Metal Finishing Guide Book


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720 $12,927 Table 1. Annual electricity savings. Cost per kWh is $.083 (blended cost) RO/DI System 154,679 $3,114 $16,041 192,196 Cost ($/year) kWh/year Total Electricity Saved: 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 37,517 CONCLUSIONS RO/DI Water Treatment System to Replace 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. Total Electricity Consumption by Electro-Precipitation ��� (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 up and caused physical plugging of the DI tanks. After the initial purge 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):

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