Chiang Mai Journal of Science

     Plastic waste management in Thailand remains a major challenge, largely due to household waste. Most plasti c waste is currently managed through landfi lling. Implementi ng energy recovery methods by pyrolysis is crucial to miti gate this problem. This study investi gated the properti es and performance of pyrolysis oil from landfi lled plasti c waste and blended with diesel in diff erent rati os for applying diesel engine generators. The chemical analysis by FTIR technique showed that the pyrolysis oil had a compositi on close to that of diesel, with suitable C-H and C=C functi onal groups for combusti on. The results revealed that the blended oil’s fl ash and igniti on points increased with the proporti on of pyrolysis oil. The pyrolysis oil and diesel blending rati o of 40: 60 obtained the highest fl ash point at 88.67°C and igniti on point at 91.33°C, indicati ng enhanced combusti on effi ciency. Meanwhile, the 30:70 blending rati o demonstrated the opti mal specifi c fuel consumpti on (BSFC) and achieved the highest engine effi ciency at 84.94%. Regarding exhaust emissions, all blending rati os resulted in a slight increase in nitrogen oxide (NOx) emissions,while sulfur dioxide (SO₂) was not detected in any blend. Pyrolysis oil shows promising performance as an alternati ve fuel, parti cularly when uti lized in opti mal blend rati os, as it not only reduces the environmental burden of plasti c waste but also contributes to the preservati on of fossil fuel resources for future industrial applicati ons.