AI Article Synopsis
- The study explored the effectiveness of a new bioflocculant called GemFloc™ in reducing membrane fouling in membrane bioreactors (MBR) during the treatment of municipal wastewater.
- Compared to traditional MBRs, the use of GemFloc™ resulted in lower levels of soluble microbial products (SMP), larger sludge floc sizes, and improved sludge characteristics, leading to less blockages and resistance in the membrane system.
- The addition of GemFloc™ also promoted a more diverse microbial community, with an increase in beneficial fouling-reducing microbes and a decrease in those that contribute to membrane fouling.
Article Abstract
The feasibility of a novel bioflocculant (GemFloc™) for membrane fouling mitigation in membrane bioreactor (MBR) was investigated during real municipal wastewater treatment. When compared to the conventional MBR (CMBR), suspended sludge in the MBR with GemFloc™ (G-MBR) showed less soluble microbial products (SMP), higher ratios of proteins to polysaccharides in SMP (SMP/SMP) and loosely bound extracellular polymeric substances (LB-EPS). Adding GemFloc™ also enlarged floc size (> 200 µm), and increased tightly bound EPS levels, zeta potential and relative hydrophobicity of sludge flocs, further reduced cake layer and pore blocking resistances. Moreover, more diverse microbial community and enrichment of fouling reduction microbes such as Arenimonas and Flavihumibacter were observed in the G-MBR, together with less abundant microbes (e.g. Sphaerotilus and Povalibacter) which could aggravate membrane fouling. Therefore, GemFloc™ has high capability in improving sludge characteristics, mitigating membrane fouling and increasing diversity of special functional bacterial community in MBR.
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| http://dx.doi.org/10.1016/j.biortech.2020.123612 | DOI Listing |
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