| Title | Biorefinery approach for the management of fruit and vegetable waste generated in hotels: study case in India |
|---|---|
| ID_Doc | 15448 |
| Authors | Srivastava, V; Balakrishnan, M |
| Title | Biorefinery approach for the management of fruit and vegetable waste generated in hotels: study case in India |
| Year | 2023 |
| Published | Biomass Conversion And Biorefinery, 13, 16 |
| Abstract | This work examines the biorefining potential of mixed fruit and vegetable waste generated in hotels targeting recovery of high-value bioactive phytochemicals, biogas, and soil amender. Through a primary survey of 15 number of star-category hotels in the National Capital Region (NCR) in India, the organic waste management options being practiced were compiled. Phytochemicals recovery from the mixed fruit and vegetable waste was done employing a previously optimized solvent extraction process; this was followed by anaerobic digestion (AD) of the solid residue. Three different waste samples were tested for AD viz. without phytochemicals removal (NT), phytochemicals removal without dichloromethane (DCM) treatment (T-1), and phytochemicals removal with DCM treatment (T-2). The survey indicated that organic waste management practices in NCR hotels are variable covering a broad range-from complete in-house handling of the waste to disposal of the entire amount to urban local bodies. Removal of bioactive phytochemicals from mixed fruit and vegetable waste enhanced the AD process with shorter time lag in gas generation and increased production of biogas with higher methane (CH4) content. The biomethanation potential (L/g VS) and CH4 content (%) were, respectively, 0.198 +/- 0.06 and 41 +/- 3 (NT), 0.275 +/- 0.36 and 57 +/- 3 (T-1), and 0.303 +/- 0.39 and 62 +/- 3 (T-2); thus, the best AD performance was obtained with sample T-2. A combination of phytochemicals removal followed by AD is thus an alternative, biorefinery-based concept for managing mixed fruit and vegetable waste from hotels. The proposed process would involve a combination of physico-mechanical (shredding, drying), physico-chemical (solvent extraction, ultrasonication, centrifugation, filtration, vacuum distillation), and biochemical (AD) steps. Besides the option of upcycling the anaerobic digestion streams (CH4, CO2 and nutrients) in a bioeconomy approach, this scheme enables the recovery of high-value phytochemicals. A preliminary resource recovery estimate (per year per hotel) for sample T-2 is as follows: phytochemicals 6.2 metric tons (MT), biogas 890 m(3), and digestate 78 MT. Overall, this study is expected to contribute towards efforts in the eventual transition to a sustainable biobased circular economy. |
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