Journal of Food, Agriculture and Environment

Simultaneous nitrification and denitrification at variable C/N ratio in aerobic granular sequencing batch reactors

Author(s):

Qian Feng ^{1, 2*}, Jia-sun Cao ^{1, 2}, Li-Na Chen ³, Chen-Yuan Guo ⁴, Jun-yi Tan ⁵, Hui-lian Xu ⁶

Recieved Date: 2011-04-10, Accepted Date: 2011-10-02

Abstract:

The carbon/nitrogen (C/N) ratio affects processes of nitrification and denitrification in water treatment in batch reactors. It is important to clarify the effect of C/N ratio. In the present study, experiments were performed to study simultaneous nitrification and denitrification (SND) at variable C/N ratios in aerobic granular sequencing batch reactors. The influent C/N ratio were controlled at 20, 15 and 10 by holding influent total nitrogen concentration at 55 mg·L^-1 and adjusting influent COD concentration. The nitrogen conversion profile and granules characteristics were investigated. The nitrification rate, denitrification rate, oxygen penetration depth and SND efficiency were used to analyze the SND performance and mechanism in aerobic granules. The results showed that the nitrification rate increased and the denitrification rate declined with decreases in C/N ratio. The higher the C/N ratio, the larger the granules that could be achieved. Denitrification rate determined by oxygen penetration depth in granules decreased with the reduction of C/N ratio. On account of nitrogen removal and SND efficiency, C/N ratio of 20 is the optimum. Good SND efficiency and nitrogen removal could be obtained through the reduction of the oxygen penetration depth by limiting the aeration after ammonia oxidation or decreasing cycle time.

Keywords:

Simultaneous nitrification and denitrification, aerobic granule, sequencing batch reactor, C/N ratio

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 3&4
Category: Environment
Pages: 1131-1136

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