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Energies 2017, 10(10), 1654; https://doi.org/10.3390/en10101654

Co-Digestion of Napier Grass and Its Silage with Cow Dung for Methane Production

1
Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand
2
Faculty of Agriculture, Uttaradit Rajabhat University, Uttaradit 53000, Thailand
3
Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom 73170, Thailand
4
Research Group for Development of Microbial Hydrogen Production Process from Biomass-Khon Kaen University, Khon Kaen 40002, Thailand
*
Author to whom correspondence should be addressed.
Received: 7 August 2017 / Revised: 8 September 2017 / Accepted: 17 October 2017 / Published: 19 October 2017
(This article belongs to the Collection Bioenergy and Biofuel)
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Abstract

Methane production from co-digestion of grass with cow dung and silage with cow dung was conducted by a bioaugmentation technique. For self-fermentation, maximum methane yield (MY) of 176.66 and 184.94 mL CH4/g-VSadded were achieved at a ratio of grass to cow dung and silage to cow dung of 1:1, respectively. A higher maximum MY of 179.59 and 208.11 mL CH4/g-VSadded was obtained from co-digestion of grass with cow dung and silage with cow dung bioaugmented with anaerobic sludge at a ratio of 3:1. The solid residue left over after co-digestion at a ratio of 3:1 was pretreated by alkaline plus enzyme before used to produce methane and a maximum MY of 333.63 and 301.38 mL CH4/g-VSadded, respectively, was achieved. Overall power generated from co-digestion of grass with cow dung plus pretreated solid residues and co-digestion of silage with cow dung plus pretreated solid residues were 0.0397 and 0.007 watt, respectively. View Full-Text
Keywords: energy crop; renewable energy; animal manure; bioaugmentation; biogas energy crop; renewable energy; animal manure; bioaugmentation; biogas
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Prapinagsorn, W.; Sittijunda, S.; Reungsang, A. Co-Digestion of Napier Grass and Its Silage with Cow Dung for Methane Production. Energies 2017, 10, 1654.

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