膜科学与技术

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Identification and cleaning of key membrane fouling components
for A2OA-MBR in sewage purification plant

Authors： KUANG Ke1, SUN Wei1, DONG Jiahao2, LIN Dachao2, WANG Ziyuan1，DU Xing1

Units： 1. Guangzhou Sewage Puification Co., Ltd., Guangzhou 510627, China; 2. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China

KeyWords： sewage purification plant； membrane bioreactor； membrane fouling component； maintenance cleaning； process optimization

ClassificationCode：TQ028;TU991.2

year,volume(issue):pagination： 2025,45(2):162-172

Abstract：

This study aims to identify the key components for membrane fouling and establish maintenance cleaning strategies for A2OA-MBR in sewage purification plants in southern China. Three membrane bioreactors with different sludge concentration (6 000, 8 000 and 12 000 mg/L) were established and then operated for 60 days. During filtration, membrane cleaning was regularly required. The results indicated that extracellular organic matters from microbial metabolism was the main foulants for membrane fouling, in which protein-like substances were dominant. Owing to the addition of coagulants, inorganic fouling (e.g. aluminum phosphate complexes) was also found in membrane fouling. Regular backwashing based on sodium hypochlorite could remove reversible membrane fouling by oxidation, but irreversible membrane fouling continuously accumulated, forming a dense fouling layer. The exfoliative reversible membrane fouling could be dissolved in concentrate and then accumulated during filtration. The concentration of polysaccharide-like and protein-like substances in concentrate was increased by 42% and 15% when the concentration of NaClO in cleaning solution was increased from 200 to 400 mg/L. With prolonging filtration time, the cleaning efficiency of sodium hypochlorite on membrane fouling was gradually weakened. Membrane fouling developed in bioreactors with more activated sludge was more likely to be removed. The negative influence of cleaning solution on functional bacteria in bioreactors should be avoided.

Funds：

国家自然科学基金资助面上项目(52170070)

AuthorIntro：

匡科（1972-），男，湖南祁东人，博士，正高级工程师，主要研究方向为城镇净水技术

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