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Characterization, Spatial Variation and Management Strategy of Sewer Sediments Collected from Combined Sewer System: A Case Study in Longgang District, Shenzhen

Author

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  • Yongpeng Luo

    (School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China)

  • Shenxu Bao

    (School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China)

  • Siyuan Yang

    (School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China)

  • Yimin Zhang

    (School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
    State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Yang Ping

    (Shenzhen Water Planning and Design Institute Co., Ltd., Shenzhen 518116, China)

  • Chao Lin

    (Shenzhen Water Planning and Design Institute Co., Ltd., Shenzhen 518116, China)

  • Pan Yang

    (Department of Civil and Environmental Engineering, University of Illinois at Urbana Champaign, 205 N Mathews Ave, Urbana, IL 61820, USA)

Abstract

In the urban drainage system, the formation of sewer sediments is inevitable, and the removal of sewer sediments is necessary for system maintenance. Disposal of arisings from sewer sediment removal is becoming a serious environmental issue. The current knowledge of sewer sediments is limited, which is restrained to sewer sediments management. To better understand this municipal waste, the sewer sediments of a combined sewer system in Longgang District, Shenzhen were collected and characterized, and the spatial distribution characteristics of contaminants were analyzed. Based on the bivariate correlation analysis, it is found that many contaminants in sewer sediments have a strong relationship with spatial variables. Compared to the sewer sediments in industrial areas, those in residential areas contain higher concentrations of Hg and phosphorus. The sediments in the sewage conduit also contain more organic matter (OM), phosphorus, Cu, and Ni, and the sediments in the rainwater conduit contain a higher concentration of Cd. Moreover, the sediments produced in different catchments also show huge differences in the content of contaminants. These spatial distribution characteristics may provide help for the further classification of sewer sediments, thereby making the disposal of sediments more targeted. According to the local standards of sludge disposal, land application and incineration are not suitable for managing sewer sediments due to the low OM content and poor lower heating value (LHV). Although sanitary landfill is feasible for sewer sediments disposal, the complicated composition of sewer sediments still poses the risk of polluting the surrounding environment. The management of sewer sediments via the production of building materials is a promising technical route that can avoid the migration of hazardous contaminants and produce valuable products. This study may improve our understanding of sewer sediments and provide a reliable recommendation for sewer sediment management.

Suggested Citation

  • Yongpeng Luo & Shenxu Bao & Siyuan Yang & Yimin Zhang & Yang Ping & Chao Lin & Pan Yang, 2021. "Characterization, Spatial Variation and Management Strategy of Sewer Sediments Collected from Combined Sewer System: A Case Study in Longgang District, Shenzhen," IJERPH, MDPI, vol. 18(14), pages 1-17, July.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:14:p:7687-:d:597530
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    References listed on IDEAS

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