Study on practical problems of electroplating industry-1. Recovery and reuse of chromium wastewater-2. Dye quality control of anodizing factory

• Main Authors: You-Wei Jhang, 鄭又維
• Other Authors: Jih-Hsing Chang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/23565525651319313340

碩士 === 朝陽科技大學 === 環境工程與管理系 === 104 === The electroplating industry is one of the most important economic developments in Taiwan. Many living products have been relied on these manufacturing processes. However, the abundant wastewater will be produced by the electroplating industry, which results in strong environmental impact. This study focuses on establishing techniques for solving practical manufacturing problems of electroplating industry including 1. recovery and reuse of chromium wastewater, 2. dye quality control of anodizing factory. The oil and organic materials were removed from the chromium wastewater by the activated carbons and concentration process. Then, the proper constituents of this wastewater were adjusted and verified by the Hull cell test. Results indicate that the recovered chromium solution can meet the electroplating criteria. In order to establish a stable dying process for reducing the risk of color variation, 2 kinds of dyes were detected by UV light to find their appropriate wavelength that was 600.0 nm and 620.0 nm, respectively. After building the linear relation between the dye concentration and absorbance and comparing the dye standard concentration, we find the proper operational concentration of the above dyes as 3.5 g/L and 7.5 g/L, respectively. In addition, we find the concentration of sulfuric acid, phosphoric acid, sulfuric copper, and nitrate is 2.1 %, 68.6 %, 4.7 %, and 24.66 %, respectively, by Gravimetric analysis.