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Post-treatment options for anaerobically digested sludge: Current status and future prospect.

Zhiyao Wang1, Tao Liu1, Haoran Duan1

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Post-treatment of anaerobically digested (AD) sludge enhances dewaterability and reduces costs. Future strategies should integrate volume reduction, stabilization, and metal removal for sustainable sludge management.

Keywords:
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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Biotechnology

Background:

  • Anaerobic digestion (AD) in wastewater treatment plants (WWTPs) produces biogas and AD sludge.
  • AD sludge land application faces economic and regulatory challenges due to water, organic, odor, pathogen, and contaminant content.

Purpose of the Study:

  • Critically evaluate state-of-the-art AD sludge post-treatment technologies.
  • Propose future directions for integrated AD sludge management.

Main Methods:

  • Categorization of technologies by primary aims: dewaterability, solids reduction/stabilization, and toxic metals removal.
  • Review of current and proposed post-treatment approaches.

Main Results:

  • Current post-treatment primarily focuses on dewaterability enhancement to cut transport expenses.
  • Future approaches should target integrated sludge volume reduction, stabilization (including pathogen removal), and metal solubilization.

Conclusions:

  • Post-treatment can lead to more economical, acceptable, and sustainable AD sludge management.
  • Further development and evaluation are necessary for widespread adoption of advanced treatment methods.