Turning Biogas Residue into Value: A Farmer-Owned Business Model for Bio-PROM in India

Turning Biogas Residue into Value: A Farmer-Owned Business Model for Bio-PROM in India

In India, the prolonged and excessive use of chemical fertilisers has contributed to soil compaction, soil acidification, loss of humus, declining soil health and environmental damage. At the same time, biogas slurry, a locally available by-product of household biogas plants, often remains underutilised. The Bio-PROM business model developed under the ProSoil project in Sindhudurg, Maharashtra, addresses both challenges by converting residue from biogas plants into phosphate-rich organic manure through a farmer-owned enterprise model. The approach links biogas-user farmers and Farmer Producer Organizations in one system. Farmers produce dry cake from biogas slurry, the Farmer Producer Organizations buy it back, processes it with rock phosphate and liquid organic fertiliser, and sells Bio-PROM to member farmers at reasonable prices, while surplus can be marketed outside the project area. The model improves soil fertility, reduces dependence on chemical phosphate fertilisers and creates an additional income stream for farmers.

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