The operational efficiency and pollution characteristics of a two-stage filtration AnMBR reactor

XIA Zhi-heng; LI Ying-hao; JIANG Zhao; JIA Meng-fei; WANG Hong-chen; QI Lu; LIU Guo-hua

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China Environmental Science ›› 2024, Vol. 44 ›› Issue (11) : 6139-6147.

Water Pollution Control

The operational efficiency and pollution characteristics of a two-stage filtration AnMBR reactor

XIA Zhi-heng, LI Ying-hao, JIANG Zhao, JIA Meng-fei, WANG Hong-chen, QI Lu, LIU Guo-hua

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Abstract

A two-stage filtration AnMBR (F-AnMBR) system was constructed, consisting of a primary filter with polymer filter cloth and a dynamic membrane formed on its surface, along with a secondary filter system utilizing polyvinylidene fluoride (PVDF) ultrafiltration membranes. This system was designed to evaluate its effectiveness in treating low-concentration municipal wastewater. Hydrophilic polyamide filter cloth was selected, featuring an 80μm mesh that effectively intercepts sludge at a flux of 12LMH. Following the formation of the dynamic membrane, the total suspended solids (TSS) interception rate exceeded 88%, indicating its suitability for F-AnMBR applications. The primary filtration significantly enhanced the anti-fouling properties of the AnMBR, with the critical flux of the PVDF ultrafiltration membrane increasing from 6LMH to 12LMH. This improvement was accompanied by a notable reduction in the rate of membrane fouling and an increase in the transmembrane pressure difference. Analyses revealed that the dynamic membrane component reduced membrane fouling substances, such as mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS), and extracellular polymeric substances (EPS) in the membrane pool by over 50%, effectively delaying the formation of the ultrafiltration membrane cake layer contamination. However, the dynamic membrane's ability to intercept soluble microbial products (SMP) was relatively limited, achieving only a 19.34% reduction in soluble protein content, which constrained the overall improvement of gel layer contamination.

Key words

anaerobic membrane bioreactor / dynamic membrane / membrane fouling / municipal wastewater / polymer filter cloth

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XIA Zhi-heng, LI Ying-hao, JIANG Zhao, JIA Meng-fei, WANG Hong-chen, QI Lu, LIU Guo-hua. The operational efficiency and pollution characteristics of a two-stage filtration AnMBR reactor[J]. China Environmental Science. 2024, 44(11): 6139-6147

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