CHEMOAUTOTROPHIC NITRIFICATION AND DENITRIFICATIN BY AIR- AND HYDROGEN-BASED HOLLOW-FIBER MEMBRANE BIOFILM REACTOR
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 during 190 days. NH4-N removal efficiencies ranging from 95% to 97% were achieved at NH4-N concentrations of influent in range from 50 to 100 mgN/L. When gucose was added in influent, the simultaneous nitrification and denitrification were 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 was occurred and the removal rates achieved in this study were 23 ~ 58 mgN/m2·d. In this study, the achieved removal efficiency was some low than other study findings, however, the result suggested that this hybrid HfMBR system can be used effectively for nitrogen removal in the oligotrophic water.
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Document Type: Research Article
Publication date: 2005-01-01
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