Integration of ion exchange and non-dispersive solvent extraction processes for the separation and concentration of Cr(VI) from ground waters

被引:27
作者
Galan, B. [1 ]
Castaneda, D. [1 ]
Ortiz, I. [1 ]
机构
[1] Univ Cantabria, ETSIIyT, Dpto Ingn Quim & Quim Inorgan, E-39005 Santander, Spain
关键词
chromium (VI); membrane; high concentrated; ground water; anion exchange;
D O I
10.1016/j.jhazmat.2007.07.084
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The focus of this work has been the study of simultaneous removal and recovery of Cr(VI) from ground waters with a high concentration of the metal (700 mg/l). The main objectives of water cleaning were the decrease of the Cr(VI) concentration down to the limits indicated by the Spanish regulations for discharge into channel waters (0.5 mg/l) and the recovery of the chromate compounds up to 15 g/l. The integration of two technologies: non-dispersive solvent extraction and anion exchange is presented as an environmental compatible solution. The final hybrid process allows the individual shortcomings of each technology to be overcome and leads to an optimum process configuration. Non-dispersive solvent extraction (NDSX) is used mainly for the concentration of the metal in a back-extraction solution and ion exchange (IE) is used for the depuration of the metal in the ground water down to 0.5 mg/l. The integrated process has been carried out on two different scales: laboratory and pilot plant, with satisfactory results being obtained. (c) 2007 Elsevier B.V All rights reserved.
引用
收藏
页码:795 / 804
页数:10
相关论文
共 27 条
[1]   The phosphine oxides Cyanex 921 and Cyanex 923 as carriers for facilitated transport of chromium (VI)-chloride aqueous solutions [J].
Alguacil, FJ ;
López-Delgado, A ;
Alonso, M ;
Sastre, AM .
CHEMOSPHERE, 2004, 57 (08) :813-819
[2]   Experimental and theoretical analysis of a nondispersive solvent extraction pilot plant for the removal of Cr(VI) from a galvanic process wastewaters [J].
Alonso, AI ;
Galán, B ;
González, M ;
Ortiz, I .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1999, 38 (04) :1666-1675
[3]  
[Anonymous], IND PROCESSES WASTE
[4]   Adsorption and ion exchange of some groundwater anion contaminants in an amine modified coconut coir [J].
Baes, AU ;
Okuda, T ;
Nishijima, W ;
Shoto, E ;
Okada, M .
WATER SCIENCE AND TECHNOLOGY, 1997, 35 (07) :89-95
[6]   Recycling of Cr(VI) by membrane solvent extraction:: Long term performance with the mathematical model [J].
Galan, B. ;
Calzada, M. ;
Ortiz, I. .
CHEMICAL ENGINEERING JOURNAL, 2006, 124 (1-3) :71-79
[7]   Removal and recovery of Cr(VI) from polluted ground waters:: A comparative study of ion-exchange technologies [J].
Galán, B ;
Castañeda, D ;
Ortiz, I .
WATER RESEARCH, 2005, 39 (18) :4317-4324
[8]  
GALAN B, 2006, ION EXCHANGE, V24, P621
[9]   Removal of Cr(VI) from aqueous solution by two Lewatit-anion exchange resins [J].
Gode, F ;
Pehlivan, E .
JOURNAL OF HAZARDOUS MATERIALS, 2005, 119 (1-3) :175-182
[10]   Steady-state mass transfer and modelling in hollow fibre liquid membranes [J].
Harrington, PJ ;
Stevens, GW .
JOURNAL OF MEMBRANE SCIENCE, 2001, 192 (1-2) :83-98