Optimizing Coagulant-FlocculantComposition to ReduceDissolved Zinc inElectroplating Effluent

Abstract

Electroplating liquid waste creates toxic metal-organic complexes, posing a considerable environmental hazard. The primary problem is determining the most efficient and ecologically beneficial approach for processing this waste. One promising approach is the coagulant-flocculant procedure. This study focused on establishing the optimum combination of coagulant and flocculant to decrease Zn heavy metal liquid waste. The research involved experimenting with various compositions of pH, PAC (Poly Aluminium Chloride), and anionic polymers. The jartest equipment was applied to analyze changes in Total Dissolved Solid (TDS), Zn levels, and turbidity. The findings revealed that the optimal conditions were obtained at pH 8 with 40 ppm coagulant and 0.1 ppm flocculant. TDS increased by 11.05% (from 1262 ppm to 1401 ppm), whereas turbidity and Zn levels fell by 98.17% (from 54 to 1 NTU) and 98.38% (from 9.8 ppm to 0.16 ppm), respectively. These results underline the suitability of this composition for effectively treating increasing volumes of electroplating waste.