期刊論文
| 學年 | 97 |
|---|---|
| 學期 | 1 |
| 出版（發表）日期 | 2009-01-01 |
| 作品名稱 | Concentration and purification of chromate from electroplating wastewater by two-stage electrodialysis processes |
| 作品名稱（其他語言） | |
| 著者 | Chen, Shiao-shing; Li, Chi-wang; Hsu, Hong-der; Lee, Po-ching; Chang, Yu-min; Yang, Chia-hao |
| 單位 | 淡江大學水資源與環境工程學系 |
| 出版者 | Elsevier BV |
| 著錄名稱、卷期、頁數 | Journal of Hazardous Materials 161(2-3), pp.1075-1080 |
| 摘要 | A designed two-stage electrodialysis system is proposed to concentrate and purify chromate from a low pH electroplating wastewater using monovalent selective electrodialysis membranes. With low pH of the raw water (pH 2.2) in the first stage, chromate was presented as HCrO4− and monovalent ions (HCrO4−, NH2SO3−, Na+ and Cl−) were able to pass through the membrane thus chromate was concentrated up to 191%. Higher current density, flowrate and more membrane area all increased the chromium recovery. When pH was adjusted to 8.5 before entering the second stage, the chromate species was presented as divalent CrO42− and retained in the concentrated stream, and the rest monovalent ions (NH2SO3−, Na+ and Cl−) were separated by passing through the membrane. For example, 45% of the chlorides were separated in this study. The separation efficiencies in the second stage were also increased when the current density, flowrate and membrane area were increased. Electron Spectroscopy for Chemical Analysis was used to examine the surface chromate species for stage 1, and anion exchange membrane showed more chromate fouling comparing to cation exchange membrane due to more adsorption and concentration polarization effects for the anion exchange membrane. |
| 關鍵字 | Chromate; Concentration; Purification; Two-stage electrodialysis; Electroplating wastewater |
| 語言 | en |
| ISSN | 0304-3894 1873-3336 |
| 期刊性質 | 國外 |
| 收錄於 | SCI EI |
| 產學合作 | |
| 通訊作者 | Li, Chi-wang |
| 審稿制度 | |
| 國別 | NLD |
| 公開徵稿 | |
| 出版型式 | 紙本 電子版 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44714 ) |