Minimization of nitrous oxide emission from anoxic-oxic biological nitrogen removal process : Effect of influent COD/NH_4^+ ratio and feeding strategy(ENVIRONMENTAL BIOTECHNOLOGY)

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概要

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• Nitrous oxide (N_2O) is an important greenhouse gas and biological nitrogen removal process of wastewater treatment plant is one of its sources. Mechanisms of N_2O emissions from anoxic-oxic biological nitrogen removal process were investigated and minimizations of N_2O emissions were carried out from the aspect of organic carbon supplement, i.e., influent COD/NH_4^+ ratio (C/N ratio) and feeding strategy. Results showed that during anoxic-oxic biological nitrogen removal process, most of the N_2O emissions occurred during the oxic phase, and both nitrifier denitrification and aerobic hydroxylamine oxidation pathways were possible mechanisms responsible for N_2O emissions. N_2O conversion rate decreased from 6.0% to 1.3% when the influent C/N ratio was increased from 7.5 to 14.5. This was mainly because of decrease in the abundance of Nitrosomonas-like ammonia oxidizing bacteria. Step feeding and external carbon source addition could reduce N_2O conversion rate by 66.6% and 12.0%, respectively. Both of them were feasible methods for minimizing N_2O emission from wastewater treatment process. The low N_2O emission of step feeding was because of its high dissolved oxygen (DO) and low ammonium concentrations during the oxic phase, while the minimization effect of external carbon source addition was ascribed to its high nitrogen removal efficiency.

• 公益社団法人日本生物工学会の論文
• 2013-03-00

著者

• Xie Huijun

  Environmental Research Institute, Shandong University

• Xie Huijun

  Environmental Research Institute Shandong University

• Hu Zhen

  Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University:Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa

• Zhang Jian

  Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University

• Liang Shuang

  Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University

• Li Shanping

  Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University

関連論文

• Effect of aeration rate on the emission of N_2O in anoxic-aerobic sequencing batch reactors (A/O SBRs)(ENVIRONMENTAL BIOTECHNOLOGY)
• Minimization of nitrous oxide emission from anoxic-oxic biological nitrogen removal process : Effect of influent COD/NH_4^+ ratio and feeding strategy(ENVIRONMENTAL BIOTECHNOLOGY)

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