Abstract:
From the study of wastewater management of the dial-plate electroplating factory with production rate about 45,000 plates per month, it was found that wastewater flow rate from nickel, zinc, silver, 3 gold and rhodium electroplating processes was around 10 m per day. The wastewater characteristic was acidic and had the concentrations of zinc, nickel and cyanide about 75, I00 and 16 mg/L, respectively. In addition, the concentration of silver was very low. Also, the wastewater that contair.ed gold and rhodium was not discharged because of their recovery. After a preliminary economic evaluation using the Present Worth (PW) method on approaches of wastewater management based on the fiture factory plan with increasing 3 times of a present production rate, it was found that the approach of constructing the batch wastewater treatment within the factory was more feasible than the approach of hiring a company that got the permission to manage this wastewater outside the factory. However, a further consideration in details before the construction needs to be investigated.