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<p>Anaerobic digestion (AD) of organic wastes is a promising approach for bioenergy recovery. The freshwater, which is typically used to prepare the feeding slurry for the AD reactor, could be replaced by greywater, which could help address the water crisis. However, varied physico-chemical characteristics of wastewater streams can affect the performance of the AD reactors which is generally influenced by the spatial and temporal variation. Hence, there is a need to assess the viability of utilizing locally produced wastewater for direct use in AD reactors. Therefore, this study investigated the performance of two floating drum-type pilot-scale anaerobic digesters (192 L working volume) treating kitchen wastes: digester A (fed with greywater) and digester B (fed with freshwater). Each digester was operated for 55&#xa0;days at a solid concentration of 5% TS/d, a hydraulic retention time of 30&#xa0;days, and a mesophilic temperature range (30–32&#xa0;°C). During the operation, digester A achieved an average methane yield of 158.48 ± 58.16 L/kg VS<sub>input</sub>, 12% higher than digester B. A volatile mass conversion efficiency of 35% in digester A and 33% in digester B was achieved during the experimental period, attaining an energy balance of 96–97%, with net energy outputs of 105&#xa0;MJ in digester A and 92&#xa0;MJ in digester B. Thus, the study recommends the use of greywater streams replacing the freshwater supporting sustainable water practices in AD-based biorefineries. Furthermore, future research could be directed towards exploring the trace element interactions in wastewater-fed AD, pathogen removal, and enhancing volatile solids conversion to biogas.</p>

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Combined Strategy to Treat Kitchen Waste and Greywater Streams Using Anaerobic Digestion for Bioenergy Recovery in an Institutional Campus Community in India

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Adya Isha,
  • Tinku Casper D’ Silva,
  • Ram Chandra,
  • Paruchuri M. V. Subbarao,
  • Virendra Kumar Vijay

摘要

Anaerobic digestion (AD) of organic wastes is a promising approach for bioenergy recovery. The freshwater, which is typically used to prepare the feeding slurry for the AD reactor, could be replaced by greywater, which could help address the water crisis. However, varied physico-chemical characteristics of wastewater streams can affect the performance of the AD reactors which is generally influenced by the spatial and temporal variation. Hence, there is a need to assess the viability of utilizing locally produced wastewater for direct use in AD reactors. Therefore, this study investigated the performance of two floating drum-type pilot-scale anaerobic digesters (192 L working volume) treating kitchen wastes: digester A (fed with greywater) and digester B (fed with freshwater). Each digester was operated for 55 days at a solid concentration of 5% TS/d, a hydraulic retention time of 30 days, and a mesophilic temperature range (30–32 °C). During the operation, digester A achieved an average methane yield of 158.48 ± 58.16 L/kg VSinput, 12% higher than digester B. A volatile mass conversion efficiency of 35% in digester A and 33% in digester B was achieved during the experimental period, attaining an energy balance of 96–97%, with net energy outputs of 105 MJ in digester A and 92 MJ in digester B. Thus, the study recommends the use of greywater streams replacing the freshwater supporting sustainable water practices in AD-based biorefineries. Furthermore, future research could be directed towards exploring the trace element interactions in wastewater-fed AD, pathogen removal, and enhancing volatile solids conversion to biogas.