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Reasons for Ineffectiveness in Improving Dewaterability of Anaerobically Digested Sludge by Bioleaching

Author

Listed:
  • Haochi Zhang

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
    These authors contributed equally to this work.)

  • Dejin Zhang

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
    These authors contributed equally to this work.)

  • Yujun Zhou

    (Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Di Fang

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)

  • Chunhong Cui

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)

  • Jianru Liang

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)

  • Bo Zhou

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)

  • Mingjiang Zhang

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)

  • Jiansheng Li

    (Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Lixiang Zhou

    (Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
    Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China)

Abstract

The use of bioleaching for anaerobically digested sludge (ADS) was found to be ineffective compared to using it for undigested sludge (UDS) for reasons elucidated in this study. Results showed that specific resistance to filtration of ADS increased during bioleaching. The pH value of ADS increased to 7.97 and remained unchanged during bioleaching, while it decreased to 2.98 for UDS. Added Fe 2+ was not detected as the energy source for ADS. Higher alkalinity and unavailable Fe 2+ in ADS prevented the growth of the Acidithiobacillus species. It was found that sludge pH increased to 8.40 and then stayed within an alkaline range, whereas slime EPS content rapidly increased to 8.13 mg DOC/g VSS. These results indicated that aeration seriously deteriorated the dewaterability of ADS through bioleaching due to the unexpected drastic increase of sludge pH and slime EPS content.

Suggested Citation

  • Haochi Zhang & Dejin Zhang & Yujun Zhou & Di Fang & Chunhong Cui & Jianru Liang & Bo Zhou & Mingjiang Zhang & Jiansheng Li & Lixiang Zhou, 2023. "Reasons for Ineffectiveness in Improving Dewaterability of Anaerobically Digested Sludge by Bioleaching," Sustainability, MDPI, vol. 15(6), pages 1-11, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:4789-:d:1091063
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