School of Renewable Energy Maejo University ChIANG mai, Thailand Potential Development of Compressed Bio-methane Gas Production from Pig Farms and Elephant Grass Silage for Transportation in Thailand Assist. Prof. Dr. Natthawud Dussadee, M.Sc., M.Eng., Ph.D., Tel./fax.: 0 5333 3194 *Email: natthawud92@gmail.com Objectives Abstract This research project evaluated biogas production using anaerobic co-digestion of pig manure & elephant grass silage in large scale to delivered transportation directly for cars. In the form of compressed bio-methane gas (CBG) production was 4,400 m3/day (CH4 60–70%) amount of CBG was 9600 m3/day. To produce large amount of biogas yield from pig farms and co-digesting with elephant grass and to deliver the transport directly To strengthen the Thailand biogas market Methodology The farm has 35,000 pigs, were produce fresh active substrate about 10–12 tons per day mixed with the effluent a day and the farm size is about 300 m3. Elephant grass was collected from the agriculture form (Mae Taeng district, Thailand.) Elephant grass silage was used about 20–23 tons per day which was grown at 45 days period. Silage particle size was 1.0 mm. In this study performed with continuously stirred tank reactors (CSTRs) and triplicate production units were used; each unit having a working capacity of 1700 m3 per tank and a volume control for consistent feed. CSTRs were placed on a three-position stirrer hotplate system. Results Conclusions and Remarks Development of Biogas from Pig Farms & Elephant Grass to Vehicles Fuel (CBG). Development of Biogas from Pig Farms & Elephant Grass to Vehicles Fuel (CBG). Table: Test and evaluation of the system performance. Feed source & Fermenters (CSTR)  Comp-onent Biogas production analysis Before system improve After system improve-ment Standards (Dept. of Energy)  Test method (ASTM) CH4 68% 89.35% Not < 65 D1945 CO2 29.7% 10.05% Not > 18 O2 0% 0.02% Not > 1.0 H2S 768 ppm <0.01 ppm Not > 23.0 mg/m3 GC Gas Dryer (Molecular sieve) H2S removal unit Gas compressor 20 bar Membrane Unit (Filter Coalescers, Guard bed, Partical filter & CO2 Membrane) Booster compressor 250 bar CBG To Vehicles Committed to produce graduates with rich of wisdom, fortitude, endurable, to be moral and ethical persons. To support the energy development of the country's energy crisis.