Pengaruh Pembubuhan Tawas Dalam Menurunkan Tss Pada Air Limbah Rumah Sakit

To precipitate suspended solids in wastewater, it is necessary to take a chemical coagulant with optimum dose. The purpose in this study was to determine the optimum dose required to reduce level of TSS in the wastewater, and to obtain whether there were significant differences on the reduction of TSS before and after affixing the optimum dose of alum. The design of this study was quasi-experimental design. The variables of this study include TSS levels (dependent variable), the optimum dose (independent variables), pH, temperature, and turbidity level (confounding variable), stirring time, and stirring speed. The sampling place is fixed as control variable. Data analyzed by using paired t-test. The results of preliminary experiments fix the optimum dose of 70 mg / l. TSS parameter without alum obtained between 618 mg / l to 170 mg / l, and after affixing the optimum dose of alum, TSS dropped to between 60 - 40 mg / l. The result of statistical test obtained is p = 0,019 (there were significant differences in TSS levels before and after the affixing of optimum alum dose)