教師資料查詢 | 類別: 期刊論文 | 教師: 李柏青 PO-CHING LEE (瀏覽個人網頁)

標題:Concentration and purification of chromate from electroplating wastewater by two-stage electrodialysis processes
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
語言英文
ISSN0304-3894;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
國別荷蘭
公開徵稿
出版型式紙本;電子版
相關連結
Google+ 推薦功能,讓全世界都能看到您的推薦!