Pedosphere 18(3): 401--408, 2008
ISSN 1002-0160/CN 32-1315/P
©2008 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| A new soil infiltration technology for decentralized sewage treatment: Two-stage anaerobic tank and soil trench system |
YE Chun1,2 , HU Zhan-Bo1,2, KONG Hai-Nan1, WANG Xin-Ze1 and HE Sheng-Bing1 |
1 School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240 (China). E-mail: yechbj@163.com
2 School of Light Industry and Food Engineering, Guangxi University, Nanning 530004 (China)
3 Research Center of Lake Ecological Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012 (China) |
| ABSTRACT |
| The low removal effciency of total nitrogen (TN) is one of the main disadvantages of traditional single stage subsurface infiltration system, which combines an anaerobic tank and a soil filter field. In this study, a full-scale, two-stage anaerobic tank and soil trench system was designed and operated to evaluate the feasibility and performances in treating sewage from a school campus for over a one-year monitoring period. The raw sewage was prepared and fed into the first anaerobic tank and second tank by 60% and 40%, respectively. This novel process could decrease chemical oxygen demand with the dichromate method by 89%-96%, suspended solids by 91%-97%, and total phosphorus by 91%-97%. The denitrification was satisfactory in the second stage soil trench, so the removals of TN as well as ammonia nitrogen (NH4+-N) reached 68%-75% and 96%-99%, respectively. It appeared that the removal effciency of TN in this two-stage anaerobic tank and soil trench system was more effective than that in the single stage soil infiltration system. The effuent met the discharge standard for the sewage treatment plant (GB18918-2002) of China. |
| Key Words: decentralized treatment, nitrogen removal, soil trench system, subsurface infiltration |
| Citation: Ye, C., Hu, Z. B., Kong, H. N., Wang, X. Z. and He, S. B. 2008. A new soil infiltration technology for decentralized sewage treatment: Two-stage anaerobic tank and soil trench system. Pedosphere. 18(3): 401-408. |
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