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From pre-treatment to co-treatment - How successful is ultrasonication of digested sewage sludge in continuously operated anaerobic digesters?

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  • Lippert, Thomas
  • Bandelin, Jochen
  • Xu, Yunqi
  • Liu, Yu Chen
  • Robles, Gabriel Hernández
  • Drewes, Jörg E.
  • Koch, Konrad

Abstract

The present study assessed the performance of ultrasonic co-treatment, i.e., the treatment of digested sewage sludge in continuously operated anaerobic digesters. Experiments were carried out using a non-sonicated control digester and a sonicated test digester. The test digester received side-stream sonication (∼10% of reactor volume per day) at a specific energy input of 2,000 kJ/kgTS. Treatment effects were monitored based on (i) specific methane production, (ii) (volatile) solids removal, and (iii) digestate dewaterability. Results revealed that co-treatment significantly enhanced average methane production (+6%), volatile solids removal (+9%), and solids reduction in the digestate (−5%). However, due to the only moderate enhancement and the relatively high energy input, the average cost recovery (i.e., the ratio between electricity costs and benefits due to additional methane and improved solids removal) was only 6%–9%, depending on the assumed disposal costs. Moreover, as sonication led to impaired digestate dewaterability (average increase in normalized capillary suction time of 14%), the cost recovery due to reduced residual sludge might be negated again by lower dewatering efficiency. Overall, co-treatment seemed not economical under the conditions investigated. To render co-treatments economically feasible, further research, especially exploring the potential of low energy input sonication, is required.

Suggested Citation

  • Lippert, Thomas & Bandelin, Jochen & Xu, Yunqi & Liu, Yu Chen & Robles, Gabriel Hernández & Drewes, Jörg E. & Koch, Konrad, 2020. "From pre-treatment to co-treatment - How successful is ultrasonication of digested sewage sludge in continuously operated anaerobic digesters?," Renewable Energy, Elsevier, vol. 166(C), pages 56-65.
    • Handle: RePEc:eee:renene:v:166:y:2020:i:c:p:56-65
    DOI: 10.1016/j.renene.2020.11.128
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    References listed on IDEAS

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    1. Panigrahi, Sagarika & Dubey, Brajesh K., 2019. "A critical review on operating parameters and strategies to improve the biogas yield from anaerobic digestion of organic fraction of municipal solid waste," Renewable Energy, Elsevier, vol. 143(C), pages 779-797.
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    2. Steindl, Matthias & Dandikas, Vasilis & Lichti, Fabian & Höcherl, Susanne & Koch, Konrad, 2023. "A comprehensive study on the consequences of substituting energy crops by alternative substrates for biogas production in Germany," Renewable Energy, Elsevier, vol. 219(P2).

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