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<p>In the future, there will be a growing interest in wastewater treatment plants (WWTP) to&#xa0;generate electricity from biogas in a more flexible manner to reduce electricity costs, for example. This study investigated the feasibility of discontinuous feeding in anaerobic digestion to enhance the flexibility of biogas production throughout the day. The main focus was on typical WWTP substrates such as waste activated sludge (WAS), thermally hydrolyzed WAS, primary sludge (PS), and mixed sludge (mixture of WAS and PS). Results of continuous digestion experiments indicate that stable digestion conditions can be maintained even with a single daily feeding. The pilot study comparing discontinuous feeding and continuous feeding of WAS showed no significant impact on specific biogas yield or process stability. Laboratory-scale experiments extended this analysis to different sludge types and again found no negative effects on process stability. Discontinuous feeding once per day successfully shifted a significant portion of daily biogas production to the first 12&#xa0;h after feeding. Depending on the substrate, between 37 and 52% of the daily biogas quantity could be produced within 6 h after feeding.</p> Graphical Abstract <p></p>

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Flexible Biogas Production from Anaerobic Digestion of Sewage Sludge by Discontinuous Feeding

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月18日

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  • J. Rühl,
  • M. Engelhart

摘要

In the future, there will be a growing interest in wastewater treatment plants (WWTP) to generate electricity from biogas in a more flexible manner to reduce electricity costs, for example. This study investigated the feasibility of discontinuous feeding in anaerobic digestion to enhance the flexibility of biogas production throughout the day. The main focus was on typical WWTP substrates such as waste activated sludge (WAS), thermally hydrolyzed WAS, primary sludge (PS), and mixed sludge (mixture of WAS and PS). Results of continuous digestion experiments indicate that stable digestion conditions can be maintained even with a single daily feeding. The pilot study comparing discontinuous feeding and continuous feeding of WAS showed no significant impact on specific biogas yield or process stability. Laboratory-scale experiments extended this analysis to different sludge types and again found no negative effects on process stability. Discontinuous feeding once per day successfully shifted a significant portion of daily biogas production to the first 12 h after feeding. Depending on the substrate, between 37 and 52% of the daily biogas quantity could be produced within 6 h after feeding.

Graphical Abstract