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- Title
Biochemical Methane Potential of Spent Coffee Grounds Via Co-digestion with Food Waste.
- Authors
Teixeira, Roberta Arlêu; Bueno, Bárbara Almeida; Borges, Raquel Machado; Bringhenti, Jacqueline Rogéria
- Abstract
This study evaluated the biochemical methane potential (BMP) of two types of spent coffee grounds (SCG) via anaerobic co-digestion with food waste. A domestic spent coffee ground (DSCG), from coffee infusion, and an industrial spent coffee ground (ISCG), from Brazil's soluble coffee producing industry, were used as substrates. The co-substrate of food waste was obtained from a restaurant and the sludge from an upflow anaerobic sludge blanket (UASB) reactor was used as inoculum. Triplicates of anaerobic batch reactors (250 mL) were fed with SCG in the proportions of 0%, 25%, 50%, 75%, and 100% of dry weight, using a substrate/inoculum ratio of 1. The BMP tests were performed for 45 days at a mesophilic temperature (35 ± 2 °C). The highest levels of BMP were detected with 25% DSCG (0.345 Nm3CH4/kgVS), 25% ISCG (0.351 Nm3CH4/kgVS), and with 75% of DSCG (0.301 Nm3CH4/kgVS). On the other hand, 75% of ISCG presented a low percentage of BMP (0.188 Nm3CH4/kgVS), due to inhibitor compounds release as the percentage of added SCG increased. Results indicate that either domestic or industrial SCG has the potential for energy recovery via anaerobic digestion (AD). Therefore, AD is a promising alternative for SCG valorization.
- Subjects
BRAZIL; COFFEE grounds; FOOD waste; INSTANT coffee; ANAEROBIC digestion; METHANE; BIOGAS production
- Publication
BioEnergy Research, 2024, Vol 17, Issue 2, p1133
- ISSN
1939-1234
- Publication type
Article
- DOI
10.1007/s12155-021-10351-8