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Comprehensive assessment of sludge wet air oxidation and its combination with anaerobic digestion

Author

Listed:
  • Liu, Jiayi
  • Li, Debin
  • Wang, Lin
  • Li, Huan
  • Deng, Zhou

Abstract

Wet air oxidation (WAO) is a promising sludge treatment technology but has yet to be used widely. This study evaluates a new integrated pathway of AD plus WAO, juxtaposing against the standalone AD and WAO, from the aspects of carbon emissions, energy efficiency, and cost-benefits. The assessment unit is 1 t dewatered sludge with a water content of 80 %, and the greenhouse gases are converted to equivalent CO2. WAO can recover the thermal heat released from organic oxidation, resulting in the lowest carbon emissions, 10.92 to −36.86 kg CO2-eq/t. AD plus WAO also performs well with 32.21 to −48.16 kg CO2-eq/t. All three ways can produce renewable energy through biogas utilization or thermal recovery. WAO has the highest energy efficiency of 35%–42 % due to efficient thermal energy recovery, and AD plus WAO has a second-ranked efficiency of 15%–30 %. However, WAO needs expensive facilities and external electricity, resulting in a higher expenditure than AD. The integrated systems also require a high investment, but can simplify digested sludge treatment. According to the normalized scores in the three aspects, WAO is recommended chiefly, especially for treating low-organic-content sludge. AD plus WAO ranked second and can be used for high-organic-content sludge.

Suggested Citation

  • Liu, Jiayi & Li, Debin & Wang, Lin & Li, Huan & Deng, Zhou, 2024. "Comprehensive assessment of sludge wet air oxidation and its combination with anaerobic digestion," Renewable Energy, Elsevier, vol. 237(PB).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pb:s0960148124018536
    DOI: 10.1016/j.renene.2024.121785
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