期刊
JOURNAL OF MEMBRANE SCIENCE
卷 592, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2019.117355
关键词
Membrane bioreactor; Fouling; Electrochemical oxidation; Free chlorine; Non-woven fiber
资金
- Nano Material Technology Development Program through the National Research Foundation of Korea [NRF-2016M3A7B4908161]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [10082572]
- Young Researcher Program through the National Research Foundation of Korea [NRF-2019R1C1C1003435]
- Basic Research Laboratory through the National Research Foundation of Korea [NRF-2018R1A4A1022194]
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 Lm(-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 mgCl(2) 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 m(3) of permeate.
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