The Region of Jombang in East Java has Gedangkeret Landfill as its final solid waste management system. There are 50 transfer stations that are mostly located in the district of Jombang. The other transfer stations are located in the districts of Diwek, Peterongan, Mojowarno, Mojoagung, Ploso, Ngoro, Gudo, Perak, Sumobito. These transfer stations produce at least 76.11 tonnes/day of solid waste. The composition of the solid wastes dumped in this landfill is mostly food waste and plastic. The presence of biodegradable wastes will produce plenty of greenhouse gasses. The leachate produced is processed in stabilization ponds, but the value of BOD and COD is still below the quality standard. The Index Score of Gedangkeret Landfill is 538.48, indicating that the landfill needs to be rehabilitated. The rehabilitation plans comprise of dumping zone stabilization, drainage system, leachate processing, landfill gasses management, and greenbelt plan. The dumping zone planning is based on population projection. The drainage system planning is based on the Jombang climate condition. The leachate processes planning is based on the leachate flow rate on each dumping zone and its characteristics. The greenbelt planning is based on the CO 2 production and the conversion of the methane gasses.
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Mujaddid et al. (2020) studied this question.