The system is first loaded with a slurry of about 20 kg of cattle dung, waste flour or starch and water.: The bacteria present in the intestine and consequently in the dung of the cattle are the bacteria that will break down the organic material into methane and carbon dioxide. After a waiting time of about 2 weeks, the gas should start to be emitted and the upper tank will raise. Test the gas by burning it: if it is combustible, you can start adding high calorie material.
Feedstock: daily 1 kg to 1,5 kg mashed feedstock mixed with 10 to 15 litres water in the morning and the same in the evening.
The feed can be waste flour, vegetable residues, waste food, waste oil, fruit peelings and rotten fruit. Oil cake, left over from oil-pressing, is another useful feedstock. Even rhizomes of banana, canna, nutgrass, non-edible seeds (e.g. Leucaena, Sesbania, tamarind, mango kernels) and spoilt grain serve as excellent feedstock material. Feedstock with large lumps (more than 20 mm) should be broken up with a food blender. Hand and pedal powered food blenders are being developed, for when electricity is not available.
The digester should provides a steady supply of gas, typically 250 g of gas per day from 1 kg (dry matter) of feed.
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