Probability of TDS reduction in effluent from electronic industry using adsorption, coagulation-flocculation, photocatalytic, and ion exchange processes

Abstract

This research aimed to determine the probability of TDS reduction in effluent from electronic industry prior to intake to reverse osmosis via 4 treatment processes. 1) In adsorption process, pH was varied at 5, 6 and 7. At each pH, dose of granular activated carbon of 1 g/ 50 ml effluent with 100 rpm shaking for 0.5, 1, 1.5, 6, 24 and 48 hours were investigated. 2) In coagulation-flocculation process, pH was varied at 5, 6, 7, 8 and 9. One ml per 150 ml effluent was added, followed by 0.1 ml of coagulant aid. 3) In photocatalytic process, pH was varied at 5, 6, 7 and 8. One ml per L of photocatalyst (TiO₂) was added with UV lamp (7 watts) for an hour. 4) In ion exchange process, two systems i.e., batch and column were approached. Dose of mixed resin used in batch was 1 g/ 50 ml effluent, and 10 g at flow rate 1 ml/min in column for 0.5-4 hours. The results found that adsorption, coagulation-flocculation and photocatalytic processes showed very low TDS removal performance, on the other hand, ion exchange presented satisfactory efficiency. The results found that optimum reduction time for batch system of ion exchange was 0.5 hours with TDS removal efficiency of 25.5% whereas column system performed very high removal efficiency of more than 99.0% from initial to 3 hours of experimental period.