde-hydroxyde de Fe/Ce (Fe/CeOx) dans des solutions alcalines où l'absorption oxydative de H2S et de MM (sous forme d’ hydrosulfure et

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8

Petre, Cătălin Florin. "Alkaline oxidation of hydrosulfide and methyl mercaptide by iron/cerium oxide-hydroxide in presence of dissolved oxygen : possible application for removal of Total Reduced Sulfur (TRS) emissions in the Pulp & Paper industry." Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19640.

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Tableau d'honneur de la Faculté des études supérieures et postdoctorales, 2006-2007<br>Le sulfure d'hydrogène (H2S) et le méthyle-mercaptan (MM) sont les contaminants odorants les plus abondants parmi le quatuor qui compose les soufres réduits totaux (SRT) (H2S, CH3SH, (CH3)2S, (CH3)2S2) dans les émissions atmosphériques des industries papetières Kraft. L'association de SRT avec suffisamment d'oxygène peut être exploitée sur la base de la chimie du fer, pour convertir les SRT gazeux en produits non-volatils et non-odorants. Le procédé utilise l'oxyde-hydroxyde de Fe/Ce (Fe/CeOx) dans des solut

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9

Oliveira, Pedro Henrique da Silva. "Influ?ncia da intensidade de aera??o na forma??o do floco de lodo ativado e na efici?ncia de remo??o de mat?ria org?nica." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15858.

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Made available in DSpace on 2014-12-17T15:01:35Z (GMT). No. of bitstreams: 1 PedroHSO_DISSERT.pdf: 2680953 bytes, checksum: 2a5742ac4e3d4679d06b09232988727f (MD5) Previous issue date: 2014-07-24<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>In wastewater treatment, activated sludge systems have been a technology widely applied as secondary treatment. During this step, which has a strong biological aspect, it is necessary to introduce oxygen supply for the maintenance of metabolic activity of the bacteria through the aerators. Aeration devices are responsible for most of t

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10

Селянина, Т. В., та T. V. Selyanina. "Количественное определение натриевой соли 2-этилтио-6-нитро-1,2,4-триазоло-[5,1-c]-1,2,4-триазин-7-она дигидрата методом вольтамперометрии : магистерская диссертация". Master's thesis, б. и, 2020. http://hdl.handle.net/10995/94625.

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Объектом исследования являлось вещество натриевая соль 2-этилтио-6-нитро-1,2,4-триазоло-[5,1-c]-1,2,4-триазин-7-она, дигидрат (УПИ-802). Цель работы: количественное определение лекарственного вещества натриевой соли 2-этилтио-6-нитро-1,2,4-триазоло-[5,1-c]-1,2,4-триазин-7-она дигидрата методом вольтамперометрии. В случае УПИ-802 наиболее полезным для количественного определения является сигнал электровосстановления нитрогруппы. Исследованы процессы восстановления нитрогруппы исследуемого вещества в водных и апротонных растворах с применением вольтамперометрии в условиях физического удаления ра

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11

Zaidel, Peter. "Impacts of Small, Surface-Release Dams on Stream Temperature and Dissolved Oxygen in Massachusetts." 2018. https://scholarworks.umass.edu/masters_theses_2/680.

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Dams fragment streams and rivers, with >14,000 in New England alone, and have the potential to significantly alter the physical, chemical, and biological characteristics of lotic systems. For example, dams can alter temperature and dissolved oxygen (DO) regimes, which can, in turn, affect species distributions, whole system metabolism, and nutrient processing rates. Moreover, changes in temperature signal life history cues (e.g., emergence, egg-hatching, migration) for many species of aquatic organisms, and present another avenue for dams to alter biotic communities. Despite the prevalence of

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12

Wang, Xiaofei. "Impact of dissolved oxygen on PHA production and integration with biological nutrient removal processes." Doctoral thesis, 2018. http://hdl.handle.net/10362/36290.

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Bio-based and biodegradable polymers are regarded as potential replacements of traditional fossil based plastics. Polyhydroxyalkanoates (PHAs) are widely studied biopolymers due to their broad range of thermal and mechanical properties. The impacts of operational conditions, such as pH, temperature, organic loading rate and sludge retention time, in PHA production process by mixed microbial cultures (MMCs) have been evaluated by previous studies, but the influence of dissolved oxygen (DO), which is directly related to process energetic demand, was rarely discussed. This thesis is focused on th

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13

Rocca, Jesse. "GA Optimized Fuzzy Logic Controller for the Dissolved Oxygen Concentration in a Wastewater Bioreactor." Thesis, 2012. http://hdl.handle.net/10214/3690.

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A fuzzy logic controller (FLC) for the dissolved oxygen (DO) concentration of a wastewater bioreactor is presented. The FLC is developed and tested based on simulations using first order plus dead time models obtained from experiments with an actual wastewater bioreactor. The FLC uses feedback of the error in DO concentration and rate of change of the DO concentration and manipulates the stem position of the flow control valves (FCVs) supplying air to the bioreactor. The proposed FLC is tested for robustness across several process models, two of which include proposed worst-case process condit

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14

Chou, Chih-Ming, and 周志明. "Influence of Dissolved Oxygen on Nitrogen and Phosphorus Removal from Municipal Wasterwater by Anaerobic-Aerobic-Anoxic-Aerobic Activated Sludge Process." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/09503466180876771827.

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碩士<br>淡江大學<br>水資源及環境工程學系<br>84<br>This study is a experiment for taking nitrogen and phosphorus off from themunicipal wasterwater by "anaerobic- aerobic-anoxic-aerobic activated sludgeprocess". The experimental influent was typical municipal wasterwater with theflow of 60.0 L/hr,and 75% raw wastewater flow into the anaerobic tanks, theothers to the anoxic tanks, and the return sludge are 25%. The main controlfactor is dissolved oxygen concentration in the previous aerobic tanks,

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15

Carvalheira, Mónica Isabel Gonçalves. "The effect of key process operational conditions on enhanced biological phosphorus removal from wastewater." Doctoral thesis, 2014. http://hdl.handle.net/10362/14295.

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Enhanced biological phosphorus removal (EBPR) is the most economic and sustainable option used in wastewater treatment plants (WWTPs) for phosphorus removal. In this process it is important to control the competition between polyphosphate accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs), since EBPR deterioration or failure can be related with the proliferation of GAOs over PAOs. This thesis is focused on the effect of operational conditions (volatile fatty acid (VFA) composition, dissolved oxygen (DO) concentration and organic carbon loading) on PAO and GAO metabolism.

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16

"Alkaline oxidation of hydrosulfide and methyl mercaptide by iron/cerium oxide-hydroxide in presence of dissolved oxygen. Possible application for removal of Total Reduced Sulfur (TRS) emissions in the Pulp & Paper industry." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24330/24330.pdf.

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