Optimizing Waste Reduction Rate at The Integrated Waste Processing Facility in Ngipik Landfill, Gresik

The average weight of municipal solid waste disposed of at the Ngipik Landfill was 212.2 tons per day, with 94.8% directly deposited in the landfill. Based on field observation, there was existing reduction carried out by Integrated Waste Processing Facility (Tempat Pengolahan Sampah Terpadu, TPST) before the waste was deposited in the landfill. However, the exact amount of waste that could be reduced at the TPST is unknown. Further research was needed on the amount of waste that can be reduced at TPST. This data could serve as additional information in the waste material flow of Ngipik Landfill. The objectives of this study were to assess the implementation of waste reduction by TPST operational activities, then to do the calculation of waste potential weight and composition that could be reduced by TPST. The weight and composition were measured using direct measurement methods. The potential reduction of the TPST was 7.74 tons per day. The results of the TPST optimization were an increase in the amount of waste entering to 18.8 tons per day with working hours from 7:00 a.m. until 4:00 p.m., the addition of 31 people in the sorting operation, and the expansion of land to 2,521.8 m2.