This project aims to design and build the system, producing biogas from grass nepia to household and small business. Production system design has made a biogas from large plastic tanks used by nepia grass 200 liter tanks and fermentation tanks as members or use 120-litre size tank is a tank of gas catchment. By means of fermentation of air wireless Biogas fermentation system, start by preparing the microbes from the fermentation of fresh cow manure 15 kg for a period of 5-7 days after that, fill the grass 3 volume 30 number nepia kg or in 4 members of the cylinder down once in the tank, there are members who mix stir paddle stirring rate mix 5: 00.T/day. Use the time to try all 50 days and keep the resulting biogas by means of measuring the altitude of the gas tank. Found throughout the experiment has accumulated quantity of biogas fermentation system for bio-gas, equivalent to 6 cubic meters (gas) or equivalent quantities of cooking gas is equal to 2.76 kg by cost when buying grass and grass planting system for use in the case of fermented biogas is 18.70 baht 25.23 per kg. Baht respectively. When both cases came in comparison with buying cooking gas in the tanks will be used as the current size of 15 kg of cooking gas, which has a price of 400-410 baht is THB 26.70 kg found that biogas fermentation from the grass over nepia is cost-effective because it has lower costs to buy gas from 1 kg Manual-8 baht, depending on the value of materials and equipment for production of biogas fermentation system from grass nepia.
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