... 20 times worse than CO2 for green house effect. Although Biogas can be burnt as energy source, it contains H2S, ... To remove these contaminates can increase the heat value of biogas. Meanwhile, it can reduce the pollution when burn the ... untreated biogas.Main TechnologyContentRemoving TechnologyCO2Membranes, PSAH2SIron sponge, impregnated activated carbon, ...