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Uemura, S., Suzuki, S., Abe, K., Ohashi, A., Harada, H., Ito, M., Imachi, H., Tokutomi, T.. (1389). Partial Nitrification in an Airlift Activated Sludge Reactor with Experimental and Theoretical Assessments of the pH Gradient inside the Sponge Support Medium. , 5(1), 33-40. doi: 10.22059/ijer.2010.288
S. Uemura; S. Suzuki; K. Abe; A. Ohashi; H. Harada; M. Ito; H. Imachi; T. Tokutomi. "Partial Nitrification in an Airlift Activated Sludge Reactor with Experimental and Theoretical Assessments of the pH Gradient inside the Sponge Support Medium". , 5, 1, 1389, 33-40. doi: 10.22059/ijer.2010.288
Uemura, S., Suzuki, S., Abe, K., Ohashi, A., Harada, H., Ito, M., Imachi, H., Tokutomi, T.. (1389). 'Partial Nitrification in an Airlift Activated Sludge Reactor with Experimental and Theoretical Assessments of the pH Gradient inside the Sponge Support Medium', , 5(1), pp. 33-40. doi: 10.22059/ijer.2010.288
Uemura, S., Suzuki, S., Abe, K., Ohashi, A., Harada, H., Ito, M., Imachi, H., Tokutomi, T.. Partial Nitrification in an Airlift Activated Sludge Reactor with Experimental and Theoretical Assessments of the pH Gradient inside the Sponge Support Medium. , 1389; 5(1): 33-40. doi: 10.22059/ijer.2010.288

Partial Nitrification in an Airlift Activated Sludge Reactor with Experimental and Theoretical Assessments of the pH Gradient inside the Sponge Support Medium

International Journal of Environmental Research
مقاله 4، دوره 5، شماره 1، فروردین 2011، صفحه 33-40    اصل مقاله (854.72 K)
شناسه دیجیتال (DOI): 10.22059/ijer.2010.288
نویسندگان
S. Uemura* 1؛ S. Suzuki2؛ K. Abe3؛ A. Ohashi4؛ H. Harada5؛ M. Ito6؛ H. Imachi7؛ T. Tokutomi8
1Department of Environmental Engineering, Kisarazu National College of Technology 2-11 Kiyomidaihigashi, Kisarazu, Chiba 292-0041, Japan
2Nippon Steel Kankyo Engineering Co. Ltd., Chiba, Japan
3Nagaoka University of Technology, Niigata, Japan
4Hiroshima University, Hiroshima, Japan
5Tohoku University, Miyagi, Japan
6Ebara Jitsugyo Co. Ltd., Tokyo, Japan
7Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
8Kurita Water Industries Ltd, Tochigi, Japan
چکیده
An airlift-type activated sludge reactor using a sponge support medium was fed with wastewater containing 500 mg-N/L of NH4 +-N. In order to establish partial nitrification, the reactor was kept at 35°C. Moreover, the reactor was started up with the NaHCO3 solution as an alkali agent to supply inorganic carbon for enhancement of partial nitrification. The partial nitrification was established during the period when NaHCO3 was used as an alkali agent. However, soon after changing the alkali agent to a mixture of Na2HPO4 and NaOH, the production of NO2 --N started to decrease. The change in pH inside the sponge medium revealed by the model simulation and microelectrode study showed relatively high free ammonium concentration inside the medium. Thus, partial nitrification was proved to be affected by inorganic carbon in the alkali agent. Furthermore, it was suggested that the establishment of partial nitrification in this study was due to the combination of high operating temperatures, addition of inorganic carbon, and the inhibition of NOB by the free ammonium concentration.
کلیدواژه‌ها
Nitrite accumulation؛ Sponge cube؛ Microelectrode؛ pH gradient؛ Model simulation
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