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Enhanced Nutrients Removal Using Reeds Straw as Carbon Source in a Laboratory Scale Constructed Wetland

Author

Listed:
  • Tong Wang

    (School of Civil Engineering, Chang’an University, Xi’an 710061, China)

  • Haiyan Wang

    (State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, No. 8 Da Yang Fang, Anwai, Chaoyang District, Beijing 100012, China
    Research Center for Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, No. 8 Da Yang Fang, Anwai, Chaoyang District, Beijing 100012, China)

  • Yang Chang

    (School of Civil Engineering, Chang’an University, Xi’an 710061, China
    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, No. 8 Da Yang Fang, Anwai, Chaoyang District, Beijing 100012, China
    Research Center for Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, No. 8 Da Yang Fang, Anwai, Chaoyang District, Beijing 100012, China)

  • Zhaosheng Chu

    (State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, No. 8 Da Yang Fang, Anwai, Chaoyang District, Beijing 100012, China
    National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China)

  • Yaqian Zhao

    (State Key Laboratory of Eco-Hydraulic Engineering in Arid Area, Xi’an University of Technology, Xi’an 710048, China
    UCD Dooge Centre for Water Resources Research, School of Civil Engineering, Newstead Building, University College Dublin, Belfield, Dublin 4, Ireland)

  • Ranbin Liu

    (UCD Dooge Centre for Water Resources Research, School of Civil Engineering, Newstead Building, University College Dublin, Belfield, Dublin 4, Ireland)

Abstract

The low carbon/nitrogen (C/N) ratio and high nitrate content characteristics of agricultural runoff restricted the nitrogen removal in constructed wetlands (CWs). To resolve such problems, the economically- and easily-obtained Phragmites Australis (reeds) litters were applied and packed in the surface layer of a surface flow CW as external carbon sources. The results demonstrated that the introduction of the reeds straw increased the C concentration as a result of their decomposition during the CW operation, which will help the denitrification in the ensuing operation of an entire 148 days. The total nitrogen (TN) and Chemical Oxygen Demand (COD) () in the effluent reached the peak level of 63.2 mg/L and 83 mg/L at the fourth and the second day, respectively. Subsequently, the pollutants in the CW that were filled with straw decreased rapidly and achieved a stable removal after 13 days of operation. Moreover, the present study showed that the N removal efficiency increased with the increase of the hydraulic retention time (HRT). Under the HRT of four days, the CW presented 74.1 ± 6%, 87.4 ± 6% and 56.0 ± 6% removal for TN, NO 3 - , and TP, respectively.

Suggested Citation

  • Tong Wang & Haiyan Wang & Yang Chang & Zhaosheng Chu & Yaqian Zhao & Ranbin Liu, 2018. "Enhanced Nutrients Removal Using Reeds Straw as Carbon Source in a Laboratory Scale Constructed Wetland," IJERPH, MDPI, vol. 15(6), pages 1-10, May.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:6:p:1081-:d:149177
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    References listed on IDEAS

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    1. Huang, Ning-bo & Su, Bao-lin & Li, Rui-rui & Yang, Wu-zhi & Shen, Meng-meng, 2014. "A field-scale observation method for non-point source pollution of paddy fields," Agricultural Water Management, Elsevier, vol. 146(C), pages 305-313.
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    Cited by:

    1. Yu Ling & Guokai Yan & Haiyan Wang & Weiyang Dong & Huan Wang & Yang Chang & Ming Chang & Congyu Li, 2021. "Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal," IJERPH, MDPI, vol. 18(3), pages 1-13, January.
    2. Yanjie Zhang & Weiyang Dong & Guokai Yan & Haiyan Wang & Huan Wang & Yang Chang & Shan Yu & Zhaosheng Chu & Yu Ling & Congyu Li, 2022. "Plant Carbon Sources for Denitrification Enhancement and Its Mechanism in Constructed Wetlands: A Review," Sustainability, MDPI, vol. 14(19), pages 1-23, October.

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