Int. J. Biosci.14( 2), 81-90, February 2019
Due to the inefficient transportation and inability to preserve those agricultural products can be rotten and wasted. As a solution, to determine the viability of the selected vegetable wastes co-digested with cow and pig manure as a feedstock to produced biogas. The experiment conducted in a batch-type anaerobic co-digestion process under the mesophilic condition for 30 days of digestion. Agricultural products such as cabbage, Chinese cabbage, and lettuce are mixed with cow and pig manure subject to different particle sizes of 2.00 mm, 4.00 mm and 6.35 mm. Based on the experiments, it was observed that the temperature of the digester over the 30 days digestion period was 28 – 31 oC. Moreover, the effect of smaller particle size shows the highest biogas volume production of 1733.70 ml than the other particle sizes. In addition, the carbon dioxide concentration recorded as 14 – 16%, as well as the hydrogen sulfide concentration of 6 – 18 ppm. Furthermore, the effect sodium hydroxide buffer solution improves the pH concentration of the substrate but it does not reach the required pH values for methane formation which is 7.0; and other vegetable wastes such as lettuce, cabbage resulted in the failure of biogas production due to ammonia inhibition that affects the methane production process. Thus, the biogas production from these wastes can be used as an energy source for cooking, heating, and power generation applications.
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