The present study provides a comprehensive overview on biogas production enhancement techniques in anaerobic digestion from various biomass wastes. Co-digestion, two-phase digestion, recirculation of slurry, thermal pretreatment, alkaline pretreatment, acid pretreatment, ultrasound pretreatment, hydrothermal pretreatment, and milling pretreatment are some of the techniques used to improve the biogas production. Co-digestion significantly improves the biogas production compared to other processes. Pretreatment before anaerobic digestion increases the biogas yield, especially the hydrothermal pretreatment of rice straw increases the yield of biogas. In addition, thermal and mechanical pretreatment of barley straw increases the biogas production by 40.8 and 50.2, respectively. Information on different biomass waste components is important for the efficient implementation of anaerobic digestion and maintaining the key parameters within the desired range will also boost biogas production.
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