Results 201 to 210 of about 71,385 (248)

Waste-Activated Sludge Treatment Processes

2020
Biological processes are the most common methods to treat wastewater but they produce huge amounts of waste-activated sludge (WAS) as a by-product. WAS generated during wastewater treatment must be stabilized sufficiently prior to ultimate disposal. The most common methods of sludge stabilization are biological processes (aerobic or anaerobic digestion)
Chin Heng Gan, Siew Hoong Shuit
openaire   +1 more source

Conditioning, Filtering, and Expressing Waste Activated Sludge

Journal of Environmental Engineering, 1999
In this study, the applied liquid pressure was used to characterize the rate and extent of activated sludge dewatering in the expression phase. By characterizing the liquid pressure, three important features of expression phase dewatering were determined.
Novak, J. T., Agerbæk, M., Sørensen, B. L., Hansen, J. Aa.   +3 more
openaire   +2 more sources

Predicting the Degradability of Waste Activated Sludge

Water Environment Research, 2008
The objective of this study was to identify methods for estimating anaerobic digestibility of waste activated sludge (WAS). The WAS streams were generated in three sequencing batch reactors (SBRs) treating municipal wastewater. The wastewater and WAS properties were initially determined through simulation of SBR operation with BioWin (EnviroSim ...
Richard, Jones, Wayne, Parker, Henry, Zhu, Dwight, Houweling, Sudhir, Murthy   +4 more
openaire   +2 more sources

Oxidation and ozonation of waste activated sludge

Journal of Environmental Science and Health, Part A, 2008
In this bench-scale study, the treatment of waste activated sludge (WAS) was evaluated using aerobic digestion and ozonation. Two, 2-L batch digesters, one aerated and the other one ozonated, were operated for 30 days in each phase of the study. The aerated digester simulated the aerobic digestion process and served as control to the ozonated digester.
Richard O, Mines, C Brett, Northenor, Mitchell, Murchison   +2 more
openaire   +2 more sources

Anaerobic Digestion of Waste Activated Sludge

Journal of the Environmental Engineering Division, 1982
The purpose of this laboratory study was to evaluate, and model the effect of solids retention time in the activated sludge process (θ\N\dc\uA\uS) on the performance of anaerobic digesters fed the resulting waste sludges. Activated sludge systems were operated over a range of θ\N\dc\uA\uS values, with the waste sludges used as feed sources for batch ...
James M. Gossett, Roy L. Belser
openaire   +1 more source

Aerobic Digestion of Waste Activated Sludge

Journal of the Environmental Engineering Division, 1979
Activated sludge that had been grown on a completely soluble wastewater in a pilot plant was subjected to aerobic digestion in batch, lab-scale reactors. During the course of digestion, destruction of nonvolatile solids occured so that is was preferable to express the kinetics of digestion upon the loss of total suspended solids rather than volatile ...
C. Scott Reece, C. P. Leslie Grady, Ralph E. Roper   +2 more
openaire   +1 more source

New sludge pretreatment method to improve dewaterability of waste activated sludge

Bioresource Technology, 2011
The enhancements of electrolysis-pretreated conditioning were investigated in this study. Normalized capillary suction time (CST) was used to evaluate sludge dewaterability. Extracellular polymeric substance (EPS) concentration, viscosity and scanning electron microscopy (SEM) were determined to explain the observed changes in conditioning process.
Hai-ping, Yuan, Xiao-bo, Cheng, Shan-ping, Chen, Nan-wen, Zhu, Zhen-ying, Zhou   +4 more
openaire   +2 more sources

Enhancing waste activated sludge dewaterability by reducing interaction energy of sludge flocs

Environmental Research, 2021
How 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, Yanlei Wan, Yu Wang, Yuwei Zhu, Shuangyi Tao, Qi Xu, Keke Xiao, Sha Liang, Bingchuan Liu, Huijie Hou, Jingping Hu, Jiakuan Yang   +11 more
openaire   +2 more sources

Benthal stabilization of waste activated sludge

Water Research, 1982
Abstract 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
openaire   +1 more source

Ultrasonic treatment of waste activated sludge

Environmental Progress, 2006
AbstractActivated 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, Baeyens, Jan, Goutvrind, Rebecca   +2 more
openaire   +2 more sources