Abstract
This research output is focused on the modified design of a low-cost biodigester using a 295L of steel drum. The system has a 15kg bio-methane storage tank of 182L with a water displacement tank of 20L standard steel drum. Incorporated into the design is a cast iron with centrally positioned four impeller shaft to enhance mixing of substrate. A floating storage tank was designed, fabricated, and used for effective storage of bio-methane; biogas was produced from mixture of cowdungs, which was filtered to remove substituent of biogas. The retention time was for 4 weeks during which the pH valve and temperature variation were noted. Maximum biogas production was attained on the 8th, 9th, and 19th day, and the total volume of gas produced ranges between 92.6 and 102 mL/day. The test result showed that methane gas produced the highest percentage of biogas. Additionally, from the result, the displacement of ethane, ethylene, propane, propylene, I-butane, nitrogen, carbon monoxide, carbondioxide and other gases were minimal compared to methane gas.
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