Abstract
Currently, compost derived from waste biomass is attracting attention due to the price of chemical fertilizers and other factors. However, some farmers are concerned about the quality of compost because there are no regulations on the frequency of component analysis of compost, and fertilizer components are not stable. Therefore, this study clarifies the stability of the quality of compost produced from food waste methane fermentation facilities. We also aimed to clarify the material balance of nitrogen and phosphorus, and to examine the possibility of further utilization of the compost. The analysis was conducted at a facility that produces compost by methane fermentation of food waste, and compost and its process were sampled and analyzed over an 8-week period from November 2022 to January 2023. The results of the analysis of compost components showed that fertilizer components (nitrogen, phosphorus, and potassium) were stable, and there were no significant changes in pH, EC, moisture content, or ash content. The analysis of the samples taken at the facility showed that phosphorus was recovered as a resource as compost. But half of the nitrogen was treated at water treatment facility, suggesting the possibility of using it as a liquid fertilizer.
