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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 38 for “"Solids retention time"”.
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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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Effect of solids retention time in membrane bioreactors on reverse osmosis membrane fouling
… large municipal wastewater treatment plant. The solids retention time (SRT) in the MBRs was adjusted to 2, 10, and 20 days for the three experiments conducted and various parameters were measured. These parameters included inorganics and organics in the water and on the RO membranes, as well as …
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The effect of ammonial loading, solids retention time and operating temperature on the biological nitrification and denitrification of high ammonia landfill leachate
The effect of ammonia loading, solids retention time and operating temperature (20, 17, 14, 12 and 10 °C) on the treatment of high ammonia landfill leachate (200, 300, 600, 1000, 1500 and 2000 mg NH4-N/L), was investigated. Two biological, single-sludge, nitrification-predenitrification systems …
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Enhanced Biological Phosphorus Removal for Liquid Dairy Manure
… (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-scale EBPR systems were used in this study. The ratio of the manure chemical …
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Exocellular Polymeric Substances, Bioflocculation and Sludge Settling Properties in a Combined Anaerobic/Activated Sludge Process
… (fully aerobic system) revealed that the minimum solids contact chamber hydraulic residence (HRT) time in which bioflocculation occurs satisfactorily (effluent SS concentrations < 20 mg/L) is 15 min; however, in the combined anaerobic/aerobic system HRT< 100 minutes resulted in poor floc settling …
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Fabrication of TIO₂-embedded PVDF membranes and their application in algae membrane bioreactor systems
… fed with artificial wastewater at a target solids retention time (SRT) of 25 days. Under steady-state conditions, the MBR systems had an average algae biomass concentration of 2350 mg/L (COD unit) with simultaneous removal of about 78% of phosphorus and 34% of nitrogen form wastewater. The …
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Changes in Dewatering Properties Between the Thermophilic and Mesophilic Stages in TPAD Systems
… Tech to determine the effect of thermophilic solids retention time (SRT) on sludge dewatering properties, to characterize system parameters associated with dewatering, and to understand the mechanisms causing changes in dewatering properties between the thermophilic and mesophilic phases. The …
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Experimental testing and modeling of partial nitrification at different temperatures
… of pH (7-9), temperature (10oC-35oC), and solids retention time (SRT) (5days-infinity) on the minimum/maximum substrate concentration (MSC) values. In addition, specific application for shortcut nitrification-anammox process at 10oC was analyzed. Furthermore, experimental data from …
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Modelling and control of an activated sludge process using ASM2d and taking into account sludge floc distribution effects
… the activated sludge process sometimes needs to operate at low dissolved oxygen concentrations. The ASM2d model describes the activated sludge process, if nitrification and denitrification occur during different phases in a sequencing batch reactor (SBR). Despite the widespread …
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The modelling of a falling sludge bed reactor using AQUASIM
… main feature of this bioreactor is the increased solids retention time obtained by allowing the solid matter to settle into three valleys, while the aqueous phase exits with a relatively short retention time. The main aim of this project was to identify the state of the art regarding mathematical …
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Bioflocculation: Implications for Activated Sludge Properties and Wastewater Treatment
… and magnesium on effluent quality; effect of solids retention time on effluent quality; and evaluation of floc properties during aerobic and thermophilic digestion. A floc model is proposed in which calcium, magnesium and iron are important to bioflocculation and the functionality of aeration …
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Kinetics of the release and precipitation of phosphorus in anaerobic digesters sequencing biological phosphorus removal systems
… and secondary anaerobic digesters each had a solids retention time of approximately 120 days. The results indicated that at least 60 percent of the phosphorus in the poly-phosphate granules would be solubilized during endogenous decay and digestion under anaerobic conditions. This is …
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Effects of Thermal Hydrolysis Pre-Treatment on Anaerobic Digestion of Sludge
… based on various characteristics including pH, solids removal, COD removal and gas production. The study was conducted in two phases to investigate the effect of change in mesophilic temperature (37°C and 42°C) and the effect of solids retention time (SRT) (15 days and 20 days). Thermally …
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Impact of operating conditions on thermal hydrolysis pre-treated digestion return liquor
… studied were (1) operating temperature (2) solids retention time (SRT) in the anaerobic digester (3) THP flash pressure (4) the effect of co-digestion of sewage sludge with food waste and, (5) polymer conditioning. Operating temperature and polymer dose had the most significant impact on DON …
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Anaerobic Digestion: Factors Effecting Odor Generation
Land application of anaerobically stabilized biosolids is a beneficial method of handling the solid residuals from a wastewater treatment plant. One of the main issues that restrict land application of biosolids is nuisance odors associated with biosolids. Despite its importance, few studies have …
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Investigation of hypothesized anaerobic stabilization mechanisms in biological phosphorus removal systems
… a 12-hour nominal HRT, 10-day BSRT (Biological Solids Retention Time), 1Q RAS flow, and varying synthetic feed compositions. Data from this system were used to demonstrate that, by eliminating the need to quantify the clarifier OUR, the Boundary Exchange AnS determination method developed in …
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Optimization of Phosphorus Removal and Mineral Characterization in Aerated Anaerobic Digestate with Divalent Cation Addition
… fertilizer or its sequestration into Class A biosolids, creating a nutrient-rich soil product. This approach can reduce phosphorus recycling in solids handling, prevent scaling issues, and enhance the value of biosolids as a marketable, sustainable product. In a digested solids storage tank that …
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Effect of Process Intensification Techniques on Biosolids Management
… main and side stream wastewater treatment on biosolids management in terms of anaerobic digestion enhancement, dewaterability improvement, odor mitigation, as well as phosphorus and nitrogen removal. The first part of this study was conducted to understand the effect of anaerobic digester solids …
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Variations in the Oxidative Rates of Nitrosomonas europaea in Coke-Plant Activated Sludge.
… in an activated-sludge process is, however, sometimes inconsistent. Thus, in order to maximize the efficiency of this biological process, it is essential to improve our understanding of the population dynamics and physiology of the nitrifiers by developing a fast and accurate method for …
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The Effect of Steady-State Digestion Temperature on the Performance, Stability, and Biosolids Odor Production associated with Thermophilic Anaerobic Digestion
… of operational parameters such as mixing, solids retention time, and digestion temperature are often selected on the basis of certain desirable outcomes such as the deactivation of human pathogens, these parameters have been shown to have a broad impact on the overall sludge digestion …
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