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Effect of the Influent Substrate Concentration on Nitrogen Removal from Summer to Winter in Field Pilot-Scale Multistage Constructed Wetland–Pond Systems for Treating Low-C/N River Water

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  • Tao Wang

    (School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
    State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD), Chinese Research Academy of Environmental Sciences, Beijing 100012, China
    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
    College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, China)

  • Liping Xiao

    (School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
    These authors contributed equally to this work.)

  • Hongbin Lu

    (State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD), Chinese Research Academy of Environmental Sciences, Beijing 100012, China
    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
    College of Water Sciences, Beijing Normal University, Beijing 100875, China)

  • Shaoyong Lu

    (State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD), Chinese Research Academy of Environmental Sciences, Beijing 100012, China
    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China)

  • Xiaoliang Zhao

    (College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, China)

  • Fuchun Liu

    (College of Life Science, Cangzhou Normal University, Cangzhou 061001, China)

Abstract

The quality of micropolluted water is unstable and its substrate concentration fluctuates greatly. The goal is to predict the concentration effect on the treatment of nitrogen in a river with an actual low C/N ratio for the proposed full-scale Xiaoyi River estuary wetland, so that the wetland project can operate stably and perform the water purification function effectively in the long term. Two pilot-scale multistage constructed wetland–pond (MCWP) systems (S1 and S2, respectively) based on actual engineering with the same “front ecological oxidation ponds, two-stage horizontal subsurface flow constructed wetlands and surface flow constructed wetlands (SFCWs) as the core and postsubmerged plant ponds” as the planned process were constructed to investigate the effect of different influent permanganate indexes (COD Mn ) and total nitrogen (TN) contents on nitrogen removal from micropolluted river water with a fixed C/N ratio from summer to winter in the field. The results indicate that the TN removal rate in the S1 and S2 systems was significant (19.56% and 34.84%, respectively). During the process of treating this micropolluted water with a fixed C/N ratio, the influent of S2 with a higher COD Mn concentration was conducive to the removal of TN. The TN removal rate in S2 was significantly affected by the daily highest temperature. There was significant nitrogen removal efficiency in the SFCWs. The C/N ratio was a major determinant influencing the nitrogen removal rate in the SFCWs. The organic matter release phenomenon in SFCWs with high-density planting played an essential role in alleviating the lack of carbon sources in the influent. This research strongly supports the rule that there is seasonal nitrogen removal in the MCWPs under different influent substrate concentrations, which is of guiding significance for practical engineering.

Suggested Citation

  • Tao Wang & Liping Xiao & Hongbin Lu & Shaoyong Lu & Xiaoliang Zhao & Fuchun Liu, 2021. "Effect of the Influent Substrate Concentration on Nitrogen Removal from Summer to Winter in Field Pilot-Scale Multistage Constructed Wetland–Pond Systems for Treating Low-C/N River Water," Sustainability, MDPI, vol. 13(22), pages 1-20, November.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:22:p:12456-:d:676901
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    References listed on IDEAS

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    1. K. Dimitri Kits & Christopher J. Sedlacek & Elena V. Lebedeva & Ping Han & Alexandr Bulaev & Petra Pjevac & Anne Daebeler & Stefano Romano & Mads Albertsen & Lisa Y. Stein & Holger Daims & Michael Wag, 2017. "Kinetic analysis of a complete nitrifier reveals an oligotrophic lifestyle," Nature, Nature, vol. 549(7671), pages 269-272, September.
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