運用電導度控制鍍金程序逆洗節水之研究; Conductivity Control for Reverse Washing Process In Gold-plating

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题名:	運用電導度控制鍍金程序逆洗節水之研究;Conductivity Control for Reverse Washing Process In Gold-plating
作者:	楊昀哲;Yun-Che Yang
贡献者:	環境工程研究所碩士在職專班
关键词:	電導度控制;逆洗節水管理;Conductivity Control;Gold-plating
日期:	2011-06-17
上传时间:	2012-01-05 12:32:29 (UTC+8)
摘要:	近年來，由於產業的蓬勃發展，使得電鍍製品的需求大幅增加。然而，電鍍製程需要大量的清水清洗，清洗後需將廢水處理後才能排放，如何降低製程廢水排放，並維持優良產品品質，為一極大的挑戰。本論文研究改良之逆洗方式及電導度閾值之建立，進行節水研究，並探討節省之成本。研究方式透過將原先水洗槽改為逆洗槽方式進行，加上電導度監測，並隨時對產品進行可靠度測試，分析其品質，藉以找出最佳節水控制之電導度閾值。研究結果發現，將傳統清洗方式改為逆洗，單一產線每月可降低用水量約為56978L，用水量大幅降低83%。以電導度為節水控制參數，測試結果得知電解脫脂、酸活化、鍍鎳、鍍金用水之電導度閾值分別為1865, 850, 132, 233 μs/cm。經由費用分析可知導入此節水製程，工廠單月可有效節省生產費用約38.1萬元。因此電鍍製程採用逆洗節水技術，可有效減少製程廢水量，降低廢水處理成本及達到環境保護的目標。 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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