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 15 of 15 for “"sludge volume index"”.
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Investigation of the microbial populations in the activated sludge of the Hoechst-Celanese wastewater treatment plant
… populations in the Hoechst-Celanese activated sludge were examined. Heterotrophs, denitrifiers, sulfate-reducers, protozoa and filamentous bacteria were enumerated. Variations in microbial populations were compared with influent and effluent constituent concentrations, and with aeration basin …
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Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality
The effect of solids retention time (SRT) or sludge age on activated sludge properties and effluent quality was investigated using laboratory scale reactors. It was found that an increase in SRT resulted in an increase in effluent solution polysaccharide, with the < 3,000 daltons (3K) size fraction …
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The effects of dissolved oxygen concentration on the kinetics and settleability of activated sludge
… coefficient and settleability of activated sludge. Synthetic substrate loadings of 0.25, 0.50, 0.75 were applied to bench scale activated sludge reactors with average mixed liquor volatile suspended solids concentrations of 2000 mg/1. The substrate removal rate coefficient, oxygen uptake …
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The effect of fixed film pretreatment on activated sludge stability during the treatment of cellulose acetate wastewater
The activated sludge (AS) process used for treating high-strength cellulose acetate wastewater of Celanese Corporation, Pearisburg, Virginia, produces a sludge with poor flocculation and settling characteristics, particularly during the periods of shock organic loadings. Pilot-scale treatment units …
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The effect of high temperatures (30 degrees Celsius) on biological nutrient removal performance
… of this investigation was to evaluate activated sludge biological nutrient removal (BNR) performance at elevated temperatures for possible application of nitrification denitrification (ND) and ND biological excess phosphorus removal (NDBEPR) systems to municipal wastewater treatment in the …
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The influence of nitrogen and sludge age change in reactor performance and biopolymer production in activated sludge
… study investigated the influence of nitrogen and sludge age change in reactor performance and biopolymer production in activated sludge systems. The qualitative and quantitative analyses of the naturally occurring biopolymers were performed and the results were correlated to sludge a settling …
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The effect of cation addition on the settling and dewatering properties of an industrial activated sludge
… of cation addition on an industrial activated sludge system and to determine the applicability of the findings of a previous VPI&SU doctoral student (Higgins, 1995) to this industrial sludge. From this research, the implications on the full-scale industrial wastewater treatment system could be …
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Gravity selector-enabled kenaf recirculation and reuse as a renewable ballasting agent for sludge settleability enhancement in a municipal wastewater secondary process: A real wastewater pilot-scale study
Sludge densification can be achieved through granulation/densification, migrating carriers, ballasted flocculation, or a combination of these approaches. Hydrocyclone-enabled continuous flow densification has been applied for full-scale applications; however, it requires long startup times and, in …
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The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems
… bulking, which causes deterioration in sludge settleability has been shown, in two nation-wide surveys to be a problem of considerable proportions. Poor sludge settleability in the secondary clarifier limits the daily flow and load that can be treated in activated sludge wastewater …
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Enhanced Biological Phosphorus Removal for Liquid Dairy Manure
… of gravity thickening for reducing the volume of harvested EBPR aerated mixed liquor. Two pilot-scale EBPR systems were used in this study. The ratio of the manure chemical oxygen demand expressed as volatile fatty acids to phosphorus used ranged from 18:1 to 45:1. The phosphorus removal …
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TREATMENT OF PETROLEUM REFINERY WASTEWATER IN AN INNOVATIVE SEQUENCING BATCH REACTOR
The difficulty with sludge settleability is considered one of the main drawbacks of sequencing batch reactors. The aim of this study therefore is to improve sludge settleability by introducing a novel, two-stage settling sequencing batch reactor (TSSBR) separated by an anoxic stage. The performance …
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Hydrocyclone Implementation at Two Wastewater Treatment Facilities To Promote Overall Settling Improvement
… as well as aid the formation of aerobic granular sludge (AGS). There has been a multitude of settling improvement experiments and initiatives for full scale wastewater treatment. However, little research has been produced utilizing larger hydrocyclones (20 m3/hr) at a full-scale wastewater …
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Development of Transitional Settling Regimen Parameters to Characterize and Optimize Solids-liquid Separation Performance
… in monitoring and optimizing the activated sludge process without the need for expensive or specialized equipment. Current settling characteristic measurements that don't require specialized instruments such as sludge volume index (SVI) or initial settling velocity (ISV), have no fundamental …
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Effect of Feed Rate and Solid Retention Time (SRT) on Effluent Quality and Sludge Characteristics in Activated Sludge Systems Using Sequencing Batch Reactors
… element to the successful operation of activated sludge systems is efficient solid liquid separation achieved by bioflocculation. Bioflocculation refers to the process of microbial aggregation to form activated sludge flocs, dependent on the interaction of exocellular polymeric substances (EPS) to …
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OXYHYH20-Integrated Renewable Hydrogen and Oxygen Production for Reduced Emissions in Wastewater Treatment Plant Operations
… the oxygen could be used to replace the large volumes of pumped air required for aerobic biological treatment. Renewable hydrogen production is produced by splitting water, via electrolysis. For each kg of hydrogen produced via electrolysis, 8 kg of oxygen are co-produced and vented to the …