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Enhanced Nitrogen Removal of Steel Rolling Wastewater by Constructed Wetland Combined with Sulfur Autotrophic Denitrification

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  • Tao Zheng

    (State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
    Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China)

  • Xiaohu Lin

    (State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China)

  • Jingcheng Xu

    (State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
    Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China)

  • Jie Ren

    (State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
    East China Architectural Design & Research Institute Co., Ltd., Shanghai 200011, China)

  • Danyan Sun

    (State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China)

  • Yunhui Gu

    (State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China)

  • Juwen Huang

    (State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
    Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China)

Abstract

Constructed wetlands (CWs), an ecological treatment technology, is suitable for advanced treatment, but has an unsatisfying denitrification performance for steel rolling wastewater with low C/N ratio. This study combined sulfur autotrophic denitrification (SAD) with conventional constructed horizontal subsurface flow wetlands to treat steel rolling wastewater, exploring the feasibility of applying SAD to enhance the denitrification performance of CWs. The reactor consists of two sections, one filled with manganese sand and gravel (HF C ) and another filled with ceramic, sulfur, and lime (HF SAD ). Results showed that HF C had a good performance on removing turbidity, DO, COD, and TP, while the average removal efficiency of total nitrogen (TN) in HF C was just 25.6%. On this basis, HF SAD could remove 45.6% of TN subsequently, whose denitrification rate was 4–6 times as high as that of HF C . Increasing hydraulic retention time could improve removal efficiency of contaminants in HF C and HF SAD in different degrees. The analysis of microbial community structure, observation results of fillers and monitored sulfate all provided proofs for the occurrence of SAD. CWs combined with SAD can be applied in the treatment of steel rolling wastewater with low carbon, which can provide reference for ecological wastewater treatment, water saving, and recycling in iron and steel enterprises.

Suggested Citation

  • Tao Zheng & Xiaohu Lin & Jingcheng Xu & Jie Ren & Danyan Sun & Yunhui Gu & Juwen Huang, 2021. "Enhanced Nitrogen Removal of Steel Rolling Wastewater by Constructed Wetland Combined with Sulfur Autotrophic Denitrification," Sustainability, MDPI, vol. 13(3), pages 1-13, February.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:3:p:1559-:d:491834
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    References listed on IDEAS

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    1. Park, Jong-Hwan & Kim, Seong-Heon & Delaune, Ronald D. & Cho, Ju-Sik & Heo, Jong-Soo & Ok, Yong Sik & Seo, Dong-Cheol, 2015. "Enhancement of nitrate removal in constructed wetlands utilizing a combined autotrophic and heterotrophic denitrification technology for treating hydroponic wastewater containing high nitrate and low ," Agricultural Water Management, Elsevier, vol. 162(C), pages 1-14.
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