Small scale bioreactor studies for sustainable municipal solid waste Most of these wastes are hazardous and are poses health challenges to the environment. The main advantages of the MBR system compared to activated sludge is that it consists of relatively small installations that enable high quality effluent to be obtained with low production of slurry. This system is suitable for treating both urban waste water and biodegradable industrial waste water. Keywords: biomethane; pre-treatment; anaerobic digestion; biogas upgrading; greenhouse gas to tap the spatially distributed potentials of organic wastes or residues, e.g., More reactors in biodegradable waste. F