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Municipal Food Waste to Biomethane and Biofertilizer: A Circular Economy Concept

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Abstract

This research is a dual resources recovery approach of biomethane and biofertilizer from as received municipal food waste (MFW) using the concept of circular economy. In this research MFW is first pretreated in hydromechanical process to produce broth suitable for anaerobic digestion (AD). The MFW broth then underwent mesophilic wet AD process to produce biomethane and biofertilizer. Three selected feedstock and inoculum ratios (F/I) of 1:2, 1:1 and 2:1 by volume for 30 days retention time were considered. Among three F/I ratios, the F/I ratio of 1:1 digester was found to be the best batch condition for 30 days retention time for maximum biomethane production. MFW broth had ash content of 31.51% of total solid (TS), higher heating value (HHV) of 18.32 MJ kg−1 of TS and C/N ratio of 15.29. The batch F/I of 1:1 AD produced the maximum biomethane of 347.69 L kg−1 TS, 511.92 L kg−1 volatile solid (VS), 232.74 L kg−1 COD and 701.56 L kg−1 TOC, respectively. The biomethane was accounted for about 60% of the produced biogas in this mesophilic batch digester. Digestate was available as a liquid biofertilizer with 4.61% N, 3.33% P, 0.39% K, 1.17% S, 0.29% Ca, 0.14% Mg and 6.82% Na contents of TS of MFW broth, which will be a substitute of chemical fertilizer. This biomethane and biofertilizer can reduce GHG emission of Ontario, Canada which can contribute to the enrichment of the circular economy.

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Acknowledgements

This research was sponsored by the School of Engineering of the University of Guelph for PhD research. We are grateful to Dr. Brajesh Dubey, a former professor of the University of Guelph for arranging meeting with various municipalities, food waste and organic waste management authorities. We are grateful to the CCI bioenergy and the city of Toronto for sharing their AD hydromechanical pretreated MFW broth and providing inoculum for this research. We are grateful to the Canadian Biogas Association to arrange several visits to communicate with various AD plant owners of Ontario. We are also thankful to Prof. Sheng Chang, Environmental Engineering program, School of Engineering of the University of Guelph for kindly allowing us to use his laboratory facility for this research.

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Paul, S., Dutta, A., Defersha, F. et al. Municipal Food Waste to Biomethane and Biofertilizer: A Circular Economy Concept. Waste Biomass Valor 9, 601–611 (2018). https://doi.org/10.1007/s12649-017-0014-y

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