Metal Finishing Guide Book


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$12,927 Table 1. Annual electricity savings. Cost per kWh is $.083 (blended cost) 154,679 Total Electricity Saved: $3,114 RO/DI System Cost ($/year) $16,041 192,196 37,517 Table 2 is a summary of the costs and operating expenses associated with the original system of water treatment using electro-precipitation and the operating costs associated with the RO/DI system. As shown, the main operating expense of the new RO/DI system is the cost of regenerating the DI columns, estimated at $12,000/year since the system has been running since April 2011. This new expense is offset by the reduced electrical use both in pump motors and in compressed air RO/DI Water Treatment System to Replace Electro-Precipitation CONCLUSIONS Total Electricity Consumption by Electro-Precipitation Although the RO pump is relatively large compared to the other motors (5 HP), it is utilized approximately 50% of the time compared to the old system's large pump (5.8 HP), which ran continuously. kWh/year • (7) 1/4 HP Rinse Tank Water Recirculation Pumps (small tanks) • (1) 1/2 HP Rinse Tank Water Recirculation Pump (Chrome) • (1) 1 HP Cleaning Tank Recirculation Pump • (1) 5 HP RO Pump Electricity Costs: Original Water Treatment System Compared to New RO-DI System of the scrubber, the tanks no longer had problems. The electricity utilization of the new system is almost an 80% reduction compared to the old system, primarily due to the elimination of compressed air and the overall reduction in pump sizes. Table 1 summarizes the electricity use of the old electroprecipitation system compared to the new system. The RO/DI treatment process has the following electricity consuming components which run only during plating line operation (24 hours, 6 days/week): 677

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