biogas [2014]

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  • Bio gas for villageBio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methanewhich is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion.

  • Objectives 1. To provide fuel for cooking purposes and organic manure to rural house holds through family type Bio Gas Plants.2. To mitigate drudgery of rural women, reduce pressure on forests and accentuate social benefits.3. To improve sanitation in villages by linking sanitary toilets with bio gas plants.

  • Construction Technique Need to keep in Mind Site SelectionDigging of the pitFoundation layingMachinery construction workLaying of pipeline and accessoriesPrecautions in lying pipelines.

  • A lay out Model of Gobar gas plant

  • Components required for Bio gas plantMixing tank and inlet Digester Gas holder or gas storage dome Outlet and compost pits Gas main outlet and valve, pipeline, water fittings, gas stoves, lamp and similar appliances run on bio gas.

  • Feeder (Raw materials) from the Villages Cow dung Human waste (link latrine to the Gas plant)Animal wastelivestock and poultry wastes, night soil, crop residues, food-processing and paper wastes, and materials such as aquatic weeds, water hyacinth, filamentous algae, and seaweed.

  • Construction ProcessFirst a pit is dug, perhaps ten feet deep. Then a water-tight cement cylinder (with brick or gravel) is constructed. Next, a wall is built across the middle, extending up from the bottom, not quite to the top. Intake and outgo pipes are installed. The whole unit is water-tight.

  • The manure is mixed with water in the Intake basin to make a slurry, which then goes down the pipe to the bottom of the left side. This side of the cylinder gradually fills and overflows to the right side. Meanwhile, the whole mass bubbles methane up to the top. It collects under the large metal bell-like cover. The gas builds pressure, and can be taken off through a rubber tube to a gas stove in a kitchen.

  • When both sides of the cylinder are full, the effluent flows out from the bottom of the right side each time more raw manure is added to the left. What comes out on the right is of more value as fertilizer than the raw manure. So the methane is an added byproduct literally "something for nothing," once the capital expense of the construction is paid.

  • Uses of Gobar GasGenerally the uses of the gas can be as under:-1) cooking 2) lighting 3) Motive Power a) run pump set b) chalf-cutter 4) can produce electricity. Motive Power can be produced by linking the Gobar Gas to a duel fuel engine, specially designed for Gobar Gas.

  • Advantages (a) Large cattle population in the countryside ensuring steady source of supply of the raw material required for running the gas plant.(b) Helps in reducing the deforestation as it arrests for cutting of trees for firewood.(c) Helps in maintaining ecological balance.(d) Helps in rural sanitation(e) Lower capital cost and almost cost free maintenance.(f) Removes drudgery of women.

  • Model of Gas plant

  • Pictures