Results 191 to 200 of about 1,804,647 (233)
Some of the next articles are maybe not open access.
The Use of Ultrasonics in the Treatment of Waste Activated Sludge
Chinese Journal of Chemical Engineering, 2006Abstract 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 +2 more
openaire +2 more sources
Conditioning, Filtering, and Expressing Waste Activated Sludge
Journal of Environmental Engineering, 1999In 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. +3 more
openaire +2 more sources
Hydrolysis and acidification of waste activated sludge at different pHs
Water Research, 2007The 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.
Su Jiang, Yinguang Chen, Guowei Gu
exaly +3 more sources
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
openaire +2 more sources
Enzyme activities in waste water and activated sludge
Water Research, 1992Abstract 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 +2 more
openaire +1 more source
New sludge pretreatment method to improve dewaterability of waste activated sludge
Bioresource Technology, 2011The 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 +4 more
openaire +2 more sources
A FUZZY CONTROLLER FOR ACTIVATED SLUDGE WASTE WATER PLANTS
Annual Review in Automatic Programming, 1994Abstract 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 +2 more sources
Waste-Activated Sludge Treatment Processes
2020Biological 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
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
openaire +1 more source
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
openaire +2 more sources