Elsevier

Pedosphere

Volume 18, Issue 3, June 2008, Pages 401-408
Pedosphere

A New Soil Inflltration Technology for Decentralized Sewage Treatment: Two-Stage Anaerobic Tank and Soil Trench System1

https://doi.org/10.1016/S1002-0160(08)60031-4Get rights and content

Abstract

The low removal eefficiency of total nitrogen (TN) is one of the main disadvantages of traditional single stage subsurface inflltration system, which combines an anaerobic tank and a soil fllter fleld. 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 flrst 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 denitriflcation 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 eefficiency of TN in this two-stage anaerobic tank and soil trench system was more efiective than that in the single stage soil inflltration system. The effluent met the discharge standard for the sewage treatment plant (GB18918-2002) of China.

References (22)

  • Z.B. Hu et al.

    Performance of advanced treatment using ecological lawn system: A case study

    Guizhou Enviromental Protection Science and Technology

    (2004)
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    Project supported by the National High Technology Research and Development Program (863 Program) of China (No. 2002AA601012-01).

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