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Many NGOs which work for upliftment of Tribals, all over the world, have found this model very effective. There are two schemes.
Seed cake has C:N ratio of 40. Most of the Carbon is converted to BioGas and C:N ratio is reduced to 10. Large protein molecules in cake are broken down to smaller molecules. The cake coming out of BioGas plant is then further processed in a simple, low cost, BioFertilizer plant as shown below. The smaller protein molecules are further broken down in BioFertilizer plant, which can be absorbed by plants as fertilizer.
In the sheds the seed cake is eaten by earthworms and bacteria to produce BioFertilizer. Water is sprinkled on the cake heap, which is kept moist at all times. It is turned upside down once a day. It takes 3 to 4 months to complete the process. It provides employment to a number of tribals.
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