Abstract
One-third of food produced results as food waste, with no organized and sustainable disposal, and ends up in landfills. Garden waste is yet another significant waste experiencing improper disposal or burning. The present study aims to assess the effect of different pretreatment processes in biogas production from anaerobic digestion of food waste and its co-digestion with garden waste. Feedstock is subjected to thermal and or extrusion pretreatment. A combination of both is the proposed novel sequential hybrid pretreatment method. Feedstock is rich in cellulose I, II, and di/monosaccharides, where pretreatment altered the characteristics and morphology with a steady neutral pH indicating stability. The resultant feedstock exhibited the absence of cellulose II and reduced disaccharides. An average of 0.25 times increase in biogas production is observed with individual thermal and extrusion pretreatment than the conventional digestion. Sequential hybrid pretreated feedstock yielded maximum biogas of 730 and 430 mL/g VSfed in mono digestion and co-digestion over its conventional counterparts. In this study, the modified Gompertz model (R2 of 0.98) is suitable over the first-order kinetics model. Results conclude that sequential hybrid pretreatment leads to significant breakage of complex organic matter in substrates aiding in the efficient digestion process and biogas generation.
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Data availability
The datasets generated during and/or analyzed during the current study are not publicly available as the work is part of CNR's Ph.D. thesis, but are available from the corresponding author on reasonable request.
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Acknowledgements
CNR thanks Management and Dean (CET), SRM Institute of Science and Technology, Kattankulathur, Chennai, and the SRMIST Directorate of Research, for their financial support in the form of a Doctoral Research Fellowship. The authors thank the SRM Institute of Science and Technology Management for their facilities and support. The authors acknowledge the Associate Director (Campus Life), SRM Institute of Science & Technology, Kattankulathur, for permitting the collection of seasonal food waste samples and data. The authors acknowledge the Head of the Department for permitting and providing the necessary laboratory and analytical facility. The authors acknowledge the Nanotechnology Research Centre (NRC), SRM Institute of Science & Technology, Kattankulathur, Chennai-603203, Tamil Nadu, for helping analyze samples using XRD, FTIR, and UV–Vis facilities. The authors acknowledge SRM Central Instrumentation Facility (SCIF), Directorate of Research, SRM Institute of Science and Technology, for its HR-SEM facility. The authors also would like to acknowledge The Director, National Centre for Sustainable Coastal Management (NCSCM), Chennai (Ministry of Environment, Forest and Climate Change (MoEF& CC)), GoI, Chennai, India, for providing CHNS analyzer facility.
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CNR: conceptualisation, methodology, software, data curation and interpretation, writing- original draft preparation, revision and finalization. PP: conceptualisation, methodology, data curation and interpretation, supervision, writing and reviewing and finalization.
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Cherukuri, N.R., Parthasarathy, P. Impact of sequential hybrid pretreatment in anaerobic digestion of food waste and garden waste co-digestion on waste characteristics and biogas production. J Mater Cycles Waste Manag 25, 2937–2950 (2023). https://doi.org/10.1007/s10163-023-01727-3
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DOI: https://doi.org/10.1007/s10163-023-01727-3