English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 49378/84106 (59%)
造訪人次 : 7378072      線上人數 : 69
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44714

    題名: Concentration and purification of chromate from electroplating wastewater by two-stage electrodialysis processes
    作者: Chen, Shiao-shing;Li, Chi-wang;Hsu, Hong-der;Lee, Po-ching;Chang, Yu-min;Yang, Chia-hao
    貢獻者: 淡江大學水資源與環境工程學系
    關鍵詞: Chromate;Concentration;Purification;Two-stage electrodialysis;Electroplating wastewater
    日期: 2009-01
    上傳時間: 2010-08-10 11:24:34 (UTC+8)
    出版者: Elsevier BV
    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.
    關聯: Journal of Hazardous Materials 161(2-3), pp.1075-1080
    DOI: 10.1016/j.jhazmat.2008.04.106
    顯示於類別:[水資源及環境工程學系暨研究所] 期刊論文


    檔案 大小格式瀏覽次數
    0304-3894_161(2-3)p1075-1080.pdf546KbAdobe PDF408檢視/開啟



    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋