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PASCA EKA PRASETYA. Ratio of Coagulant Needs of Al2(SO4)3 and PAC For Water Treatment at WTP Ciapus River, IPB Dramaga. Supervised by SATYANTO KRIDO SAPTOMO. Water Treatment Plant (WTP) IPB process water from Ciapus River by water purifying process before distributed to consumers. The type of coagulant used is Al2(SO4)3 (aluminum sulfate) or alum and Polyaluminium Chloride (PAC). This study aimed to compare the water quality by using coagulant Al2(SO4)3 and PAC in WTP Ciapus River IPB Dramaga and to find out the optimum dosage of coagulant alum and PAC . This study used a test jar method and ISO (SNI) for the analysis of physical and chemical parameters of water. The result showed that PAC was better than alum with the optimum dose of 20 ppm which produces 0.22 NTU of turbidity, 1 mg/l of TSS and 150 mg/l of TDS. With alum optimum dose of 20 ppm, the result showed 0.49 NTU of turbidity, 0 mg/l of TSS and 164 mg/l of TDS. Average costs for the use of coagulant alum and PAC were Rp. 95/m and Rp 215/m, while the mean efficiency of using coagulant alum and PAC were 91.34% and 83%. The results of water purifying process by using both coagulants meets the criteria of water quality standards in Indonesia.

Perbandingan Kebutuhan Koagulan Al2(So4)3 dan PAC Untuk Pengolahan Air Bersih Di WTP Sungai Ciapus Kampus IPB Dramaga