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Showing 1 to 20 of 25 for “"sludge digestion"”.
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The effects of pH on aerobic sludge digestion
… 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 held …
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A study of multi-stage sludge digestion systems
… thermophilic and/or mesophilic anaerobic sludge digestion systems were studied to evaluate their solids reduction, odor generation after centrifugal dewatering and indicator organism reduction in comparison to single-stage thermophilic and/or mesophilic anaerobic digestion systems. …
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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
… polymeric substances (EPS) in activated sludge are known to account for the flocculent nature of activated sludge. Extensive studies over the last few decades have attempted to extract and characterize activated sludge EPS, but a lack of agreement between studies has also been quite …
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Wastewater treatment and energy : an analysis on the feasibility of using renewable energy to power wastewater treatment plants in Singapore
… during methane gas combustion was computed given sludge output at BJ725. The outcome of these calculations showed mixed results. There was not one day of wind strong enough to produce usable energy in the 33-year meteorological dataset analyzed. Thus, there is essentially no potential for wind …
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Impact of metallic nanoparticles on anaerobic digestion
… wastewater treatment. In batch anaerobic digestion systems, AgNPs at the concentration of 40 mg/L did not inhibit methane production, as more than 90% of AgNPs were removed from the liquid to the associated sludge while almost no silver ions were released from AgNPs under anaerobic sludge …
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Elimination organischer Spurenstoffe aus kommunalem Abwasser
… rates, as well as different affinity to sewage sludge. The behaviour of the model trace pollutants during the mechanic-biological treatment of wastewater and sewage sludge was studied in pilot wastewater treatment plants and in laboratory sorption and degradation experiments with radiolabelled …
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Fate and Impacts of Contaminants of Emerging Concern during Wastewater Treatment
… and tetracycline to various lab-scale sludge digestion processes were examined, and factors that drove the response of ARGs were discussed. Mesophilic anaerobic digestion significantly reduced sulI, sulII, tet(C), tet(G), and tet(X) with longer solids retention time (SRT) exhibiting a …
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Secondary Municipal Wastewater Treatment Using the UASB/Solids Contact Technology
… both a pretreatment unit and a waste activated sludge digestion system. The results indicate that the UASB reactor has a TSS removal efficiency of about 37%. Of the solids removed by the unit, 33% were degraded by the action of microorganisms, and 4.6% were accumulated in the reactor. The …
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Investigation of Biotransformation of 6:6 PFPiA into C6 PFPA during Anaerobic Digestion of Sludge
… models, but not in wastewater treatment plant sludge. This is concerning since the toxicity and general research into PFPiAs and PFPAs is lacking and biosolids, a by-product of sludge treatment, is used as fertilizer for commercial crops. The purpose of this experiment is to fill in this void …
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Development of a headspace solid-phase microextraction (HS-SPME) procedure for the determination of short-chain fatty acids (SCFAs) in activated sludge by GC-FID
… materials, phosphorus, and nitrogen. Activated sludge, containing a variety of living organisms, is added into the wastewater treatment system. Short-chain fatty acids (SCFAs), an energy source of the bioorganisms, are produced during activated sludge digestion, and play a significant role in …
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Light Enhanced Toxic/tumorigenic Potential of Trinitrotoluene (Tnt) and Analogs
… The production of 2A and 4A by activated sludge digestion and/or other biota in the environment must be considered since these metabolites can be more toxic than TNT. Female rats can more effectively metabolize TNT than males and the observation of cancer only in female rats could be the …
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Performance of Acid-Gas Anaerobic Digestion for Minimization of Siloxane and Hydrogen Sulfide Produced in Biogas for Energy Recovery
… treatment facilities. During anaerobic sludge digestion, these compounds volatilize and enter the methane gas recovery stream. As the methane is combusted for energy cogeneration, these compounds become oxidized to microcrystalline silicon dioxide and cause damage and potential failure …
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The Construction and Evaluation of a Water Reclamation Kit Prototype for Isolated Application
… clarification, flow equalization, aerobic sludge digestion and activated carbon adsorption effluent quality of 30 mg/l COD and SS was considered adequate for recycle.</p> <p>During evaluation the prototype met the effluent criteria at all times. The solids removal efficiency of the floating …
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Enhanced Microbial Activity and Energy Conservation through Pneumatic Mixing in Sludge Systems
… in two types of aerated systems (activated sludge and aerobic sludge digestion) and to decrease overall energy consumption. Aerated treatment systems are very important in the treatment of wastewaters and management of sludges. The activated sludge process is widely used to treat wastewater …
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Prevalence and fate of Clostridium difficile during sewage treatment, land application and composting
… from primary and digested municipal sewage sludge along with biosolids, effluent and sediments from a local water shed. Genotypes of toxigenic C. difficile were identified by PCR ribotyping, toxinotyping, and pulsed field gel electrophoresis (PFGE). C. difficile was isolated from 92% …
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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
… carbapenem resistance genes (CRGs) accumulate 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 …
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The Effect of Steady-State Digestion Temperature on the Performance, Stability, and Biosolids Odor Production associated with Thermophilic Anaerobic Digestion
… and stability of a thermophilic anaerobic digestion system are inherently dependent on the engineered environment within each reactor. While the selection of operational parameters such as mixing, solids retention time, and digestion temperature are often selected on the basis of certain …
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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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