NOVELTY - The plant (100) has a support structure (106) for supporting a membrane based tank (102). A gas inlet and a gas outlet pipe are attached to the tank. A moisture trap removes moisture from the biogas produced in the tank. A gas relief system controls the excess pressure inside the plant. A manual mixing system uses a hand-held mixer to mix contents of a digester and disrupt a scum layer. A treatment chamber is formed in the tank for cellulosic degradation. The moisture trap comprises a large diameter pipe for removal of moisture from the biogas.    USE - Household pre-fabricated membrane based biogas plant for treating organic waste i.e. household waste, in the absence of oxygen for producing biogas to generate household energy for cooking fuel application, lighting application and heating application.    ADVANTAGE - The plant facilitates storage of excess biogas in the biogas zone of the tank, thus enhancing overall life of the plant. The plant allows the inlet and outlet pipes to be integral to the membrane to allow the tank to be completely collapsible during packaging or transportation and to be vacuum packed to reduce the volume of the biogas created during transportation, thus reducing installation time and allowing the plant to be easily transported to a different location. The plant includes minimal welds in the gas zone, and is pre-tested for leakage under pressurized conditions before the plant is installed at the site, thus reducing the risk of biogas leakage during operation of the plant, and hence improving the operability of the plant.    DETAILED DESCRIPTION - The support structure is provided with small pieces of bamboos joined with couplers made of steel, and fiber glass, with elbows made of steel, and fiber glass.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of a biogas plant with an underground tank, a cover and a support structure.    Household pre-fabricated membrane based biogas plant (100)    Membrane based tank (102)    Cover (104)    Support structure (106)