Optimization of process parameters for accelerated methane yield from anaerobic co-digestion of rice straw and food waste

Jyoti Kainthola, Ajay S. Kalamdhad and Vaibhav V. Goud

Renewable Energy, 2020, vol. 149, issue C, 1352-1359

Abstract: Biogas production from agricultural residue by anaerobic digestion is the most favourable option for providing sustainable energy and reducing the environmental pollution. The experimental methane potential of co-digested rice straw and food waste were measured for different carbon to nitrogen (C/N) ratios in 1 L anaerobic reactor. Co-digesting rice straw with food waste for C/N 25, 30 and 35 almost showed the similar methane yield 294.17 ± 3.78 mL/g-VSadded, with an increase of 134.53 mL/g-VSadded (71.09%) than mono-digestion. After optimizing the C/N ratio for co-digestion, interactive effect of initial pH and food/microorganism (F/M) ratio were also explored in this study using central composite design – response surface methodology (CCD-RSM). Results from the optimization study showed significant interaction, and validation experiment for optimum condition (C/N 30, pH 7.32, F/M 1.87) showed a methane yield of 323.78 mL/g-VSadded (94.41%), 166.54 mL/g-VSadded higher than the mono-digestion (control).

Keywords: Rice straw; Co-digestion; Food waste; Response surface methodology (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (8)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:149:y:2020:i:c:p:1352-1359

DOI: 10.1016/j.renene.2019.10.124

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