This study aimed to assess the effect of producing methane. The ferment among pig manure with napier grass fresh. For use as alternative fuel By studying the fermentation among pig manure with napier grass fresh 4: 6, 5: 5 and 6: 4 in the waste water treated primarily from digester biogas, 20 liter reactor stirred completely. (CSTR) under anaerobic conditions at a temperature of 45 ± 2 ° C, control agitation at 60 rpm and the duration of fermentation 13 days of trial results. The proportion of the pigs on napier grass, fresh 4: 6, 5: 5 and 6: 4 to yield methane (CH4) at 0.275, 0.266 and 0.248 cubic meters of methane per kg solids Volatile sequence has the potential to degrade. Methane to 52.70 percent - 54.20 percent.
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