Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"deflocculation"”.
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Development of a Biosensor to Predict Activated Sludge Deflocculation, and the Link Between Chlorination and Potassium Efflux
… to be proactive in assessing and solving deflocculation events, this study has tested the components of a biosensor to predict deflocculation and investigated the mechanistic cause of deflocculation relating to chlorination of activated sludge cultures. In order to effectively manage upset …
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Elucidating the Role of Toxin-Induced Microbial Stress Responses in Biological Wastewater Treatment Process Upset
… stress proteins did not explain the significant deflocculation upsets that were characteristic of many of the industrially-relevant chemicals tested, including pentachlorophenol and cadmium. Although the purpose of stress response mechanisms is protective at the cellular level, the effect may be …
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Effect of Reactor Feeding Pattern on Performance of an Activated Sludge SBR
… exocellular polymeric substances present due to deflocculation. As expected, the changes in feeding strategies affected all of the properties measured. When the feeding time was maintained low (pulse feed) the effluent quality and settling properties were the best. As the feeding time was …
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High-Intensity Shear as a Wet Sludge Disintegration Technology and a Mechanism for Floc Structure Analysis
… to enhance solublization of solids, though deflocculation and deterioration of dewaterablility was observed. Anaerobic digestibility appears to be enhanced by the addition of a high shear as shown by increases in gas production and volatile solids destruction. The dewatering properties of …
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The influence of cations on activated sludge behavior
… released biopolymer and resulted in sludge deflocculation. A relationship between unbound biopolymer and soluble effluent COD was observed but no discernible relation between biopolymer binding and sludge settling and dewatering properties was found. Cations were found to reduce polymer …
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Lacustrine Arcellinida (Testate Lobose Amoebae) as Bioindicators of Arsenic Contamination: A new tool for Environmental Risk Assessment
… sample processing protocol, using chemical deflocculation, was developed to determine optimal approaches for reducing residual organic matter in lake sediments with minimal Arcellinida test degradation. The results revealed that treatment with 5% potassium hydroxide led to the highest …
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Elucidating the Response of Activated Sludge Cultures to Toxic Chemicals at the Process, Floc and Metabolic Scales
… there was a clear correlation between biomass deflocculation and increases in the effluent soluble COD of the shocked reactors for different chemical sources. With this study, we were able to establish a source-effect matrix linking classes of chemical toxins to their potential inhibitory …
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Changes in Septic Tank Effluent Due to Water Softener Use
… levels in activated sludge plants can lead to deflocculation and poor effluent quality. Therefore, it is logical to assume that high sodium levels that result from the exchange of calcium and magnesium for sodium in home softeners could give rise to poor effluent quality from septic tanks, …
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Upset Events At Wastewater Treatment Plants: Implications for Mitigative Strategy Development and Bioreactor Microbial Ecology
… in community structure or due to cadmium induced deflocculation. In fact, this study demonstrates that transient cadmium stress reduces predator abundance within the activated sludge community and this reduction in predator grazing was responsible for the increase in bacterial abundance. This …