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Effects of Alkalinity on the Nitrification Capability of Nonwoven Fabric Filter Bioreactor  

Bae, Min-Su (School of Environmental and Civil Engineering, Inha University)
Ahn, Yoon-Chan (School of Environmental and Civil Engineering, Inha University)
Jang, Myung-Bae (School of Environmental and Civil Engineering, Inha University)
Cho, Yun-Kyung (Department of Civil and Environmental Engineering, University of Wisconsin-Madison)
Cho, Kwang-Myeung (School of Environmental and Civil Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.7, 2007 , pp. 783-792 More about this Journal
Abstract
To investigate the effects of alkalinity on the nitrification capability of the nonwoven fabric filter bioreactor(NFBR), an experiment was performed for 641 days at a hydraulic retention time of approximately 11 hours by changing the influent concentration of $NH_3-N$ from 54 mg/L to 1,400 mg/L and alkalinity from 43 mg/L to 10,480 mg/L. The MLSS concentration reduced from an initial value of 2,650 mg/L down to 830 mg/L, then increased up to 8,340 mg/L. Though the volumetric loading rate varied in a range of $0.120\sim3.130$ kg $NH_3-N/m^3-day$, the F/M ratio showed a narrow range of $0.067\sim0.414$ kg $NH_3-N/kg$ MLSS-day. The average nitrification efficiency at each experimental stage resulted in the range of $35.2\sim100%$, and the maximum nitrification rate was 2.970 kg $N/m^3-day$ or 0.489 g N/g MLVSS-day. The nitrifiers' fraction of the MLVSS increased up to 100% from an initial value of 7.1% and the biofilm formed on the nonwoven fabric filter showed a very low nitrifiers' fraction of mere 2.2%. The growth yield of the MLSS and the alkalinity consumption rate were computed to be 0.117 g VSS/g N removed and 7.08 g alkalinity/g $NO_x^--N$ produced, respectively. Results of the research suggest that NFBR could be an adequate process for nitrification of wastewaters with high ammonia concentrations.
Keywords
Nitrification; Bioreactor; Nonwoven Fabric; Alkalinity; Filtration;
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Times Cited By KSCI : 4  (Citation Analysis)
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