Patents

The present invention provided a compact anaerobic digestion system to converts household waste biomass materials to methane rich biogas and concentrated compost slurry of about 9 to 40% solids for agriculture soil applications. The horizontal anaerobic digester vessel comprising a horizontal vessel provided with insulation and preferably cylindrical at the bottom, fitted inside of the said vessel is at least one shaft with 4-100 radial or horizontal or diagonal baffles at equal distribution , and attached with a handle or wheel outside the vessel to rotate the shaft from outside, the said vessel being provided with minimum of one port at one end for introducing the raw biomass wastes and another set of ports for discharging stabilized wastes at the opposite end, and having one valve-controlled gas port of above the level of the said port for discharging stabilized wastes , a small hand operated shredder coupled to the digester vessel for shredding/cutting/crushing large and hard solids such as bones to get particles preferably lesser than 10 mm sizes. The waste falls inside the digester and gets mixed slowly while being fed by rotating the handle attached to a shaft having baffles inside the digester.