Inderscience Publishers

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

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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

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