Results 221 to 230 of about 72,213 (262)

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

The Use of Ultrasonics in the Treatment of Waste Activated Sludge

Chinese Journal of Chemical Engineering, 2006
Abstract The present paper reports on extensive investigations using an ultrasonic treatment of WAS, to study its potential to meet one or all of four objectives: (1) reduce WAS quantities; (2) achieve a better dewaterability; (3) provoke a release of COD from the biosolids, preferably transformed into biodegradable organics and (4) possibly destroy ...
Dewil, Raf, Baeyens, Jan, Goutvrind, Rebecca   +2 more
openaire   +2 more sources

Closed cycle of recycling of waste activated sludge

Waste Management, 2018
The 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, Abigail Parra Parra, Pedro Antonio Márquez Aguilar, Ariadna Trujillo Estrada, Veronica González Molina, Mykola Kakazey, Tamara Tomila, Virginia Gómez-Vidales   +7 more
openaire   +2 more sources

Dewaterability of waste activated sludge with ultrasound conditioning

Bioresource Technology, 2009
This 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, Jinchuan, Deng, Hengyi, Lei, Tao, Bai, Qingjuan, Fan, Zhaoxu, Li   +5 more
openaire   +2 more sources

Hydrolysis and acidification of waste activated sludge at different pHs

Water Research, 2007
The effect of pH from 4.0 to 11.0 on the hydrolysis and acidification of waste activated sludge (WAS) was investigated. Experimental results showed that at room temperature the sludge hydrolysis was in the following order: alkaline>acidic>(neutral and blank test), and between pH 6.0 and 11.0 the sludge hydrolysis increased with pH.
Yinguang Chen, Su Jiang, Guowei Gu
exaly   +3 more sources

Enzyme activities in waste water and activated sludge

Water Research, 1992
Abstract The purpose of the present study was to evaluate the potential of selected enzyme activity assays to determine microbial abundance and heterotrophic activity in waste water and activated sludge. In waste water, esterase and dehydrogenase activities were found to correlate with microbial abundance measured as colony forming units of ...
Ole Nybroe, Per Elberg Jørgensen, Mogens Henze   +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

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

A FUZZY CONTROLLER FOR ACTIVATED SLUDGE WASTE WATER PLANTS

Annual Review in Automatic Programming, 1994
Abstract A concept of control for municipal waste water treatment plants is developed. The used fuzzy approach to real-time control aims at an operation of the plant that guarantees satisfactory performance of cleaning in different situations of load.
Jens Alex, Ulrich Jumar, R. Tschepetzki
openaire   +1 more source

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