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Evaluation of CIA(Conventional Intermittent Aeration) and MIA(Modified Intermittent Aeration) in Membrane Submerged Advanced Wastewater Treatment Process  

Seo, In-Seok (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Yeon-Kwon (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Ji-Yeon (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Hong-Suck (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Byung-Goon (한국수자원공사 수자원연구원 상하수도연구소)
Choi, Chang-Gyu (한국수자원공사 수자원연구원 상하수도연구소)
Ahn, Hyo-Won (한국수자원공사 수자원연구원 상하수도연구소)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.2, 2006 , pp. 257-264 More about this Journal
Abstract
In this study, the treatment of domestic wastewater in a field-scale membrane submerged intermittently aerated activated sludge process($210m^3/day$) was investigated under difference aeration methods. Operating temperature was 5.4 to 25.0 and membrane used in this study is a polyethylene hollow fiber membrane(pore size $0.4{\mu}m$). The range of operating flux was $9.7{\sim}24.4l/m^2-h$ and membrane permeates periodically operated for 7min followed idle for 3 min. The results showed that MIA(modified intermittent aeration) was more efficient in nitrogen and phosphorus removal. The removal efficiencies of T-N and T-P were 73.0% and 69.6% for CIA(conventional intermittent aeration) and 57.5%, 58.6% for MIA (modified intermittent aeration). With application of modified intermittent aeration, DO reached nearly Omg/l within 10 minutes after air off. Organics of influent could be entirely consumed to the denitrification and the P-release without the influence by remained DO in intermittent aeration reactor. Therefore, newly developed KSMBR(Kowaco-KMS-Ssangyoung Membrane Bio-Reactor) process with modified intermittent aeration can be one of the useful process for stable nitrogen and phosphorus removal.
Keywords
Intermittent aeration; Membrane bio-reactor(MBR); Nitrification; Denitrification; ASM (Activated Sludge Models);
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