Publication: Coagulation process of textile wastewater using composite coagulant - zinc oxide, acrylamide and tannin (zopat)
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Date
2021-09-01
Authors
Ishak, Siti Aisyah
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Abstract
Composite coagulant is known as the combination of two or more polymer into one compound either through structurally, chemically or functionally. The addition of chemical charged molecules can destabilize the suspended colloidal particles and settled down the flocs. The primary aim of this research was to synthesis composite coagulant ZOPAT from zinc oxide (ZnO), acrylamide (PAM) and tannin. To achieve this the different ratio was applied during blended technique for 24H. The jar test condition was experimented at various pH, dose, rapid mixing, slow mixing and sedimentation time to get the optimum coagulation process. Then, Response Surface Methodology was applied using Central Composite Design to achieve the optimum pH and ZOPAT dose. In addition, the formation of floc and sludge were studied and compare before the treatment. This research was the first to
incorporate zinc oxide (ZnO), acrylamide (PAM) and tannin as ZOPAT using ratio (A) 1:1:1. The optimum condition for pH and ZOPAT dosage analysed throughRSM-CCD resulted in 93% of colour, 80% of COD, 100% of turbidity and suspended solids were obtained at the pH 9.22 and 737 mg/L ZOPAT. The performance of ZOPAT indicate better sludge settleability which resulted in sludge volume index at 74.42 mL/g, and settling velocity at 1.63 cm/min. The present of Zn, N and K contribute to electrostatic attraction with the opposite charge particles. The chemical bond form between dye-particle-dye with amide, hydroxyl, carboxyl groups in ZOPAT can remove the colour, turbidity, COD and SS.