A<sup>2</sup>O-MBR工艺中生物泡沫现象原因及其影响研究

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Abstract A full-scale A²O-MBR wastewater treatment plant was investigated to analyze the phenomenon and characteristics of foam (quality/quantity and biological feature) in the oxic tank. Furthermore, the possible causes of foaming, as well as the effects of foaming on the pollutants removal and membrane fouling were elucidated. The results showed a significant progression of the foaming phenomenon, whereby the foam quality/quantity parameters (foam quantity-Scum index, SI^* and foam potential/stabilityFoam power, FP) increased considerably with running time. Also, the foam SI^* and FP values were significantly correlated with the concentrations of total EPS and bound EPS. In addition, the abundance of filamentous bacteria and microbial activity in the foam were notably higher than that in the mixed liquor. Analytically, the formation and stability of foam might be caused by EPS and filamentous bacteria (mainly Microthrix parvicella and Eikelboom 0092type). Nonetheless, the efficiencies of pollutants removal (COD、NH₄⁺-N、TN、TP and turbidity) were found to be free from the negative effects of biological foam. In contrast, membrane fouling was influenced by biological foam to some extent.

Key words： A²O-MBR biological foam extracellular polymeric substance (EPS) filamentous bacteria wastewater treatment

Received: 25 July 2018

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X703

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	YU Zhen-zhen
	HU Yi-song
	WANG Xiao-chang

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YU Zhen-zhen,HU Yi-song,WANG Xiao-chang. Origin and influence of biological foaming phenomenon in an A²O-MBR process for wastewater treatment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1034-1042.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1034

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