Effect of chromium(VI) on the biomass yield of activated sludge

Date

1999-07-15

Author

Yetiş, Ülkü
Gokcay, CF

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Effect of 1-25 mg/l of influent Cr(VI) concentrations on true biomass yield (Y-t) and decay coefficient (k(d)) of activated sludge units was investigated in this study. To this purpose, completely mixed, once-through laboratory scale activated sludge units with acclimated cultures were operated. After obtaining dilute-out curves for each Cr(VI) concentration, the values of Y-t and k(d) were determined. The results revealed that presence of Cr(VI) caused stimulatory effects on biomass yield and maintenance up to the Cr(VI) concentration of 25 mg/l. Lower Cr(VI) concentrations exerted higher stimulation of the system. Extended oxidation due to the presence of Cr(VI) and/or increased synthesis of cellular material due to the stimulatory effects of Cr(VI) were thought to be the mechanisms of the observed stimulation. (C) 1999 Elsevier Science Inc. All rights reserved.

Subject Keywords

Activated sludge, Biomass yield, Cr(VI), Maintenance, Stimulation

URI

https://hdl.handle.net/11511/38126

Journal

ENZYME AND MICROBIAL TECHNOLOGY

DOI

https://doi.org/10.1016/s0141-0229(99)00013-7

Collections

Department of Environmental Engineering, Article

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Citation Formats

Ü. Yetiş and C. Gokcay, “Effect of chromium(VI) on the biomass yield of activated sludge,” ENZYME AND MICROBIAL TECHNOLOGY, pp. 48–54, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38126.