Fluoride Removal from Brackish Groundwaters by Constant Current Capacitive Deionization (CDI)

被引：85

作者：

Tang, Wangwang ^{[1
]}

Kovalsky, Peter ^{[1
]}

Cao, Baichuan ^{[2
]}

He, Di ^{[1
]}

Waite, T. David ^{[1
]}

机构：

[1] Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia

[2] Beijing Jiaotong Univ, Sch Civil Engn, Dept Municipal & Environm Engn, Beijing 100044, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2016年 / 50卷 / 19期

基金：

澳大利亚研究理事会;

关键词：

CARBON ELECTRODES; POROUS-ELECTRODES; ADSORPTION; IONS; DESALINATION; WATER; ELECTROSORPTION; PERFORMANCE; SELECTIVITY; CHARGE;

D O I：

10.1021/acs.est.6b03307

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Charging capacitive deionization (CDI) at constant voltage (CV) produces an effluent stream in which ion concentrations vary with time. Compared to CV, charging CDI at constant current (CC) has several advantage, particularly a stable and adjustable effluent ion concentration. In this work, the feasibility of removing fluoride from brackish groundwaters by single-pass constant-current (SPCC) CDI in both zero-volt and reverse-current desorption modes was investigated and a model developed to describe the selective electrosorption of fluoride and chloride. It was found that chloride is preferentially removed from the bulk solution during charging. Both experimental and theoretical results are presented showing effects of operating parameters, including adsorption/desorption current, pump flow rate and fluoride/chloride feed concentrations, on the effluent fluoride concentration, average fluoride adsorption rate and water recovery. Effects of design parameters are also discussed using the validated model. Finally, we describe a possible CDI assembly in which, under appropriate conditions, fluoride water quality targets can be met. The model developed here adequately describes the experimental results obtained and shows how change in the selected system design and operating conditions may impact treated water quality.

引用

页码：10570 / 10579

页数：10

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