This project aims to design and build biogas from napier grass for use in households and small enterprises. Has designed biogas from napier grass plastic bucket 200 liter reactor or fermentor. The 120 liter tank is a tank of gas. With anaerobic fermentation. Start by preparing microbial fermentation biogas from the fermentation of fresh cow manure, 15 kg for a period of 5-7 days, then added 30 kg of napier grass or volume three in four of the reactors down only once. The reactor has a stirrer to mix. The rate of stirring 5 minutes / day period was 50 days and store the gas by measuring the height of the gas storage tank found throughout the experimental biogas accumulation of fermentation. 6 cubic meters of biogas (gas) or LNG volumes equivalent to 2.76 kilograms, representing the cost of buying hay and grass for use in biogas fermentation. 25.23 baht and 18.70 baht per kilogram respectively, the two cases were compared to the purchase of LPG in the tank that will be used 15 kg of LPG, which cost 400-410 baht or 26.70 per kg. THB found that the fermentation biogas from napier grass is better value. The lower cost than buying gas for their own use 1-8 baht per kg, depending on the materials for the production of biogas fermentation system with napier grass.
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