Comparison of ferric chloride and aluminum sulfate on phosphorus removal and membrane fouling in MBR treating BAF effluent of municipal wastewater

Journal of Water Reuse and Desalination

Feng, Qilan¹  Liu, Fangfang²  Liu, Aimin²  Liu, Yali²  Li, Xin² 

[1] Grandblue Environment Co. Ltd, Foshan 528200, China and Guangdong Provincial Key Laboratory of Urban Water Cycle and Water Quality Security Technology, Foshan 528200, China;School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China

关键词: aluminum sulfate;    ferric chloride;    membrane fouling;    phosphorus removal;   

DOI  :  10.2166/wrd.2016.151

学科分类：工程和技术（综合）

来源: IWA Publishing

【 摘 要 】

A membrane bioreactor (MBR) was used for treating biological aerated filter effluent in a municipal wastewater plant, and chemical phosphorus removal was accomplished in the MBR. The results showed that ferric chloride of 20 mg/L and aluminum sulfate of 30 mg/L were the optimal dosages for total phosphorus (TP) removal, and the TP removal efficiency was over 80%. In long-term continuous operations, both ferric chloride and aluminum sulfate effectively mitigated membrane fouling, with the corresponding growth rate of transmembrane pressure decreased to 0.08 and 0.067 kPa/d, respectively. Sludge particle sizes analysis demonstrated that the decrease of particle sizes lower than 50 μm was the main reason for membrane fouling control. Simultaneously, the proteins and polysaccharide (PS) concentrations in the MBR supernatant were analyzed, and the PS concentration significantly decreased to 2.02 mg/L at aluminum sulfate of 30 mg/L, indicating the flocculation of aluminum sulfate on PS was the main reason for mitigation of membrane fouling.

【 授权许可】

CC BY-NC-ND