Riverbank filtration project at cilandak as a solution of limited water supply in South Jakarta - Indonesia

Jakarta, capital city of Indonesia, has a population of 9.5 million inhabitants, population that increases significantly during working hours. Jakarta suffers a deficit of clean water supply due to limited raw water availability delivered from Jatiluhur dam, located 70 km away, and the deteriorating water quality of Jakarta's rivers. PALYJA, operator of water services of West Jakarta, manages three WTP producing 75% of distributed water (6 m(3)/s) and purchasing bulk treated water to complete the supply (2 m(3)/s). In Cilandak, a 400 l/s WTP fed by the increasingly polluted Krukut River, PALYJA opted by Riverbank Filtration (RBF) as a solution in order to improve raw water quality and quantity reducing the impact of dry season trough aquifer storage. RBF is a cost-effective, natural treatment technology that takes advantage of geological and biological natural filtration, instead of chemicals use, to obtain surface water and groundwater supplies. By mid 2010, the project started with the study and pumping test in two new pilot wells, confirming very good quality and quantity of the leakage from Krukut River. The project is ongoing, drilling and equipping 10 wells to obtain 150 l/s additional water for Cilandak WTP by the 2nd semester of 2011.