Abstract: Centralized Anaerobic Digestion (CAD) power plants are renewable energy solutions which generate electricity and heat from the combustion of biogas produced from animal manure and other organic wastes. Odour and Volatile Organic Compounds (VOC) emissions from these plants unless controlled are bound to constitute menace to the environment. In this review, biofiltration was established as the most suitable abatement technology for odorous VOC removal in the waste air stream of biogas plants. While other technologies often generate secondary wastes which require further treatment down stream there by incurring more costs, biofiltration does not and is often found less expensive. However, making a good design of a biofilter demands careful considerations of the bed material, microbes to be employed and a thorough characterisation of the polluted gas stream to be treated. This assessment report also examined the technical impacts of adopting this biological technology which has found application in publicly-owned treatment works, the pulp and study industry among others.