07-01-2013, 04:43 PM
Construction Manual of Bio-gas Reactor
Construction Manual of Bio-gas.pdf (Size: 389.23 KB / Downloads: 88)
Planning
Criteria for Bio-gas Plant Construction
Family size
4.1.1 Farmer who wants to build a bio-gas plant must have animals to sustain the operation of the plant. The minimal number of animals required are :
Cows or buffaloes at least 3
Breeding pigs at least 10
4.1.2 Stationary enclosure which is not more than 20 meters from the bio-gas construction area.
4.1.3 Animal should remain enclosure all night or for a minimum of 12 hours.
4.1.4 There must be drainage alley connected directly to the bio-gas plant.
4.1.5 Access to ground water all year round and the water source should not be further than 20 meters from the bio-gas plant.
4.1.6 bio-gas usage should not be placed further than 100 meters form the plant.
4.1.7 Farmer and his family members must have interests in using gas, fermented manure and want to build a bio-gas plant to reduce the pollution in environment.
4.1.8 Required budget, materials and labour to build bio-gas plant.
4.1.9 Time and labour in maintenance bio-gas plant.
Design of Bio-gas Plant
The fixed dome bio-gas plant buried underground. There are 3 main connecting parts :
4.2.1 Mixing chamber: where animal excrement is mixed with water before it is poured into digester chamber.
4.2.2 Digester chamber: where excrement and water are fermented. Methane and other gases will be produced in the chamber and these gases will push manure and slurry at bottom of the floor into expansion chamber.
4.2.3 Expansion chamber: collects excess manure and slurry. When gas is being used, manure and slurry will flow back into digester chamber to push gas up for usage. When the excess manure exceeds the volume of the chamber, the manure will be drained out.
Location of the Bio-gas Plant
The plant should not be located further than 5 meters from the enclosure. The digester chamber must be in an open area and should not be near any water source or natural water as animal excrement may seep into underground water. The plant should also be situated on a slope and not on the low land to avoid the danger of floods. The excess manure from expansion chamber should flow into the farmer’s field or the storage tank and not into natural water bodies such as rivers to avoid the risk of pollution.