Bio-gas is produced due to bio-degradation of organic materials under anaerobic condition which means oxygen free environment. This research work was conducted to find out the production ability of bio-gas from mesophilic anaerobic digestion of cow dung (CD) using kaolin as an additive. Five laboratory scale digesters were constructed to digest cow dung. Each of the digesters had a capacity of 1 liter and made of glass conical flask. In the experiment 311 gm. of cow dung and 389 gm. water was used. Kaolin was added in four of the digesters with an amount of 0.4, 0.6, 0.8 and 1% (w/w). and one digester was used for digestion of cow dung without kaolin. The digesters were fed on batch basis. Total solid content was maintained 8% (wt.) in the slurry for all the observations. All the digesters were maintained at ambient temperature of 27 – 32 ͦC. Retention time was maximum 54 days for the digestions. With the addition of kaolin total biogas production was found to be increased from 3 to 15% as compared to pure cow dung digestion with 0.6% kaolin gave maximum increase. Maximum 1373 ml/day.kg CD gas was produced on the 49th day and maximum total gas was produced 14373 ml/kg CD for addition of 0.6% kaolin. Whereas without kaolin maximum 608 ml/kg cow dung gas was produced on the 52th day with total gas of 12527 ml/kg cow dung.
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