Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20977
Title: Effects of trace levels of copper, chromium, and zinc ions on the performance of activated sludge
Authors: Sin, SN
Chua, H
Lo, WH 
Yu, PHF
Keywords: Activated sludge
Adsorption capacity
Chemical oxygen demand removal
Heavy metals
Sequencing batch reactor
Issue Date: 2000
Publisher: Humana Press
Source: Applied biochemistry and biotechnology, 2000, v. 84-86, p. 487-500 How to cite?
Journal: Applied biochemistry and biotechnology 
Abstract: The effects of copper, chromium, and zinc ions, at trace levels, on the performance of a simulated activated sludge process were investigated. The results of batch adsorption experiments showed that the adsorption of copper, chromium, and zinc ions followed both the Langmuir and Freundlich isotherms. The presence of trace levels of these three metals not only reduced the adsorption rate of organic matters but also the chemical oxygen demand adsorption capacity (CAC) of the activated sludge. Metal ions competed with the organic substrate for adsorption binding sites on the surfaces of activated sludge bioflocs and reduced the CAC. Studies performed in a sequential batch reactor (SBR) showed that the presence of trace levels of heavy metal ions in wastewater affected the SBR performance to different extents depending on the hydraulic retention time (HRT). When the reactors were operated at short HRTs of 2.5 d or less, the presence of trace levels of heavy metal ions reduced substantially the CAC of activated sludge, which, in turn, affected significantly the performance of the SBR. However, under longer HRTs (e.g., 5d), the heavy metal ions in the wastewater reduced the CAC but had no significant effect on the chemical oxygen demand removal efficiency.
URI: http://hdl.handle.net/10397/20977
ISSN: 0273-2289
EISSN: 1559-0291
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