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Batch anaerobic digestion system using paddy straw and cow dung (Source:IRRI Rice Knowledge Bank) In batch anaerobic digester rice straw and cattle dung are arranged layer by layer with the top layer as cattle dung to cover up all substrates. Based on the weight, the ratio of rice straw to cattle dung is kept as 4:1 (1.6 tons of chopped straw with 15-18% MC and 0.4 tonnes of cow dung with 30-40% MC) and fed into a batch digester for 100-120 days. Biogas is generated on the 7 th day of feeding, and gives an average yield of 4-5 m 3 /day in about 100 days.

Batch anaerobic digestion system using paddy straw and cow dung (Source:IRRI Rice Knowledge Bank) In batch anaerobic digester rice straw and cattle dung are arranged layer by layer with the top layer as cattle dung to cover up all substrates. Based on the weight, the ratio of rice straw to cattle dung is kept as 4:1 (1.6 tons of chopped straw with 15-18% MC and 0.4 tonnes of cow dung with 30-40% MC) and fed into a batch digester for 100-120 days. Biogas is generated on the 7 th day of feeding, and gives an average yield of 4-5 m 3 /day in about 100 days.

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Rice straw is a low-density crop residue. It is produced in huge quantities every year across the country. Therefore, the management of rice residue has become a problem for farmers. Farmers have to vacant the field as early as possible for sowing of the next crop. Hence, they go for the burning of crop residue and now it has become the common prac...

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... generating gas from paddy straw, a smallscale a batch-anaerobic digestion (AD) system has been developed by Punjab Agricultural University (PAU), Ludhiana. The main components of this system are batchdigester and a gas holder or reservoir ( Figure 5). Both of these components are built with cement materials and the cost of the whole system is INR 150,000. ...

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