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Phosphorus Migration and Transformation in Activated Sludge by Ultrasonic Treatment

Author

Listed:
  • Huaixing Yu

    (Department of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
    Guangdong Guangye Environmental Protection Industry Group Co., Ltd., Guangzhou 510180, China)

  • Yuhao Yang

    (Department of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China)

  • Xueya Wu

    (Department of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China)

  • Weifang Yuan

    (Guangdong Guangye Environmental Protection Industry Group Co., Ltd., Guangzhou 510180, China)

  • Hao Wang

    (Guangdong Guangye Environmental Protection Industry Group Co., Ltd., Guangzhou 510180, China)

  • Huanzhong Deng

    (Department of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China)

  • Lianpeng Sun

    (Department of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China)

  • Ruohong Li

    (Department of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China)

Abstract

Ultrasonic treatment is an effective method to disintegrate sludge and extract organic matter and nutrients, including nitrogen and phosphorus, from the sludge. This study investigated the transformation of phosphorus species during the ultrasonic treatment of sludge, to reveal the mechanism of phosphorus migration in the activated sludge structure. The experimental results indicated that power density and ultrasonic time were critical parameters affecting the energy input for sludge integration. The optimal phosphorus release performance was achieved at 2.5 W/mL 10 min. The release of phosphorus showed as a layer-by-layer pattern from the inner sludge core to the outer sphere of the multiple-layer structure of the sludge. The complex sludge structure played an important role in buffering the ultrasonication process and transfer of phosphorus. Mg-P, Ca-P, and organic phosphorus are the main phosphorus species that can be extracted from the sludge core into the supernatant. The three-stage process of phosphorus migration through the sludge layers, including dissolution, reprecipitation, and equilibrium, has been revealed.

Suggested Citation

  • Huaixing Yu & Yuhao Yang & Xueya Wu & Weifang Yuan & Hao Wang & Huanzhong Deng & Lianpeng Sun & Ruohong Li, 2022. "Phosphorus Migration and Transformation in Activated Sludge by Ultrasonic Treatment," Sustainability, MDPI, vol. 14(18), pages 1-13, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:18:p:11224-:d:909247
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