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Enhancing waste activated sludge dewaterability by reducing interaction energy of sludge flocs
Environmental Research, 2021How to efficiently improve waste activated sludge (WAS) dewaterability is a common challenge in WAS treatment and management throughout world. The interaction energy of sludge flocs is of great importance for sludge dewaterability. In this study, the relationship among the repulsive force of sludge flocs, hydrophilic/hydrophobic characteristics of ...
Wenbo Yu +11 more
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Benthal stabilization of waste activated sludge
Water Research, 1982Abstract Laboratory studies were performed on the stabilization of waste activated sludge solids in a deposit formed at the bottom of an aerated water column. Conclusions reached were as follows: (1) As long as dissolved oxygen is maintained in the water column, the benthal process is stable and odor free. (2) At temperatures within the range of 20 ±
L.G Rich, B.W Connor
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Ultrasonic treatment of waste activated sludge
Environmental Progress, 2006AbstractActivated sludge processes are key technologies to treat wastewater. These biological processes produce huge amounts of waste activated sludge (WAS), now commonly called biosolids. Mechanical, thermal, and/or chemical WAS conditioning techniques have been proposed to reduce the sludge burden.
Dewil, Raf +2 more
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Closed cycle of recycling of waste activated sludge
Waste Management, 2018The recycling of waste activated sludge (WAS) formed in the process of biological purification of sewage is an urgent ecological problem. In the present work, two ways of recycling of WAS containing from 8 to 30% free water, namely, the synthesis of a carbon-containing component and synthesis of porous building ceramics (bricks) with the use of WAS and
Marina Vlasova +7 more
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Anaerobic co-digestion of oil refinery waste activated sludge and food waste
Environmental technology, 2021The technology of anaerobic co-digestion to treat the excess biological sludge discharged from activated sludge systems in oil refineries was evaluated in bench scale experiments. Mixing food waste rich in fruits and vegetables with this sludge increased
Tayane Miranda Silva de Castro +2 more
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Bench-scale ozonation study of waste activated sludge
Journal of Environmental Science and Health, Part A, 2009A bench-scale ozonation study was conducted on waste activated sludge (WAS) in a 10-L, clear PVC, semi-batch, bubble column reactor. Two separate runs were performed on 5-L samples of WAS obtained from the Rocky Creek Wastewater Treatment Plant (WWTP) in Macon, Georgia.
Richard O, Mines, Laura W, Lackey
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Rheological characterization of thermal hydrolysed waste activated sludge
Water Research, 2019Rheological properties are important in the design and operation of sludge-handling process. Despite this, the rheology of sludge in thermal hydrolysis processes (TH) is not well described. In-situ measurements were performed to characterize the flow behaviour of various concentrations (7-13 wt%) of waste activated sludge (WAS) at TH conditions ...
Kevin Hii +4 more
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Dewaterability of waste activated sludge with ultrasound conditioning
Bioresource Technology, 2009This study investigated the potential benefits of ultrasound-conditioned sludge dewatering treatments with specific energy dosages from 0 to 35,000 kJ/kg total solids (TS). Capillary suction time (CST) and specific resistance of filtration (SRF) were used to evaluate sludge dewaterability.
Xin, Feng +5 more
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Bulking of dairy waste activated sludge
Water Research, 1968Abstract The phenomenon of bulking of a dairy waste activated sludge was studied in relation to known and estimated data concerning two types of microorganisms involved in the mechanism of bulking, viz. Sphaerotilus and Arthrobacter -like bacteria.
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Anaerobic bioleaching of metals from waste activated sludge
Science of The Total Environment, 2015Heavy metal contamination of anaerobically digested waste activated sludge hampers its reuse as fertilizer or soil conditioner. Conventional methods to leach metals require aeration or the addition of leaching agents. This paper investigates whether metals can be leached from waste activated sludge during the first, acidifying stage of two-stage ...
Roel J.W. Meulepas +5 more
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