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Application of electrodialysis in reuse of salt in membrane concentrate of printing and dyeing wastewater

Authors： WANG Yan, WANG Qiliang, XU Yinong, LIU Rui, JIN Tieying, GUO Ziyang, CHANG Na，Wang Haitao

Units： 1School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China; 2ZhejiangJinmo Environmental Technology Co.,Ltd, Zhejiang 312000, China; 3School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China

KeyWords： electrodialysis; membrane; ion exchange; textile wastewater; recovery; process

ClassificationCode：X703.1

year,volume(issue):pagination： 2022,42(3):122-128

Abstract：

The effects of electrodialysis pretreatment, operating conditions and post-treatment on salt concentration and dyeing effect were investigated in the concentrated solution of printing and dyeing wastewater membrane. The salt reuse process of chelating resin + roll-type ultrafiltration + electrodialysis + acid-base neutralization and alkali removal was explored. The results show that the hardness removal rate of the concentrated solution of printing and dyeing wastewater by chelating resin is 89.5%, the chromaticity and COD removal rates by rolling ultrafiltration are 81.2% and 65.9%, respectively. The electrical conductivity of electrodialysis concentrated water is 105.60 mS·cm-1 after concentration, and that of electrodialysis concentrated water after alkali removal is 114.21 mS·cm-1. The alkalinity is 1515 mg·L-1, and the concentrated brine can be directly reused after alkali removal.

Funds：

国家重点研发计划“高新区印染废水近零排放及资源化利用技术研究及示范”（2019YEC0408400）

AuthorIntro：

王岩（1997-），男，河南商丘人，在读研究生，主要从事工业废水深度处理与回用研究

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