Origin and influence of biological foaming phenomenon in an A2O-MBR process for wastewater treatment
YU Zhen-zhen, HU Yi-song, WANG Xiao-chang
Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China
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.
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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. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1034-1042.
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