DEVELOPMENT DESIGN WITH ADDITION OF NEW WATER TREATMENT PLANT (WTP) IN LEGONG WTP LOCATION PDAM TIRTA ASASTA KOTA DEPOK

• Main Author: Bening, Mariah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42229
• Institution: Institut Teknologi Bandung

PDAM Tirta Asasta is a company that supplies drinking water in Depok City. In 2017, based on marketing division in PDAM Tirta Asasta, there are 64010 connections that have been supplied. The existing connection can cover 16,39% of population in Depok with total of 2.257.414 people. However, the percentage is still far from the national target in Indonesia’s universal access program that states 60% covered by the piping connection system (Rencana Strategis BPPSPAM 2018-2022). For the development, PDAM Tirta Asasta planned to upgrade its capacity, including Legong WTP’s capacity. With Legong WTP’s existing capacity of 620 lps as its existing capacity, PDAM Tirta Asasta will upgrade its capacity by uprating the existing water treatment plant to 1290 lps in 2020 and also set a new authorization to get 2000 lps for its raw water capacity from Ciliwung river. Therefore, in this development design the objective is to optimalize the raw water capacity by adding a new treatment plant with capacity of 710 lps. The raw water quality test shows that to achieve the drinking water criteria the parameters that has to be processed are turbidity, BOD, COD, Methylene Blue Active Substances (MBAS), H2S, fecal coliform, and total coliform. The treatment design plan will use the conventional system which consists of coagulation-flocculation-sedimentation, continued by filtrartion and disinfection. Then a decision was made to chose the sedimentation unit with alternatives of horizontal basin with settling equipment, upflow clarifier, and flocculation-sedimentation basin, the result show it’s best to use horizontal basin with settling equipment. Then, a decision also made to chose the settling equipment. With the alternatives of plate settler, hexagonal tube settler, and chevron tube settler, the alternative that is chosen is the hexagonal tube settler. The treatment units mostly use the hydraulic principal. With coagulation unit using weir mixer, flocculatiun unit using vertical baffled tank, sedimentation using horizontal basin with tube settler, filtration using rapid sand filter, and disinfection using chlorine and injected also in weir mixer.