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<p>In this study, the strategy for improving energy balance of wastewater treatment plants using pre-treated coffee waste represented by coffee spent grains (SCG) as a co-substrate to sewage sludge (SS) was proposed. Hydrodynamic cavitation at a pressure of 5&#xa0;bar with a duration of 20 and 30&#xa0;min was chosen as a pre-treatment method. The anaerobic digestion was conducted in a batch system under mesophilic conditions; the substrate-to-inoculum ratio was 0.69–0.71. Two co-digestion series with cavitated SCG were provided, differing in terms of caffeine content. Moreover, the co-digestion series supplied with raw SCG and mono-digestion of SS were conducted as reference experiments. The obtained results indicated that, compared to SS mono-digestion, a significant yielding growth by 12% was found in the series supplied by a mixture of SS and SCG with the highest content of caffeine cavitated for 30&#xa0;min. Therein, the methane yield was 462.3 ± 21.3 mLCH<sub>4</sub>/gVS accompanied by improved methane production rate by 9% and shortening of the lag phase. The evaluation of energy balance with the significant energy profits of 39% was found. Moreover, the results of the economic analysis indicate that only in this case the cost-effectiveness of the technology was achieved.</p>

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Improving energy balance of wastewater treatment plants using pre-treated coffee waste as a co-substrate in anaerobic digestion process

  • 期刊论文

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  • 发表日期：

    2026年1月7日

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  • Aleksandra Szaja,
  • Agnieszka Montusiewicz,
  • Rafał Panek,
  • Iwona Musielewicz,
  • Magdalena Lebiocka

摘要

In this study, the strategy for improving energy balance of wastewater treatment plants using pre-treated coffee waste represented by coffee spent grains (SCG) as a co-substrate to sewage sludge (SS) was proposed. Hydrodynamic cavitation at a pressure of 5 bar with a duration of 20 and 30 min was chosen as a pre-treatment method. The anaerobic digestion was conducted in a batch system under mesophilic conditions; the substrate-to-inoculum ratio was 0.69–0.71. Two co-digestion series with cavitated SCG were provided, differing in terms of caffeine content. Moreover, the co-digestion series supplied with raw SCG and mono-digestion of SS were conducted as reference experiments. The obtained results indicated that, compared to SS mono-digestion, a significant yielding growth by 12% was found in the series supplied by a mixture of SS and SCG with the highest content of caffeine cavitated for 30 min. Therein, the methane yield was 462.3 ± 21.3 mLCH4/gVS accompanied by improved methane production rate by 9% and shortening of the lag phase. The evaluation of energy balance with the significant energy profits of 39% was found. Moreover, the results of the economic analysis indicate that only in this case the cost-effectiveness of the technology was achieved.