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Effects of hydraulic residence time on metal uptake by activated sludge
Date
2005-01-01
Author
Ozbelge, TA
Özbelge, Hilmi Önder
Tursun, M
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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The combined uptake Of Cu2+ and Zn2+ by activated sludge (biomass) was investigated at steady state in an activated sludge process (ASP) without recycle (namely, once-thro ASP), for different values of influent metal concentrations and hydraulic residence time in the range of 2.5-40 h. The experiments were performed at a constant pH of 7 and temperature of 25 degreesC. The results showed that the percentage removal of both copper and zinc by activated sludge increased with the increasing residence time; moreover, the percent metal uptakes were higher for both metals at the low level of influent metal concentrations [rho(Cu2+) = 1.5 mg/L and rho(Zn2+) = 9 mg/L], than those at the higher level of concentrations [rho(Cu2+) = 4.5 mg/L and rho(Zn2+) = 27 mg/L]. The least represented forms of both Cu2+ and Zn2+ in activated sludge were their sulfides, and the dominant metal forms were found to be 'organically bound' for both of the metals, Zn2+ and Cu2+.
Subject Keywords
Industrial and Manufacturing Engineering
,
Process Chemistry and Technology
,
Energy Engineering and Power Technology
,
General Chemistry
,
General Chemical Engineering
URI
https://hdl.handle.net/11511/51523
Journal
CHEMICAL ENGINEERING AND PROCESSING
DOI
https://doi.org/10.1016/j.cep.2004.04.004
Collections
Graduate School of Natural and Applied Sciences, Article