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 20 of 84 for “"Effluent quality"”.
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Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality
… 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 contributing up to 68 percent of …
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The use of two-stage complete mixing activated sludge for the improvement of effluent quality
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1959.
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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
… the PFR configurations produce better sludge quality, in terms of settleability and dewaterability, and subsequently better effluent quality than CSTR systems. In this experiment, the effect of SRT and substrate loading rate on activated sludge was investigated using bench scale SBRs. PFR and …
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The influence of nitrogen and sludge age change in reactor performance and biopolymer production in activated sludge
… to sludge a settling characteristic and effluent quality. In order to obtain the sludge samples for the analyses, two completely mixed, continuous flow activated sludge systems were maintained during this research. Raw wastewater from the Celanese Fiber Plant located at Narrows, Virginia …
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Assessment of ultraviolet light disinfection efficiency of advanced wastewater treatment plant effluent
… of a 3-bank UV disinfection system for filter effluent from the Clark County Advanced Wastewater Treatment Plant has shown {dollar}>{dollar}4-log removal of seeded MS-2 coliphage at UV dosages of 80-100 milliwatt-seconds per square centimeter (mW-s/cm{dollar}\sp2{dollar}), and consistent …
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Characterization, Treatment, and Improvement of Aquacultural Effluents
During the water quality and sludge characterization phase, average effluent quality over the course of a day was not found to be impaired during a 7-month sampling and monitoring study at the three trout farms. However, effluent quality was found to change significantly during times of high farm …
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Changes in Septic Tank Effluent Due to Water Softener Use
… 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, leading to shortened lives …
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Bioflocculation: Implications for Activated Sludge Properties and Wastewater Treatment
… important in determining settling, dewatering, effluent and digested sludge properties (activated sludge properties) and may be vital to the function of all processes related to the above properties. In these studies, it was shown that divalent cations such as calcium and magnesium improved …
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The development of a three phase plant-wide mathematical model for sewage treatment
… while maximizing nutrient recovery and improving effluent quality, the purpose of this project is to develop three phase (aqueous-gas-solid) steady state and dynamic mathematical models for the anaerobic and aerobic digestion of sludge; including waste activated sludge (WAS) produced by biological …
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The use of advanced treatment methods for removal of color and dissolved solids from pulp and paper wastewater
… objective of the treatment was to provide a high quality effluent suitable for direct recycling. This advanced treatment followed pretreatment by lime, alum, or ferric chloride. Required effluent quality was defined as being 5 Pt-Co units color and 75 mg/L chloride. Granular and powdered carbons, …
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Using mathematical models to track phosphorus in a full-scale wastewater treatment plant
… marketable, while ensuring maintenance of good effluent quality from the plant. To address these challenges, the plant wide model (PWM_SA) of Ikumi et al. (2015) was utilized to evaluate and propose operational strategies for Zeekoegat WWTW of the City of Tshwane to help with future design or …
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Effects of hydraulic loading and laundry detergent on the operation of aerobic package treatment systems
… two had a hydraulic retention time of 0.5 days. Effluent quality was stable and good with regard to chemical oxygen demand (COD) and ammonia (NH)-N) and seemed to be independent of hydraulic retention time. All of the systems performed well, despite considerable variability in influent strength. …
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Manganese removal by oxidation and mixed-media filtration
… If this was the case the filter produced an effluent concentration of manganese below the MCL under all pre-oxidative conditions and under auto-oxidative conditions when the pH was above neutral. Increased flow rate through the filter caused deeper penetration of manganese into the filter …
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Engineering analysis of a Chinese-type anaerobic digester
… intermittent feeding was developed to predict effluent quality and gas production. Stimulus-response data indicated that by positioning the outlet at the bottom of the digester, flow characteristics could be improved, leading to reductions in dead space and bypassing volumes by 47% and 91%, …
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Development of an evaluative framework promoting a paradigm shift towards resource recovery in wastewater treatment
… impact of wastewater treatment processes on air quality from emission of greenhouse gases, on land from sludge disposal and on downstream water bodies via effluent discharge can be mitigated. The performance of WWTP design and control strategies can be evaluated, based on their impact on …
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Effect of Reactor Feeding Pattern on Performance of an Activated Sludge SBR
… (SBR) in order to determine if these changes in effluent water quality and settling and dewatering properties are significant, so they can be considered in future studies or if they can be recommended as crucial when operating and designing wastewater treatment plants. The activated sludge …
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Simplification of Complex WWTP Models into Simple Design and Evaluative WRRF Tool
… plants treat influent wastewater to a specified effluent quality, through several processes, before discharging it into the receiving water bodies. One of the by-products of these treatment processes is a nitrogen (N) and phosphorus (P) rich dewatering liquor (DWL). Generally, South African WWTPs …
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The development of an ancillary textile industry waste treatment process
… producing polyester and casein buttons. The effluent has a high pH and COD; contains metallic poisons; and is highly coloured. It exceeds the limitations for effluent quality promulgated by the Cape Town Municipality before discharge to the sewers. A certain measure of pretreatment before …
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The effect of treatment process variations on the thickening and dewatering characteristics of water plant sludges
… in a 400 L/day continuous-flow pilot-plant. The effluent turbidity was monitored to evaluate process modifications. Sludge thickening and dewatering characteristics improved with reductions in the coagulation pH, increases in the influent turbidity levels, and/or reductions in the coagulant …
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An investigation into control strategies for activated sludge wastewater treatment plants.
… exist for improving the efficiency and quality of the treatment before releasing the treated water into the environment. This thesis presents the development of MATLAB computer simulation models for activated sludge wastewater treatment plants. A comparison of control systems has been …
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