DOMESTIC WASTEWATER MANAGEMENT SYSTEM PLANNINGIN SPESIFIC RIVERBANK AREAS(CASE STUDY: TAMBELAN SAMPIT URBAN VILLAGE, EAST PONTIANAK SUB-DISTRICT, PONTIANAK CITY)

• Main Author: Nur Azmina Rahmah, Adillah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/81955
• Institution: Institut Teknologi Bandung

The Kapuas River is the longest river and plays an important role in West Kalimantan. This strategic position needs to be accompanied by an integrated water environment management system, including domestic wastewater management. Tambelan Sampit Village, which is located right on the riverbank area, does not yet have a good domestic wastewater management system. Of the total 7,686 inhabitants in 2022, 92.71% have access to sanitation but still cannot be said to be safe. Therefore, a domestic wastewater management system planning will be carried out based on the 2018 Pontianak City RTRW document which plans a centralized system for this kelurahan. This planning includes the design of a distribution system, a centralized treatment system, and a local treatment system for individuals. Due to limited land and topographical conditions, the Wastewater Treatment Plant (WWTP) will be planned in two locations. WWTP 1 located in RW 2 will serve RW 1, RW 2, RW 4, RW 5, and RW 6 while WWTP 2 located in RW 7 will serve RW 3, RW 7, and RW 8. The wastewater distribution system (SPAL) planning is made in one line for each WWTP with a shallow bore sewer system. A discharge of 0.002 m3/s will be channeled with pipes with a diameter of 50 mm, 65 mm, and 75 mm to WWTP 1 while a discharge of 0.0028 m3/s will be channeled with pipes with a diameter of 65 mm and 100 mm to WWTP 2. Channeling uses PVC type pipes for wastewater and maximizes gravity flow. The treatment system for each WWTP is made the same by prioritizing passive treatment units to minimize costs and increase operational ease. There are 3 (three) alternative treatment configurations which are then selected using the Simple Additive Weighting (SAW) method with parameters of land requirements, ease of construction, construction costs, ease of maintenance operations, maintenance operational costs, and environmental impacts. The selected unit configuration consists of a bar screen, an equalization basin, a settler connected to an Anaerobic Baffled Reactor (ABR), a second settling basin, and a subsurface constructed wetland that functions as a disinfection unit. The sludge will be drained to a collecting basin with a draining period of 6 months and the WWTP output water will be drained to a nearby small river connected to the Kapuas River.