Study on medium/high rank coal-producing methane with hydrogenperoxide pretreatment

Based on the theory that hydrogen peroxide (H2O2) could effectively act on some chemical bonds in coal and convert the macromolecular structure into small organic compounds,the biomethane generation from solid phase products,liquid phase products,and their combinations in medium/high coal with three different concentrations of H2O2 pretreatment were studied.The results showed that the methane yield was the highest when the liquid product was degraded alone.The methane production was increased by 161% and 338% for high-rank coal and medium rank coal respectively.The biomethane production of high rank residual coal was positively correlated with H2O2 concentration.From the perspective of mixed degradation gas production,the methane production from middle-rank coal and high-rank coal pretreated with mass fraction 0.05% H2O2 had significant increase compared with that from raw coal.Based on the results above,two industrial application methods were proposed: directly injecting H2O2 or pretreatment liquid into coal seam.The test results proved that both methods using 0.05% H2O2 could achieve the increase of biomethane production.Specifically,the methane production from high-rank coal was increased by 96% and 106%,respectively,while that from medium rank coal was increased by 38% and 198% respectively.The research results provide an effective way for accelerating the anaerobic biodegradation of coal,which lays a foundation for the field application of microbial production of coalbed methane.