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Enhanced Dewatering of Activated Sludge by Skeleton-Assisted Flocculation Process

Author

Listed:
  • Jiahua Xia

    (Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China)

  • Ting Rao

    (Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China)

  • Juan Ji

    (Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China)

  • Bijuan He

    (Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China)

  • Ankang Liu

    (Nanjing Water Purification Environmental Research Institute Co., Ltd., Nanjing 211100, China)

  • Yongjun Sun

    (College of Urban Construction, Nanjing Tech University, Nanjing 211800, China)

Abstract

Sludge dewatering is the fundamental process of sludge treatment. Environmentally friendly and efficient sludge conditioning methods are the premises of sludge to achieve dehydration reduction and resource utilization. In response to sewage plant sludge dehydration, fly ash (FA), polymerized aluminum chloride (PAC), and polymer sulfate (PFS) were studied separately to determine their sludge dehydration performance, and the effects of these three conditioner composite regulations on sludge dehydration properties were studied. Compared to the sludge treated only with conditioner, the average particle size of floc increased and the organic matter content in the filtrate decreased. The sludge dewatering efficiency after the conditioning effect is better than that after conditioning a single conditioner. After PFS conditioning with fly ash, the water content and specific resistance (SRF) of the sludge cake can be reduced to 76.39% and 6.63 × 10 10 m/kg, respectively. The moisture content and specific resistance (SRF) of the sludge cake can be reduced to 76.10% and 6.91 × 10 10 m/kg, respectively. The pH of the sludge and filtrate changed slightly after PAC conditioning with fly ash coupling. These results indicate that fly-ash coupled with PAC and fly-ash coupled with PFS are expected to become a novel and effective environmental protection combined conditioning method for sludge dewatering.

Suggested Citation

  • Jiahua Xia & Ting Rao & Juan Ji & Bijuan He & Ankang Liu & Yongjun Sun, 2022. "Enhanced Dewatering of Activated Sludge by Skeleton-Assisted Flocculation Process," IJERPH, MDPI, vol. 19(11), pages 1-17, May.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:11:p:6540-:d:825714
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    Citations

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    Cited by:

    1. Tomasz Kamizela & Małgorzata Worwąg & Mariusz Kowalczyk, 2023. "Environmentally Safe Method for Conditioning and Dewatering Sewage Sludge Using Iron Coagulant, Cellulose and Perlite," Energies, MDPI, vol. 17(1), pages 1-21, December.
    2. Jiahua Xia & Juan Ji & Zhiqiang Hu & Ting Rao & Ankang Liu & Jingqian Ma & Yongjun Sun, 2022. "Application of Advanced Oxidation Technology in Sludge Conditioning and Dewatering: A Critical Review," IJERPH, MDPI, vol. 19(15), pages 1-14, July.

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