PLANNING OF RESIDENTIAL SCALE CENTRALIZED DOMESTIC WASTEWATER MANAGEMENT SYSTEM IN KEBAGUSAN URBAN VILLAGE, JAKARTA SELATAN

• Main Author: Yolanda Dwilestari, Roselina
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61944
• Institution: Institut Teknologi Bandung

Kebagusan urban village is one of the urban village at Pasar Minggu, Jakarta Selatan. Until today, the majority of people living in Kebagusan urban village is still using the septic tank as its technology to process the domestic wastewater they produced. However, according to those people the septic tank is rarely or even never be cleaned during its operational lifetime. To prevent the negative impact for the people healthiness and environment and also based on its services scope, the planning for Centralized Domestic Wastewater Management System or SPALD-T which consist of wastewater treatment plant (WWTP) and its piping network is the right choice to be applied in the location which consists of 50.153 person. In supporting the planning of SPALD-T, secondary data from the literature are used with conditions close to the planning location. SPALD-T planning will be implemented in a period of 20 years with a target of serving 300 families of low-income communities and household commerce in RW 07, Kebagusan urban village. In determining the chosen alternative for piping networks and processing technology at WWTP, the Simple Additive Weighting (SAW) method is used with the criteria set for the selection of alternative piping networks are construction, operation and maintenance, capital/investment costs, land requirements as well as lane crossings and supporting buildings, while for the selection of alternative processing technology in WWTPs are operations and maintenance, capital/investment costs, operational and maintenance costs, land requirements and energy needs. The piping network system that will be used is the shallow bore sewer, with the pipe type is HDPE with diameter of 0,1 – 0,2 meters, gravitation stream and the depth of excavation for pipes is between 0,6 – 6,3 meters below the surface. Wastewater processing will be carried out in the residential scale WWTP at Taman Kebagusan with the average debit input is 1,189 L/s. As for the processing units which will be used for domestic wastewater at the WWTP is equalization tank with screen, primary sedimentation tank, anaerobic-aerobic biofilters, secondary sedimentation tank, and disinfection tank. As for the sludge processing which produced from the wastewater process, the gravity thickener unit and planted drying beds will be used. The efficiency for this process will remove 93,70% of BOD, 94,15% of COD, 89,50% of TSS, 98,20% of oil and grease, 99,95% of ammonia, and 100% of total coliform. Based on the results of financial and economic analysis, the SPALD-T project in Kebagusan urban village is not economically feasible if it only relies on income (total levies) from the value of the ability and willingness to pay (ATP and WTP) of the local community. This is because if the total levy is determined based on ATP at Rp. 5,000.00/KK/month, then the NPV is worth - Rp. 5,285,705,468.00 and BCR is 0,03 and if the total levy is set at Rp. 82,000.00/KK/month, then NPV is -Rp2,689,782,908,00 and BCR 0,51. Meanwhile, if the total levy is determined based on the WTP of Rp. 10,000.00/KK/month, then the NPV is worth -Rp. 5,117,139,068.00 and BCR is 0,06 and if the total levy is set at Rp. 50,000.00/KK/month, then NPV is -Rp 3,768,607,868.00 and BCR 0,31.