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Showing 1 to 20 of 31 for “"Aerobic digestion"”.
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Advanced aerobic digestion to optimize pathogen reduction: Staged pre-treatment in aerobic digestion
… solution for smaller communities that utilize aerobic digestion. However, traditional aerobic digestion produces Class B biosolids at best which raises public concern regarding the fate of pathogens following land application. The main goal of this work was to determine a plan to help an …
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Aerobic digestion of trickling filter humus
… purpose of this investigation was to study the aerobic digestion of trickling filter humus and the relationship between digestion and the subsequent filterability of the sludge. Five individual, ten liter, batch-type digestion studies were conducted at 20°C for detention periods ranging from 22 …
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The effects of aerobic digestion on centrifugation
… was to study the effects of activated sludge aerobic digestion on the subsequent performance of a centrifuge. Two runs, utilizing two, 55 gallon barrels as digesters per run, were conducted using detention periods of 15 and 14 days, for run #1 and #2, respectively. Besides centrifugation, …
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The aerobic digestion of semi-chemical pulp mill wastes
… was to study the treatment of these wastes by aerobic digestion prior to the discharge of the wastes into the stream. The waste studied was obtained. from the pulp mill of the National Container Corporation at Big Island, Virginia. The investigation was carried out by aeration of the waste in …
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Anaerobic / Aerobic Digestion for Enhanced Solids and Nitrogen Removal
Anaerobic digestion of wastewater sludge has widely been in application for stabilization of sludge. With the increase in hauling cost and many environmental and health concerns regarding land application of biosolids, digestion processes generating minimized sludge with better effluent …
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Volatile fatty acid production during thermophilic aerobic digestion pre-treatment
… to demonstrate the application of thermophilic aerobic digestion pre-treatment as a method of producing volatile fatty acids (VFA) for potential use as a denitrification carbon source. In order to achieve this goal, volatile fatty acid production and nitrogen release were examined under two …
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Anaerobic and Combined Anaerobic/Aerobic Digestion of Thermally Hydrolyzed Sludge
Sludge digestion has gained importance in recent year because of increasing interest in energy recovery and public concern over the safety of land applied biosolids. Many new alternatives are being researched for reducing excess sludge production and for more energy production. With an increase in …
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Aerobic digestion of waste activated sludge from biological nutrient removal activated sludge systems
… at wastewater treatment plants (WWTPs). Hence, aerobic digestion of the WAS from biological nutrient removal (BNR) activated sludge (AS) systems was carried out under batch conditions to (1) measure changes in nitrogen and phosphorus concentrations in solid and liquid phases during aerobic batch …
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Sequential Anaerobic-Aerobic Digestion: A new process technology for biosolids product quality improvement
Anaerobic digestion is widely used for stabilization of solids in sewage sludges. Recent changes in the priorities and goals of digestion processes are focusing more attention on the efficiency of these processes. Increasing hauling cost and restrictions for land applications are two factors which …
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The removal of nitrogen and phosphorus in anoxic-aerobic digestion of waste activated sludge from biological nutrient removal systems
… blockages. This investigation studies anoxic-aerobic digestion (aerobic digestion with intermittent aeration), as an alternative digestion of BNR WAS. Aerobic digestion is simple to operate – being an extension of the activated sludge process, requiring aeration and limited recycling. This …
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Effects of Anaerobic and Aerobic Digestion at Mesophilic and Thermophilic Temperatures on the Quantity of Carbapenem Resistance Genes in Wastewater Sludge
… in sludge during wastewater treatment. Anaerobic and aerobic digestions are commonly used for sludge treatment. Due to the public health relevance of the land application of digested sludge, this research aimed to investigate the effects of the digestion on the abundance and removal of …
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Cations and activated sludge floc structure
… and also to determine their influence on digestion performance. For this purpose, cations in solution and in floc were evaluated along with various activated sludge characteristics and the collected waste activated sludge underwent both anaerobic and aerobic digestion. It was found that …
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Toxicity characteristic leaching procedure analysis of dye containing sludges
… the mean ADMI color values for undigested and aerobically digested sludges were 240 and 156 ADMI color units respectively. Concentrations of individual dyes that may have leached into the TCLP extracts were below detection limits. The reactive vinyl sulfone aniline moiety, which is released as …
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Factors affecting the filtration characteristics of aerobically digested sludge
… scale investigations of the effects of aerobic digestion on activated sludge dewatering and to attempt to determine the chemical and biological mechanisms affecting sludge filterability. The results of this investigation showed that aerobic digestion can have a considerable effect on …
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Utilization of Ultraviolet-Visible Spectroscopy and Rheology for Sludge Characterization and Monitoring
… were successful in monitoring the progress of aerobic digestion. Torque rheology was not found to be sensitive enough for monitoring aerobic digestion of sludge. Torque rheology detected significant changes in anaerobically digested sludge when trivalent cations were added, but not when …
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The effects of pH on aerobic sludge digestion
Batch studies to determine the effects of pH on aerobic digestion of waste activated sludge were performed using a detention time of at least 20 days. Total and volatile solids reductions were not affected over a pH range from 3.5 to 9.5. Somewhat greater solids reductions were realized when pH was …
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The development of a three phase plant-wide mathematical model for sewage treatment
… state and dynamic mathematical models for the anaerobic and aerobic digestion of sludge; including waste activated sludge (WAS) produced by biological excess phosphorus removal (BEPR) plants, within a plant-wide setting.
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Biopolymer and Cation Release in Aerobic and Anaerobic Digestion and the Consequent Impact on Sludge Dewatering and Conditioning Properties
… cation release from activated sludge flocs. Both aerobic and anaerobic digestion processes were considered from two different activated sludge sources at a temperature of 20° C. Polymer demand and specific resistance to filtration increased with an increase in total soluble biopolymer …
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Extracellular Polymeric Substances in Activated Sludge Flocs: Extraction, Identification, and Investigation of Their Link with Cations and Fate in Sludge Digestion
… behaves differently when subjected to shear, aerobic digestion, anaerobic digestion and other processes. In order to examine this floc hypothesis, the research mainly consisted of three sections: 1) development of EPS extraction methods that target cations of interest (divalent cations, …
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