Anoxic gas recirculation system for fouling control in anoxic membrane reactor
- Authors
- Lee, Hansaem; Lee, Daeju; Hong, Seongwan; Yun, Geum Hee; Kim, Sungpyo; Hwang, Jung Ki; Lee, Woojae; Yun, Zuwhan
- Issue Date
- 1-6월-2014
- Publisher
- SCIENCE PRESS
- Keywords
- fouling; anoxic gas recirculation system; anoxic membrane bioreactor
- Citation
- JOURNAL OF ENVIRONMENTAL SCIENCES, v.26, no.6, pp.1289 - 1293
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ENVIRONMENTAL SCIENCES
- Volume
- 26
- Number
- 6
- Start Page
- 1289
- End Page
- 1293
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/98268
- DOI
- 10.1016/S1001-0742(13)60601-4
- ISSN
- 1001-0742
- Abstract
- Anoxic gas recirculation system was applied to control the membrane fouling in pilot-scale 4-stage anoxic membrane bioreactor (MBR). In the anaerobic-anoxic-anoxic-aerobic flow scheme, hydrophilic polytetrafluoroethylene (PTFE) membrane (0.2 mu m, 7.2 m(2)/module) was submerged in the second anoxic zone. During 8 months operation, the average flux of the membrane was 21.3 L/(m(2).hr). Chemical cleaning of the membrane was conducted only once with sodium hydroxide and sodium hypochlorite. Dissolved oxygen (DO) concentration in the second anoxic zone was maintained with an average of 0.19 +/- 0.05 mg/L. Gas chromatography analysis showed that the headspace gas in the second anoxic reactor was mainly consisted of N-2 (93.0% +/- 2.5%), 02 (3.8% +/- 0.6%), and CO2 (3.0% +/- 0.5%), where the saturation DO concentration in liquid phase was 1.57 mg/L. Atmospheric O-2 content (20.5% +/- 0.8%) was significantly reduced in the anoxic gas. The average pH in the reactor was 7.2 +/- 0.4. As a result, the recirculation of the anoxic gas was successfully applied to control the membrane fouling in the anoxic MBR.
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Collections - Graduate School > Department of Environmental Engineering > 1. Journal Articles
- College of Science and Technology > Department of Environmental Engineering > 1. Journal Articles
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