title: Feasibility study on the removal of nitrous compounds with a hollow-fiber membrane biofilm reactor.
abstract: The objective of this study was to develop an integrated nitrogen treatment system using autotrophic organisms. A treatment system consists of an aerobic hollow-fiber membrane biofilm reactor (HfMBR) and anaerobic HfMBR. In the aerobic HfMBR, a mixture gas of air and O2 was supplied through the fibers for nitrification. Denitrification occurred in the anaerobic HfMBR using H2 as the electron donor. The treatment system was continuously operated for 190 days. NH4-N removal efficiencies ranging from 95% to 97% were achieved at NH4-N concentrations of influent ranging from 50 to 100 mg N/L. When glucose was added to the influent, the simultaneous nitrification and denitrification occurred in the aerobic HfMBR, and nitrogen removal rates were changed according to the COD/NH4-N ratio of influent. In the anaerobic HfMBR, autotrophic denitrification using H2 occurred and the removal rates achieved in this study were 23-58 mg N/m2 d. In this study, the achieved removal efficiency was lower than other study findings; however, the result suggested that this hybrid HfMBR system can be used effectively for nitrogen removal in oligotrophic water.
authors: Water Environment and Remediation research Centre, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-Ku, Seoul 136-791, Korea. sjh1106@kist.re.kr
authors: J H
authors: JH
authors: Shin
authors: B I
authors: BI
authors: Sang
authors: Y C
authors: YC
authors: Chung
authors: Y K
authors: YK
authors: Choung
mesh_terms: D000332:Aerobiosis; D000388:Air; D000693:Anaerobiosis; D018441:Biofilms; D019149:Bioreactors; D006859:Hydrogen / Q000737:chemistry; D008567:Membranes, Artificial; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism; D009574:Nitro Compounds / Q000302:isolation & purification*; D009584:Nitrogen / Q000302:isolation & purification; D010100:Oxygen / Q000737:chemistry; D013997:Time Factors; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
chemical_list: D008567:Membranes, Artificial; D009573:Nitrites; D009574:Nitro Compounds; D006859:Hydrogen; D009584:Nitrogen; D010100:Oxygen