4. ConclusionBiogas production is best tool to solve the problems of globalwarming, energy security and waste management. Anaerobic codigestionof the concentrated pig manure with grass silage wasused, and this research carried out in full-scale three CSTRs wasoperated at mesophilic temperature. The results obtained in thisstudy suggest that co-digestion of pig manure and grass silage isa promising approach for improving biogas production. The upgradedgas was containing CH4 (89.35%), CO2 (10.05%), O2 (0.02%)and H2S (<0.01 ppm), which were meet up the standard of theDepartment of Energy. Efficiency criteria explained good performancethroughout the study.
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