Improving biogas generation from mixed waste residue using media materials
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This study involved the result presenting of previous studied that leaves and petioles of longan waste residue at the best ratio fresh: dry 3:1 was mixed with the starter from sludge of pig farm and spent wash liquor in the digestion. It focused on determination the effect of media material on biogas production from these mixed waste. Big bio media, hair roll, and bamboo wood were used as three kinds of media material for 5% by volume of the low rate improved digester size 200 l in anaerobic condition. The digester without medium was used as a control. Four sets of experiment were conducted for 2 replicates/set during October 2010-September 2011. It was found that the period of digestion was 16 days. The volume of biogas generated from different media materials used (799-926 l) was more than that from non medium used (646 l) about 19-30%. The percentage of methane (CH4) generated (53.02-64.32%) from different media materials used was also higher than that from non medium used (52.95%). %COD removal occurred from different media materials used (95.42%-95.66%) was slightly higher than that from non medium used (94.98%). Hair roll medium exhibited the good characteristic of biogas generation, particularly, CH4 yield in the digester.
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