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Abstract

Anaerobic digestion of the mix (4:1) ratio of lime-pretreated rice straw/cow dung was investigated to determine its feasibility as a feedstock to produce volatile fatty acids. Both batch and fed-batch anaerobic digestions were performed. The influence of the solid content and the addition of rumen fiber on the bioreactor performance were studied in batch system. An increase in solid content from 10 to 12% has increased toral acid concentration in liquid product from 10 to 14.69g * L ^ - 1 and productivity from 2.5 to 3.2g * L ^ - 1 * d ^ - 1 Also, the addition of rumen fiber to rice straw/cow dung has resulted in higher total acid concentration 18.97g * L ^ - 1 and higher productivity 10g * L ^ - 1 * d ^ - 1 Compared to the batch process at the same solid content of 12%, the fed-batch anaerobic digestion has resulted in higher acid concentration 25g * L ^ - 1 and higher yield of volatile fatty acids from volatile solids fed from 19 to 32% as well as higher productivity 4.4g * L ^ - 1 * d ^ - 1 Thus, the present study suggests that the volatile fatty acids' production can be optimized through fed-batch digestion and the addition of rumen fiber to the original feedstock (rice straw/cow dung).

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