ANALYSIS OF WATER TURBIDITY REMOVAL OF SURABAYA RIVER USING THE COAGULANT OF PAPAYA SEED POWDER AND PAPAYA SEEDSDIDIK SUPRAWITO, MOHAMMAD RAZIF AND MARITHA NILAM KUSUMAAbstract Water is a source of life for human survival and very important for sustainable development.Therefore, clean and safe drinking water is essential for human life. Increasing wastewater from industrial, domestic, and agricultural activities will have an impact on increasing river water pollution as raw water for drinking water. This study aims to determine the ability of papaya seeds as natural coagulants in the form of powder and seeds to reduce turbidity levels (NTU) of Surabaya River water which is raw water for drinking water of Surabaya city residents. The research method used in this study was an experimental laboratory method for the coagulation process of flocculation using a jar test with coagulant dose variations and pH. The results of this study concluded that the coagulant of papaya seeds with a dose of 0.3 g / L at pH 3 could remove the turbidity of Surabaya River of 99.92% from 1235 NTU to 7.11 NTU. The powder coagulant of papaya seeds at a dose of 0.2 g / L at pH 3 could remove the turbidity of Surabaya River of 99.94%from the initial turbidity of 1235 NTU to 9.82 NTU. |