Pedosphere 16(4): 451--456, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Nitrous oxide production in a sequence batch reactor wastewater treatment system using synthetic wastewater |
MAO Jian 1,3, JIANG Xiao-Qin3, YANG Lin-Zhang2, ZHANG Jian3, QIAO Qing-Yun3, HE Chen-Da3 and YIN Shi-Xue1,3 |
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). E-mail: maojian@mail.issas.ac.cn
2 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
3 College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009 (China) |
| ABSTRACT |
| The rate of nitrous oxide emission from a laboratory sequence batch reactor (SBR) wastewater treatment system using synthetic wastewater was measured under controlled conditions. The SBR was operated in the mode of 4 h for aeration, 3.5 h for stirring without aeration, 0.5 h for settling and drainage, and 4 h of idle. The sludge was acclimated by running the system to achieve a stable running state as indicated by rhythmic changes of total N, dissolved oxygen, chemical oxygen demand, NO2-, NO3-, NH4+, pH, and N2O. Under the present experimental conditions measured nitrous oxide emitted from the off-gas in the aerobic and anaerobic phases, respectively, accounted for 8.6%-16.1% and 0-0.05% of N removed, indicating that the aerobic phase was the main source of N2O emission from the system. N2O dissolved in discharged water was considerable in term of concentration. Thus, measures to be developed for the purpose of reducing N2O emission from the system should be effective in the aeration phase. |
| Key Words: denitrification, nitrification, nitrous oxide, sequence batch reactor, wastewater treatment system |
| Citation: Mao, J., Jiang, X. Q., Yang, L. Z., Zhang, J., Qiao, Q. Y., He, C. D. and Yin, S. X. 2006. Nitrous oxide production in a sequence batch reactor wastewater treatment system using synthetic wastewater. Pedosphere. 16(4): 451-456. |
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