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Treatment of Sewage Using a Constructed Soil Rapid Infiltration System Combined with Pre-Denitrification

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  • Wenlai Xu

    (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
    Haitian Water Group Stock Company, Chengdu 610059, China
    Department of Chemical and Engineering, Tokyo University of Agriculture & Technology, Tokyo 1848588, Japan)

  • Jinyao Chen

    (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China)

  • Yue Jian

    (Environmental Research Institute, ChongQing Academy of Animal Sciences, Chongqing 404100, China)

  • Zhicheng Pan

    (Haitian Water Group Stock Company, Chengdu 610059, China)

  • Zishen Mou

    (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China)

Abstract

The activated sludge process of the anaerobic/oxic (A/O) process has a good denitrification performance because it can make full use of the carbon source in the original sewage, and the denitrification can provide alkalinity for aerobic nitrification. The traditional constructed soil rapid infiltration (CSRI) system, on the other hand, has a poor nitrogen removal effect. Dividing the traditional CSRI system into two sections, one performs denitrification as an anoxic section, while the other performs nitrification as an aerobic section and is placed after the anoxic section. The nitrification liquid of the effluent from the aerobic section is mixed with the original wastewater and enters the anoxic section for denitrification. We expected that this would be improved by combining CSRI with a pre-denitrification step that would make full use of the carbon source in the original sewage. In a small-scale experimental model, the removal efficiencies of nitrogen, in the form of ammonium, nitrate, and total nitrogen (TN), as well as chemical oxygen demand (COD), were determined. The hydraulic load was varied, while the backflow reflux capacity was kept constant, to determine the effect on the pre-denitrification process. An average removal rate of 95.4% for NH 4 + -N and 96% for COD could be obtained when a hydraulic load of 80 cm 3 (cm 2 ·d) −1 and a reflux ratio of 75% were applied. Under these conditions, the average removal rate of TN was 77.4%, which is much higher than what can be typically achieved with conventional CSRI systems.

Suggested Citation

  • Wenlai Xu & Jinyao Chen & Yue Jian & Zhicheng Pan & Zishen Mou, 2018. "Treatment of Sewage Using a Constructed Soil Rapid Infiltration System Combined with Pre-Denitrification," IJERPH, MDPI, vol. 15(9), pages 1-13, September.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:9:p:2005-:d:169775
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    References listed on IDEAS

    as
    1. Qinglin Fang & Wenlai Xu & Zhijiao Yan & Lei Qian, 2018. "Effect of Potassium Chlorate on the Treatment of Domestic Sewage by Achieving Shortcut Nitrification in a Constructed Rapid Infiltration System," IJERPH, MDPI, vol. 15(4), pages 1-11, April.
    2. Qinglin Fang & Wenlai Xu & Gonghan Xia & Zhicheng Pan, 2018. "Effect of C/N Ratio on the Removal of Nitrogen and Microbial Characteristics in the Water Saturated Denitrifying Section of a Two-Stage Constructed Rapid Infiltration System," IJERPH, MDPI, vol. 15(7), pages 1-13, July.
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