Inhibitory Effects of Simultaneous Chemical Phosphorus Removal on Microbial Activity in the Unitank Process

Zhen Zhou; Ying Chen; Can Xing; Si Wei Chen; Fei Tong; Jun Ru Wang

doi:10.4028/www.scientific.net/AMR.610-613.1672

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 610-613Inhibitory Effects of Simultaneous Chemical...

Inhibitory Effects of Simultaneous Chemical Phosphorus Removal on Microbial Activity in the Unitank Process

Abstract:

Fractionation of heterotrophic bacteria (HB), ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) in a full-scale Unitank wastewater treatment plant (WWTP) were analyzed based on oxygen utilization rate (OUR) test, and the effect of simultaneous chemical phosphorus removal on microbial activity was investigated by adding aluminum sulfate and ferric chloride to activated sludge. Proportions of HB, AOB and NOB in the full-scale Unitank WWTP were 67.0%, 21.0% and 12.0%, respectively. 12.5mg Al³⁺ showed significant inhibition of microbial activity, and inhibitory ratios on HB, AOB and NOB were19.6%, 11.5% and 29.0%, respectively. Nevertheless, the inhibitory ratios of 13.8mg/L Fe³⁺ on HB, AOB and NOB were 4.1%, 5.5% and 4.8%, respectively. Al salt demonstrated much higher inhibitory effects on microbial activities than ferric salt, and the inhibition of Al salt on NOB is dominant in the nitrification process.

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Periodical:

Advanced Materials Research (Volumes 610-613)

Pages:

1672-1675

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.610-613.1672

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Online since:

December 2012

Authors:

Zhen Zhou*, Ying Chen, Can Xing, Si Wei Chen, Fei Tong, Jun Ru Wang

Keywords:

Activated Sludge, Coagulant, Inhibition, Microbial Activity, Unitank

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