NOVELTY - The biphasic anaerobic digestion based integrated biogas generation system comprises a waste raw material receiving unit, a biphasic functional/operational mode, a shredding unit, an acidification unit, a methanation unit, a generated biogas receiving unit, a unit for receiving raw material, an effluent recirculation channel, and a unit for collecting the generated biogas. The biphasic functional/operational mode comprises an acidification phase and a methanation phase. The shredding unit comprises shredding elements and a post shredding transfer channel.    USE - The biphasic anaerobic digestion based system is useful for generating biogas from bio-origin based biodegradable waste materials (claimed) such as leafy waste, food waste, press mud, food-processing waste, tea waste, vegetable market waste and municipal solid waste.    ADVANTAGE - The biphasic anaerobic digestion based system generates the biogas in a cost-effective, an easy and an environmentally-friendly manner with less water requirement due to recycling within the process.    DETAILED DESCRIPTION - The biphasic anaerobic digestion based integrated biogas generation system comprises a waste raw material receiving unit, a biphasic functional/operational mode, a shredding unit, an acidification unit, a methanation unit, a generated biogas receiving unit, a unit for receiving raw material, an effluent recirculation channel, and a unit for collecting the generated biogas. The biphasic functional/operational mode comprises an acidification phase and a methanation phase. The shredding unit comprises shredding elements and a post shredding transfer channel. The shredding elements are configured to shred or tear the waste raw material into smaller sizes. The acidification unit comprises acidification modules. The acidification module comprises an acidification reactor component, a bag holder component, a mesh component, and a post acidification transfer channel. The methanation unit is present in the form of an upflow anaerobic sludge blanket type methanation reactor, and comprises a digester component, a settler component and a post generation gas transfer channel. The generated biogas receiving unit is present in the form of a biogas holder. The effluent recirculation channel links up the methanation unit with the acidification unit. An INDEPENDENT CLAIM is included for a method for generating biogas from bio-origin based biodegradable waste materials.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a biphasic anaerobic digestion based integrated biogas generation system.