Anaerobic digestion technology is one of the emerging and very effective mode of treating the waste in the production of renewable energy. In the present world with the increase in pollution and mankind there is very much necessity for the renewable energy. In this classification system the anaerobic digesters are grouped depend on the various factors like temperature, feeding mode, solid content, number of stages, organic loading rate and biomass. There are several Fullscale case studies on anaerobic digestion technology of different parts on the globe included in the report. The potential is very well examined and explained on how important and better is the method of anaerobic digestion for the treatment of waste with production and utilization of energy which is produced by the waste treated.