REDESIGN OF TIRTAWENING DAGO PAKAR TREATMENT PLANT IN PREVENTION OF TRIHALOMETHANE FORMATION

• Main Author: Septiani Mulyawan, Sania
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/40151
• Institution: Institut Teknologi Bandung

Dago Pakar Water Treatment plan is under Regional Water Supply Company (PDAM) Tirtawening Bandung City has 600 liters/ second capacity from Bantar Awi water intake, Cikapundung River. Based on Cikapundung River water quality the quality are not meet standard for raw water in purpose of drinking water in refers to COD concentration 50,16 mg/L (quality standard 10 mg/L PP 82 Years 2010) and TOC 5,88 mg/L quality standard <2 mg/L Ireland EPA recommendation).Organic matter (precursor) can react together with free chlorine and formed trihalomethane (carcinogenic to human) . Therefore removal of organic matter is needed to prevent the trihalomethane formation by lowering the TOC concentration in raw water 66%. Furthermore, IPA Dago Pakar sometimes conduct pre chlorination in raw water to remove odor and color while the concentration of organic matter still high with the result of increasing the formation of trihalomethane in raw water. IPA Dago Pakar is not supported by sludge treatment unit, thus the produced sludge will drain directly to the river. Therefore, IPA Dago Pakar recommendations are lowering the concentration of trihalomethane precursor and trihalomethane formation potential, selection of disinfection process, and sludge handling unit. For the first alternative uses enhance coagulation and powdered activated carbon (PAC) addition as coagulant aid, activated carbon column (GAC), chlorine gas disinfection, sludge drying bed and gravity thickening. For the second alternative uses enhance coagulation, activate carbon column (GAC), chlorine gas disinfection, sludge drying bed and gravity thickening. Last alternative uses enhance coagulation, activated carbon column (GAC), chlorine dioxide chloramine, sludge drying bed and gravity thickening. Three alternative given are assessed by removal efficiency, land used, investation cost, maintenance and operation cost, operation and technical, produced sludge, energy demand and the results is the second alternatives selected. Second alternative could removed 71% of TOC thus meet the standard quality of Ireland EPA <2 mg/L.