Bioenergy, a renewable energy holds a promising solution to the most pressing problems of energy crises and waste
treatment, disposal and thereby creating a circular economy. There is a need to exploit biogas potential to the fullest to enhance
its productivity and utilize it for heating, cooling, generating electricity and also for transportation. Valorisation of the municipal
solid waste (MSW), agricultural non-fodder waste, sewage sludge, animal waste, etc., for energy production (biogas), material
recovery (fertilizers) and waste elimination (waste treatment) attracts the attention of the researchers. This research review
highlights the crucial parameters like pH, temperature, OLR, HRT, etc. affecting the biogas productivity and provide insights to
run the digesters at optimum conditions thus optimizing the biogas yield.
