4.6 Article

Dynamic Effect of Operational Regulation on the Mesophilic BioMethanation of Grape Marc

期刊

MOLECULES
卷 26, 期 21, 页码 -

出版社

MDPI
DOI: 10.3390/molecules26216692

关键词

anaerobic digestion; grape marc; mesophilic; substrate-to-inoculum ratio; waste management; winery

资金

  1. Commonwealth Government of Australia: RTP Scholarship

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The study found that using proper operational controls and sludge inoculum can effectively enhance methane yield and increase the conversion of digestible organics when extracting methane from grape marc. Additionally, molecular analysis identified key microbial species playing core roles in trophic relationships.
Wine production annually generates an estimated 11 million metric tonnes of grape marc (GM) worldwide. The diversion of this organic waste away from landfill and towards its use in the generation of renewable energy has been investigated. This study aimed to evaluate the effectiveness of operational parameters relating to the treatment regime and inoculum source in the extraction of methane from GM under unmixed anaerobic conditions at 35 & DEG;C. The study entailed the recirculation of a previously acclimated sludge (120 days) as downstream inoculum, an increased loading volume (1.3 kg) and a low substrate-to-inoculum ratio (10:3 SIR). The results showed that an incorporation of accessible operational controls can effectively enhance cumulative methane yield (0.145 m(3) CH4 kg(-1) VS), corresponding to higher amounts of digestible organics converted. The calculated average volumetric methane productivity equalled 0.8802 L CH4 L-Work(-1) d(-1) over 33.6 days whilst moderate pollutant removal (43.50% COD removal efficiency) was achieved. Molecular analyses identified Firmicutes and Bacteroidetes phyla as core organisms for hydrolytic and fermentative stages in trophic relationships with terminal electron acceptors from the methane-producing Methanosarcina genus. Economic projections established that the cost-effective operational enhancements were sustainable for valorisation from grape marc by existing wineries and distilleries.

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