Anaerobic co-digestion of forage radish and dairy manure in complete mix digesters

作者：Belle Ashley J; Lansing Stephanie^*; Mulbry Walter; Weil Ray R

来源：Bioresource Technology, 2015, 178: 230-237.

DOI：10.1016/j.biortech.2014.09.036

• Anaerobic digestion
• Cover crops
• Biogas
• Hydrogen sulfide
• Methane

Pilot-scale digesters (850 L) were used to quantify CH4 and H2S production when using forage radish cover crops as a co-digestion feedstock in dairy manure-based digesters. During two trials, triplicate mixed digesters were operated in batch mode with manure-only or radish + manure (27% and 13% radish by wet weight in Trial 1 and 2, respectively). Co-digestion increased CH4 production by 11% and 39% in Trial 1 and 2, respectively. As H2S production rapidly declined in the radish + manure digesters, CH4 production increased reaching high levels of CH4 (>= 67%) in the biogas. Over time, radish co-digestion lowered the H2S concentration in the biogas (0.20%) beyond that of manure-only digestion (0.34-0.40%), although cumulative H2S production in the radish + manure digesters was higher than manure-only. Extrapolated to a farm-scale (200 cows) continuous mixed digester, co-digesting with radish could generate 3150 m(3) CH4/month, providing a farmer additional revenue up to $3125/month in electricity sales.

• 出版日期2015-2