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Effects of C/N Ratio on Removal of Organic Matter and Nitrogen in Alternately Intermittently Aerated Nonwoven Fabric Filter Bioreactor  

Ahn, Yun-Chan (School of Environmental & Civil Engineering, Inha University)
Bae, Min-Su (School of Environmental & Civil Engineering, Inha University)
Lee, Jong-Ho (School of Environmental & Civil Engineering, Inha University)
Cho, Yun-Kyung (Department of Civil and Environmental Engineering, University of Wisconsin-Madison)
Cho, Kwang-Myeung (School of Environmental & Civil Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.5, 2005 , pp. 499-506 More about this Journal
Abstract
This study was performed to investigate the effects of influent C/N ratio on the removal of organic and nitrogenous compounds by two nonwoven fabric filter bioreactors. The reactors were alternately aerated at an aeration/nonaeration period ratio of 60 min/60 min, and fed with wastewater only during nonaeration period. The influent C/N ratio (COD/TKN) was gradually reduced from 10 to 2. The influent was prepared by diluting the leachate from a foodwaste treatment facility in I city so that the COD concentration could be about 2,500 mg/L. The C/N ratio of the wastewater was adjusted by adding ammonium chloride. The results of the experiment showed that the COD and BOD concentration of the effluent was $40{\sim}54\;mg/L$ and $1{\sim}4\;mg/L$, respectively at the C/N ratios of $10{\sim}3$, and the effluent SS concentration was always below 2.0 mg/L. The T-N removal efficiencies were 96% or higher at C/N ratios of $10{\sim}5$, but decreased to 83% and 81%, respectively at the C/N ratios of 3 and 2.8. At the C/N ratios of 2.6 and 2, the effluent quality deteriorated due to ammonia toxicity. The fraction of nitrifying microorganism in the reactors increased from 10% to 20% as the C/N ratio decreased from 5 to 2.6. Alkalinity consumed were $3.12{\sim}3.49\;g$ alkalinity/g T-N removed at the C/N ratios of $10{\sim}5$, which are lower than the theoretical value of 3.57. However, the ratio increased to 4.63 and 4.87 g alkalinity/g T-N removed, respectively at the C/N ratios of 3 and 2.8.
Keywords
Biological Nitrogen Removal; Nonwoven Fabric Filter; Nitrification; Denitrification; C/N Ratio;
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