Journal
BIORESOURCE TECHNOLOGY
Volume 347, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.126684
Keywords
Membrane fouling migration; Fouling layer compression; High pressure dehydration effect; Backwashing strategy
Funding
- National Natural Science Foundation of China [52000137, 42177102]
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An improved UV spectrum in-situ monitoring system was used to investigate membrane fouling behavior in membrane bioreactors (MBRs). The study showed that the formation of a stubborn fouling layer involves the migration and compression of fouling particles on the membrane surface. Furthermore, experiments involving moisture content measurement and ultrasonic thickness measurement confirmed the mechanism of fouling layer compression.
An improved UV spectrum in-situ monitoring system was applied to explore the membrane fouling behavior in membrane bioreactors (MBRs). The changes in absorbance curve illustrated that the formation of a stubborn fouling layer includes the migration and compression of membrane surface foulants. The initial flux negatively correlates with the migration degree (unevenness) of membrane fouling, while fiber length is positively corre-lated. In further experiments, ultrasonic thickness measurement excludes fouling layer compression caused by spatial collapse under external force. Moisture content measurement tests demonstrated that the moisture content changed from 52% to 31% after fouling layer compression, which confirmed that the fouling layer compression is mainly caused by the high pressure dehydration effect . Finally, a membrane backwashing strategy based on fouling layer compression theory indicated that the backwashing process should be carried out at a stage where the accumulation of membrane fouling is constant but the fouling layer is not compressed.
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