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Showing 1 to 20 of 43 for “"Waste-activated sludge"”.
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Processing and disposal of waste activated sludge
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Processing and disposal of waste activated sludge
Typescript, etc.
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Enhanced anaerobic digestion of combined wastewater sludges through solubilization of waste activated sludge
… co-digestion of combined primary and secondary sludges was performed, using a low-level alkaline solubilization process for the secondary sludge. Research was conducted in two phases: the first phase investigated chemical dosages of calcium hydroxide and sodium hydroxide and mechanical mixing …
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Separation of added-value products from waste activated sludge and complex aqueous streams.
La presencia de biomoléculas comercialmente valiosas es un factor común en efluentes de distintas actividades industriales o de gestión medioambiental. Sin embargo, a pesar de la creciente importancia de los sistemas circulares de gestión de residuos, la mayor parte del valor de las aguas …
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Aerobic digestion of waste activated sludge from biological nutrient removal activated sludge systems
Waste activated sludge (WAS) is a biological sludge that contains biodegradable and non-biodegradable volatile suspended solids (VSS) and non-volatile inorgainic suspended solids (ISS). Stabilization for safe disposal of the WAS is a process of paramount importance at wastewater treatment plants …
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Principles and techniques for conditioning of waste-activated sludge by direct slurry freezing
… and recovery of by-products from industrial wastes. In this investigation the direct slurry freeze conditioning of waste-activated sludge was studied, and it was shown that it produces a considerable improvement in dewatering. Dewatering characteristics were adequately defined by the specific …
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Anaerobic Digestion Steady State model parameter estimation for determination of waste activated sludge characteristics
… At present, most P is lost due to runoff or wastewater (WW) effluent and ending up in rivers and oceans. In order to recycle P and other nutrients, Wastewater Treatment Plants (WWTPs) will need to be converted to Water and Resource Recovery Facilities (WRRFs). However, for WRRFs to be …
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Pre-treatment and anaerobic codigestion of waste activated sludge from a petrochemical wastewater treatment plant
During the aerobic treatment of wastewater, waste activated sludge (WAS) is generated which requires further treatment. The typical treatment method applied for treating the sludge is incineration. The National Environmental Management: Air Quality Act (NEM:AQA), promulgated in 2004, was amended in …
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The removal of nitrogen and phosphorus in anoxic-aerobic digestion of waste activated sludge from biological nutrient removal systems
Biological nutrient removal (BNR) activated sludge systems (designed and operated with an additional function of biologically removing nitrogen and phosphorus) produce a waste activated sludge (WAS) that is rich in nitrogen (N) and phosphorus (P). When digested, this nitrogen and phosphorus are …
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Thermal hydrolysis and thermal alkaline pretreatment of waste activated sludge: comparison of effects on biogas yield, dewaterability, sludge liquor and cost-benefit analysis
… (TAP) and thermal hydrolysis (TH) of waste activated sludge (WAS) on biogas yield increase, dewatering potential of digestate, return load increase and refractory COD using same sludge. Moreover, it was intended to compare economic viability of TAP and TH for an individual wastewater …
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Dewatering Of Biosolids By Sodium Ferrate
… form of ferrate for dewatering of biosolids from wastewater treatment facilities. Two different ferrate products prepared using calcium hypochlorite and sodium hypochlorite were used. Samples of anaerobic digested sludge and waste activated sludge with solids content of 2.1% and 0.95 %, …
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Aerobic digestion of trickling filter humus
… 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 to 38 days. Various water quality parameters were monitored during the three digestion runs of trickling filter humus, one …
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The effect of different sludge pretreatment methods on mitigation of anaerobic digester foaming
In this study, waste activated sludge obtained from two full-scale treatment plants with foaming issues was pretreated with acid/alkali treatment, acid-phase fermentation, thermal treatment, sonication, and metal salt treatment to investigate their effect on foam mitigation. The major foam forming …
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The development of a three phase plant-wide mathematical model for sewage treatment
… methods for the design and operation of wastewater treatment plants, for minimization of energy consumption and cost 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 …
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Secondary Municipal Wastewater Treatment Using the UASB/Solids Contact Technology
… and aerobic post-treatment of municipal wastewater is being used more frequently. Recent investigations in this field using an AFBR/aeration chamber combination demonstrated the technical feasibility of this process. The investigation presented herein describes the use of a combined …
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Comparative study of sludge dewatering and thickening characteristics for biological phosphorus removal process and conventional activated sludge process sludges
Due to the unpredictable nature of sludges, it is imperative to test a sludge from every new process in order to design the sludge handling equipment properly. In this study, sludge from the Virginia Initiative Plant, a pilot scale unit employing the UCT biological nitrogen and phosphorus removal …
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The effects of pH on aerobic sludge digestion
… 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 constant …
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The effects of aerobic digestion on centrifugation
… this investigation 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 …
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Anaerobic co-digestion of municipal solid waste and sewage sludge.
As a solution to the problems of municipal solid waste management, anaerobic digestion possesses the optimal combination of volume reduction, probability of success and potential for both energy and resource recovery. An innovative application of anaerobic processes is the co-digestion of sewage …
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The effect of a large anoxic mass fraction and concentrations of nitrate and nitrite in the primary anoxic zone on low f/m filament bulking in nutrient removal activated sludge systems
… with the compaction and settling of the activated sludge either by producing a very diffuse floe structure or by causing bridging between floes. This results in a sludge with poor settleability i.e., low settling velocity and low solids concentration in the return activated sludge (RAS). …
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