Processing of Biogas Slurry Waste from the Integrated Resource Recovery Center (IRRC) Pasar Mantung Into Solid Fertilizer Based on Circular Economy

This community service program aims to optimize the utilization of slurry waste from the Integrated Resource Recovery Center (IRRC) Pasar Mantung into solid fertilizer based on a circular economy approach. The activities included slurry sampling, laboratory testing of NPK content, solid fertilizer formulation, technical training for IRRC operators, and the establishment of a micro-enterprise group for fertilizer management. Laboratory test results showed that the IRRC slurry-based solid fertilizer has a neutral pH (6.6), high organic carbon content (26.82–41.47%), and an ideal C/N ratio (12). Although the potassium (K) content (0.37%) remains low, the fertilizer has met the basic criteria for viable organic fertilizer use. The program also resulted in improved farmer capacity in waste processing and the implementation of circular economy practices in the Pujon region.