Analisa Perbandingan Koagulan Aluminium Sulfat dan Aluminium Clorohidrat terhadap Air Baku di PDAM Tirta Musi

Sari

Coagulation are a step in water purification carried out using a coagulant as a floc binding agent in raw water. Many types of coagulants are used in the coagulation process, including aluminum sulfate and aluminum chlorohydrate. This study aims to compare the effectiveness of the use of the two coagulants in raw water in PDAM Tirta Musi. The testing process had carried out when the pH of the raw water had high and using the jar test method. A jar test had a test method to determine the ability of a coagulant and determine the optimum dose in the process of purifying water and wastewater. After testing, the results were obtained in the form of a significant decrease in turbidity value along with an increase in the dose of coagulant added. In the aluminum chlorohydrate coagulant, the water condition started to clear at a dose of 20 ppm, and in the aluminum sulfate coagulant, the water condition started to clear at a dose of 95 ppm. The addition of aluminum sulfate dose is inversely proportional to the pH of the raw water, but for aluminum chlorohydrate coagulant its use doesn't affect the pH conditions of the raw water. At high water pH, the use of aluminum chlorohydrate is more effective because the dose used had only small and makes the use of aluminum chlorohydrate more economical. However, for aluminum sulfate coagulant at normal water pH conditions, its use is preferred, because the effectiveness of aluminum sulfate coagulant increases when water pH is normal.