NOVELTY - A device comprises a digester chamber coupled to a sewage inlet channel to store a sewage (102) containing fresh water; digester chamber is held by multi-chambered floats forming the upper periphery; a protection jacket is multi-chambered; electrodes for detection occurrence of leakage; a plastic sheet (106) is used to cover the storage chamber; weights (108) are attached to the plastic sheet to hold in tight position; a suction channel (110) coupled to the sewage digestion chamber; and storage system made of plastic film held by multi chambered floats is provided to treat fresh water.    USE - As a device for processing sewage containing fresh water for generating methane gas used as fuel (claimed).    ADVANTAGE - The device prevents bad smell in a coastal area; and recycles the fresh water; provides digested organic matter use as fertilizer.    DETAILED DESCRIPTION - A device comprises a digester chamber coupled to a sewage inlet channel made of plastic film separator to store a sewage (102) containing fresh water, which is allowed to decompose releasing methane; digester chamber is held by multi-chambered floats forming the upper periphery; a protection jacket is multi-chambered made from plastic film encloses the storage chamber to enable detection of leakage for taking up repair; electrodes as sensors for detection occurrence of leakage; a plastic sheet (106) is used to cover the storage chamber to collect methane gas, where the plastic sheets slides over the floats; weights (108) are attached to the plastic sheet to hold in tight position, and to apply pressure to allow the flow of methane gas, where methane gas is burnt in a engine to which is coupled a electric generator to generate power; a suction channel (110) coupled to the sewage digestion chamber is provided to remove digested organic matter which is pumped out and sent to coast for use as fertilizer, where the channel runs parallel to supply channels; and storage system made of plastic film held by multi chambered floats is provided to treat fresh water that gets separated by decantation and filtration, the water treatment with at least chlorine.    DESCRIPTION OF DRAWING(S) - The figure shows view system of storage chamber.    Sewage (102)    Multi-chambered wall (104)    Plastic sheet (106)    Weights (108)    Suction channel (110)