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A submerged membrane bioreactor under unprecedentedly short hydraulic retention time enabled by non-woven fabric pre-filtration and electrochemical membrane cleaning

Title
A submerged membrane bioreactor under unprecedentedly short hydraulic retention time enabled by non-woven fabric pre-filtration and electrochemical membrane cleaning
Authors
Chung, C.M.Yamamoto, K.Cho, K.
Date Issued
Dec-2019
Publisher
Elsevier B.V.
Abstract
This study reports that electrochemical oxidation (EO) coupled with non-woven fabric (NWF) filter synergistically mitigated fouling in a submerged membrane bioreactor (MBR) under hydraulic retention time (HRT) of 1 h. Our NWF-EO-MBR was equipped with NWF prefilter cage surrounding microfiltration (MF) membrane with IrO2 anodes in vicinity. Continuous operation showed a retarded increase of transmembrane pressure at intermittent current density (5 mA cm−2) to prolong operation duration by 40% under constant flux (13.75 L m−2 h−1). Primary separation of bio-flocs by NWF not only reduced physically removable fouling on MF, but also allowed augmented concentration of electrolytic free chlorine (FC) near 4.0 mgCl2 L−1 inside the NWF cage. The FC degraded dissolved foulants to reduce physically irremovable hydraulic resistance of MF. A limited nitrification under the short HRT was assisted by electrochemical breakpoint chlorination, resulting 72% total nitrogen removal efficiency on average. Terminal restriction fragment length polymorphism fingerprinting indicated that the microbial community in mixed liquor was less influenced by FC than that in bio-cake on MF. The energy consumption of EO was approximated to 28 Wh per m3 of permeate. © 2019 Elsevier B.V.
URI
http://oasis.postech.ac.kr/handle/2014.oak/100170
ISSN
0376-7388
Article Type
Article
Citation
Journal of Membrane Science, vol. 592, 2019-12
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 CHO, KANGWOO
Div of Environmental Science & Enginrg
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