Evaluation of the utilization of vegetable waste (cabbage, long beans, and kale) in biogas production.

Vegetable waste is often found in traditional markets in the city of Yogyakarta. This vegetable waste is usually thrown away without further processing, even though vegetables are organic waste that can be processed into products that benefit society, biogas. Biogas is a renewable fuel from organic waste and can be considered environmentally friendly. Biogas production in this study uses vegetable waste such as cabbage, kale, and long beans—the vegetable as substrate mixed with cow dung as co-digestion and water. The mixture is then left to ferment for 30 days. The biogas produced was analyzed for volume, methane content, Chemical Oxygen Demand (COD), and acidity (pH). From the observations, cabbage makes more gas volume. The highest methane content is in kale, 0,5221 ml CH4/gr COD, which is still far from the minimum standard. COD and pH values are measured to see the quality of the waste that can meet environmental standards. This study will discuss what causes vegetable waste not to meet the criteria for methane content in biogas and how to increase methane levels in biogas from vegetable waste. In addition, it also discussed alternative biological processing of vegetable waste so that it can be utilized by the community and not wasted. [ABSTRACT FROM AUTHOR]