Title: The influence of aeration rate on partial nitrification in sequencing batch reactor

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.

DOI: 10.1504/IJEP.2009.026661

International Journal of Environment and Pollution, 2009 Vol.38 No.1/2, pp.193 - 202

Published online: 22 Jun 2009 *

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