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DOI : , Vol.19, No.4, 49 ~ 57, 2011
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| Title |
| Effect of Temperature on Nitrification in MBR and A2/O Process |
| 서인석 In Seok Seo , 김연권 Youn Keon Kim , 김홍석 Hong Suck Kim , 김지연 Ji Yeon Kim |
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| Abstract |
| Biological nitrification-denitrification is a common method of nitrogen removal in domestic wastewater. The process of nitrification is the limiting step in determining the efficiency of the nitrogen removal. The primary organisms responsible for nitrification in activated sludge are the autotrophs such as Nitrosomonase and Nitrobacter. In this research, the effect of temperature on nitrification was evaluated. Nitrification process was strongly dependent on temperature. The inhibitory effect of decreased temperature was greater for Nitrosomonase than for Nitrobacter. Also, relationship between temperature and ammonia nitrogen removal rate was linear, but, in case of nitrate formation, it was exponential. The temperature coefficient(b) was 0.0986 and similar with other researcher. In real plant operation(22,000㎥/day, A2/O process), the same pattern of temperature effect on nitrification was observed. Especially, although temperature was same range, due to difference in population of nitrifying microorganism, the greater effect was observed at moving period from winter to spring than from fall to winter. Temperature and ML(V)SS concentration in design of nitrification reactor should be considered as a key parameter. Also, operating strategies like as increase of biomass concentration and aerobic mass fraction at low temperature of less than 12℃ should be properly utilized. |
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| Key Words |
| Nitrification, Temperature, Specific nitrification rate, Temperature coefficient |
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