Authors: Weiwei Wu, Li Cong, Jianlong Wang
Addresses: Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China. ' Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18, Shuang Qing Road, Hai Dian District, Beijing 100085, China. ' Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China
Abstract: Partial nitrification was investigated in Sequencing Batch Reactor (SBR) under aeration of 100, 500, 1000 and 1600 ml min−1. The biomass concentration was about 1.7 g l−1. When the ratio of alkalinity (mg l−1) to NH4 + -N (mg l−1) was 7.14 : 1, pH and DO would both increase dramatically after ammonia oxidation finished. Through monitoring and controlling the variation of pH and DO in the reactor, a stable partial nitrification process could be maintained. During NH4+-N oxidation the fluctuation range of DO was 0.09∼3.70 mg l−1. The NH4+-N removal efficiency and NO4−-N accumulation rate were higher than 97.9% and 99.1%, respectively.
Keywords: partial nitrification; aeration; SBR; sequencing batch reactors; nitrite; biomass concentration.
International Journal of Environment and Pollution, 2009 Vol.38 No.1/2, pp.193 - 202
Published online: 22 Jun 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article