Journal of Food, Agriculture and Environment

Effect of carbon source on biological nitrogen removal of aerobic granules in 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: 2012-01-05, Accepted Date: 2012-04-27

Abstract:

A carbon source as the electron donor for denitrification affects the efficiency of nitrogen removal by sludge granules in the wastewater treatment systems of granular sequencing batch reactors. However, there are very limited reports on the nitrogen removal process in aerobic granular SBR at different carbon sources although research attention has been recently given to the carbon source on the characteristics of aerobic granules. Therefore, in this study, nitrogen removal processes of aerobic granules under different carbon sources were studied. Two parallel granular sequencing batch reactors (R1 and R2) were fed with glucose and a mixture of glucose with acetate, respectively. After both reactors reached the steady state, bigger and looser granules were formed in R1 compared with granules achieved in R2. Nitrification and denitrfication processes and microbial diversity of granules were investigated in both reactors. The simultaneous nitrification and denitrification (SND) and total nitrogen removal efficiencies in R1 were lower than those of R2. Utilization of a mixture of glucose with acetate is more conducive to nitrogen removal processes. The main cause of the difference between nitrogen removal of aerobic granules was the carbon source for denitrfication and granules with proper structure and size.  The results in this study would be useful for the optimal operation of biological wastewater treatment with aerobic granules. 

Keywords:

Aerobic granules, carbon source, nitrogen removal, simultaneous nitrification and denitrification

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 1110-1113

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