Biogas production from sunn hemp
by Nusara Sinbuathong; Roj Khun-Anake; Suriya Sawanon
International Journal of Global Warming (IJGW), Vol. 19, No. 1/2, 2019

Abstract: Sunn hemp at a cutting age of 50 days was investigated for biogas production by studying the anaerobic digestion of sunn hemp alone and the co-digestion of sunn hemp with cow dung at a concentration of 20% by fresh weight but with various proportions. The single-stage, semi-continuous reactors were operated at a hydraulic retention time of 40 days. Mixed ruminal microorganisms from cows were used as inoculum. The results indicated that the CH₄ content from the digestion of sunn hemp alone was 47.57% and the CH₄ produced per area of cultivation was 9,231 m³/hectare.year. Co-digestion could increase the CH₄ content to greater than 50%. Proportion of sunn hemp:cow dung:water of 10:10:80 by fresh weight was optimal for co-digestion. At this recommended ratio, the CH₄ yield reached 412 L/kg total volatiles solids degraded. Sunn hemp could be a very good renewable energy source for biogas production.

Online publication date: Mon, 26-Aug-2019

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