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Showing 1 to 20 of 26 for “"Solids Retention Time (SRT)"”.
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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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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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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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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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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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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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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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Development of Kinetic Parameterization Methods for Nitrifying Bacteria using Respirometry
… of the biomass. This study developed a time and labor efficient respirometric method to distinctly measure oxygen half-saturation coefficients for both ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) without the use of selective inhibitors. By eliminating the use of …
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Bioaugmentation and Retention of Anammox Granules to a Mainstream Deammonification Bio-Oxidation Pilot with a Post Polishing Anoxic Partial Denitrification/Anammox Moving Bed Biofilm Reactor
… This work describes the bioaugmentation and retention of anammox (AMX) granules in a continuous adsorption/bio-oxidation (A/B) mainstream deammonification pilot-scale process treating domestic wastewater. The AMX granules were collected from the underflow of a sidestream DEMON® process. The …
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Enhanced anaerobic digestion of combined wastewater sludges through solubilization of waste activated sludge
… and sodium hydroxide and mechanical mixing times for waste activated sludge (WAS) solubilization; the second, pilot-scale phase monitored the performance of anaerobic digestion, using mixtures of solubilized WAS and primary sludge as a feed. The first phase results showed that solubilization …
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Mathematical Modeling of Carbon Removal in the A-Stage Activated Sludge System
… was necessary due to short hydraulic residence times in A-stage systems which do not allow for complete enmeshment and bioflocculation of these particles as occurs in conventional activated sludge systems (which have longer solid retention times and hydraulic retention times). It was necessary …
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The effect of operational and environmental parameters on the acid-phase anaerobic digestion of primary sludge
… operational parameters included the hydraulic retention time (HRT) and the solids retention time (SRT), while pH, reactor configuration and influent characteristics were the environmental factors of interest. Moreover, an attempt was made to identify the most significant metabolic pathways …
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Fate and Impacts of Contaminants of Emerging Concern during Wastewater Treatment
… sulII, tet(C), tet(G), and tet(X) with longer solids retention time (SRT) exhibiting a greater extent of removal. Thermophilic anaerobic digesters performed similarly to each other and provided more effective reduction of erm(B), erm(F), tet(O), and tet(W) compared to mesophilic digestion. …
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Evaluation of Nitrification Inhibition Using Sequencing Batch Reactors and BioWin Modeling, and the Effect of Aqueous Film Forming Foam on Biological Nutrient Removal
… of these VIP SBRs would remain a control at all times, while the other would be used to evaluate suspected inhibitors to nitrification. The first phase of this project was to determine whether NP was inhibited when compared to VIP, which would be ascertained through a comparison of nitrification …
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Developing a Mechanistic Understanding and Optimization of the Cannibal Process: Phase II
… activated sludge process. The hydraulic retention time (HRT) in the Cannibal bioreactor and the interchange rate (the percent of sludge by mass interchanged between the activated sludge system and the bioreactor on daily basis) are the two important operational parameters in the …
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