STUDY OF USING ALUM FROM BUFFING WASTE AS COAGULANT FOR TURBIDITY AND TOTAL SUSPENDED SOLID (TSS) REMOVAL

• Main Author: PERTIWI (NIM : 25312013), YUNITA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24830
• Institution: Institut Teknologi Bandung

The main problem in the utilization of surface water is poor quality water due to pollution, so that it's require the process to eliminate turbidity and Total <br /> <br /> <br /> Suspended Solid (TSS). This study focused on using of buffing waste as raw material for produce coagulant. Buffing waste derived from industrial finishing <br /> <br /> <br /> processes of automotive parts containing 65,11% aluminum. The content of Al are high on buffing waste is a potential resource to be used as raw materials for <br /> <br /> <br /> metal-based coagulant. In this study, will be studied buffing waste as coagulant and coagulation-flocculation mechanism using buffing waste coagulant. There are 2 methods to produce coagulant that will produce a coagulant Al2(SO4)3.5H2O and KAl(SO4)2.8H2O. Coagulant Al2(SO4)3.5H2O containing 44.3% sulfate, and 7% Al. While coagulant method II, the K.AI(SO4)2.8H2O containing 31.9% sulfate and 5.04% Al. The study was conducted by using jar test as a model for coagulation-flocculation process in the pH range of 6 to 8, with variation dose is 10-60 mg/L. In experiment using variations of initial turbidity (50,100, and 150 NTU), all of coagulant have same ability to remove turbidity in the initial turbidity 150 NTU, with order reaction for removal kinetics of TSS is using second order reaction. In the application to the raw water in the drinking water treatment, the optimum dose is coagulant Al2 (SO4)3.5H2O with optimum dose is 30 mg/L, it’s because hydrate content in coagulant Al2(SO4)3.5H2O more less, because more content of hydrate, the atomic <br /> <br /> <br /> composition will be reduced, thus reducing composition of aluminum ions which are active in the destabilization process of colloid. Floc characteristics formed at the optimum conditions coagulation-flocculation process, having an average particle size of 0,01 mm2 on the coagulation process and the size at the end of flocculation process is 1.9 mm2. The average settling velocity of floc particles using coagulant Al2(SO4)3.5H2O is 0.052 to 0.486 cm/sec. The volume of sludge produced using coagulant Al2(SO4)3.5H2O is 4.43mL/L of raw water. Significance test (independent-sample T test) indicates that coagulant from buffing waste have ability to remove turbidity and Total Suspended Solid(TSS) same as commercial coagulant.