processes. Membrane technology is becoming more important forCO2 separation from natural gas. This is due to advantages suchas operational simplicity, high reliability, low capital and operatingcost, environmentally friendly, good weight and spaceefficiency along with reduced energy consumption (Dortmundtand Doshi, 1999). CO2 membrane technology of UOP–LLC wasadopted in this study (Dortmundt and Doshi, 1999). Themembrane set up was connected with compressor booster.Compressed gas was passed through the compressor booster; itcontaining ground storage pressure of 250 bar and a flow rateof 330 m3/h. The control system and addition of CBG (CBG decantpanel) was monitored continuously by PLC (Programmable LogicController). The system performance quality and compressed gascylinders were evaluated. Gas samples were collected and analyzed.Gas improvement before and after purification yields arelisted in Table 2.Before entering the improve system biogas containing CH4, CO2,O2 are 68.8%, 29.7% and 0% with H2S 768 ppm. After the enhancementprocess CBG meet the standard of the Department of Energy;the CBG having CH4, CO2, O2 are 89.35%, 10.05 0% and 0.02% with<0.01 ppm H2S. Consequently, H2S was removed to below thedetection limit and methane content was reached about 90%. Productionof CBG was used as automotive fuel for NGV substitution.This study was examined the use of CBG for cars in Mae TaengDistrict. The upgraded biogas will be used for vehicles in ruralareas. CBG production units are installed on pig farms in MaeTaeng District, Chiang Mai Province, Thailand.
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