Enhanced nitrite build-up in proportion to increasing alklinity/NH4+ ratio of influent in biofilm reactor期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Enhanced nitrite build-up in proportion to increasing alklinity/NH4+ ratio of influent in biofilm reactor

Authors:	Byung-Ho Hwang Kyung-Yub Hwang Eui-So Choi Dae-Ki Choi Jin-Young Jung

Affiliation:	(1) Division of Environment & Process Technology, Korea Institute of Science and Technology, P.O.Box 131, Cheongryang, Seoul, 130-650, Korea;(2) Department of Civil & Environmental Engineering, Korea University, 1-5 Ka, Anam-Dong, Sungbuk-Ku, Seoul, 136-701, Korea

Abstract:	When the alkalinity/NH₄ ⁺ratio increased from 4.1 to 9.4, the ammonium removal rate increased from 45 to 90 mg NO_x-N l^–1 h^–1. An increase in alkalinity/NH₄ ⁺ratio was a major reason for higher pH and free ammonia (FA) concentration in the reactor. The high concentration of FA showed a selective inhibition for Nitrobacter, which caused enhanced nitrite build-up in a biofilm reactor.

Keywords:	alkalinity biofilm biofilter nitrification nitrite build-up
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