Effect of Media Types on Organics and Nitrogen Removal and Microbial Populations in a Fixed Biofilm Reactor System
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概要
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The effect of media types on organics and nitrogen removal and microbial populations in a fixed biofilm an anaerobic<SUP>-</SUP>, anoxic<SUP>-</SUP>, and aerobic reactor system (AAO process) were studied at two different HRTs. The reactors in the AAO process were packed with two different types of media: a net cross-linked type SARAN media and the other granular type Synthetic Activated Ceramic (SAC) media. The process was applied to treat a wastewater taken from an influent line of 'Janglim' wastewater treatment plant in Korea. At two different HRT of 8.0 hr and 5.2 hr, the AAO process with SARAN media showed 80.2% and 79.8% of COD removal and 70.2% and 72.3% of ammonia nitrogen removal, while the process with SAC media showed 79.8% and 78.1% of COD removal and 90.5% and 85.4% of ammonia nitrogen removal. The microbial population in biofilm formed on SAC media (1.78 ×10<SUP>12</SUP> cells/cm<SUP>2</SUP>) was two orders of magnitude greater in cell number than that of SARAN media (7.80 × 10<SUP>10</SUP> cell/cm<SUP>2</SUP>) . The population ratios of heterotrophs and autotrophs in biofilm on the SARAN media were 0.87-0.88 and 0.12-0.13, respectively, but the ratios on the SAC media were 0.64-0.76 for heterotrophs and 0.24-0.36 for autotrophs. Consequently, the AAO process with SAC media could contain higher biomass concentration and autotrophs/heterotrophs fraction than the process with the SARAN media. The results showed that biological nutrient removal efficiency in a fixed biofilm reactor is deeply influenced by not only operation conditions but also media characteristics and microbial populations in biofilms on the media.
- 日本水処理生物学会の論文
日本水処理生物学会 | 論文
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