| Summary: | 碩士 === 國立中央大學 === 環境工程研究所碩士在職專班 === 99 === Abstract
With increasing demands on electronics and high quality of product outlooks, electroplating industry is facing requirements in large quantity and fine quality. The plating process requires a lot of water washing so that the surface is clean enough for the deposition of metal; as the consequence, large amount of wastewater is generated. The reduction of wastewater and maintain high quality of electroplating is always a great challenge. This objective of this study is to reduce the water usage in washing process by modifying the washing process and to setup conductivity threshold. The amount of water and the costs of water and wastewater treatment were analyzed. The counter-current washing process was employed in the modification of washing process. The conductivity threshold was determined by examining the product quality every now and then. It was found that the water usage was reduced to 17%. The conductivity thresholds also decreased as the electroplating processes proceeded, which are 1865, 850, 132, 233 μs/cm for electrolytic skim, acid activation, nickel plating, gold plating, respectively. This may be because that the product was very cleaned after several washes at the previous electroplating steps. After considering both cost of potable water, deionized water treatment, and wastewater treatment, cost analysis showed that about 381 thousands NT dollars could be saved monthly. The results showed that counter-current washing process could effectively reduce the water usage and operation cost; hence, the goals of water reservation and environmental protection could be achieved
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