Performance Assessment of The Solid Waste Containment System at Transfer Depo (TPS) in Mulyorejo District, Surabaya City, Using Multi-Criteria Decision Making (MCDM) Method

Abstract

Mulyorejo District contributes approximately 3% of Surabaya’s total solid waste (SW) generation, with a total population of 86,545 in 2020. Therefore, a proper solid waste management (SWM) system is required. A transfer depo (TPS) is a facility to temporarily accommodate SW before being transferred to a landfill (TPA). Communal SW containers play a significant role in accommodating SW in TPS, but problems are often found. This research aims to (1) determine the current condition of the SW containment system at TPS in Mulyorejo District, (2) determine the recommended alternative of the SW containment system at TPS in Mulyorejo District based on expert judgment, and (3) determine the most suitable SW containment system alternative for TPS in Mulyorejo District. This research used the load count analysis method to determine the SW volume in each TPS. Furthermore, observation of the SW containment system in each TPS was done. In selecting the preferable alternative, the Multi-Criteria Decision Making (MCDM) – Analytic Hierarchy Process (AHP) method and Expert Choice 11 software were used to determine experts' tendency to prioritize parameters, criteria, and the preference toward SW containment alternatives. Operational cost analysis using Pacific Consultant International (PCI) and SWOT was used to select the most suitable alternative. Results of the research show that the use of 660 L containers at TPS in Mulyorejo District is inappropriately operated with the enacted regulations. The expert's preference for SW containment system alternatives at TPS in Mulyorejo District was smart container system with a weight of 0.389, prioritizing technical aspect parameters with a weight of 0.817 and operational criteria with a weight of 0.336 and operational cost criteria of 0.418. HCS was the most suitable SW containment system alternative for TPS in Mulyorejo District with an operational cost of IDR 152,676 /m3, followed by an SCS of IDR 231,633 /m3, and smart container system of IDR 115,816 /m3