Optimization of Electrocoagulation Process for Thallium Removal from Aqueous Solutions by Response Surface Methodology

被引：0

作者：

Fu X. ^{[1
,2
]}

Zhang L. ^{[2
]}

Li L. ^{[2
]}

Yang G. ^{[2
]}

机构：

[1] School of Metallurgy and Environment, Central South University, Changsha

[2] Changsha Research Institute of Mining and Metallurgy Co., Ltd., Changsha

来源：

Xiyou Jinshu/Chinese Journal of Rare Metals | 2020年 / 44卷 / 05期

关键词：

Advance treatment; Aeration; Electrocoagulation; Response surface method; Thallium pollution; Wastewater;

D O I：

10.13373/j.cnki.cjrm.XY20020016

中图分类号：

学科分类号：

摘要：

Thallium (Tl) is a highly toxic rare metal. In recent years, the frequent occurrence of Tl pollution and Tl poisoning has aroused attention to the Tl pollution control. Tl has a strong mobility in the environment. Tl(I) containing wastewater is a primary way to migrate and release Tl to the environment. In this study, aeration electrocoagulation using iron electrode for removal Tl(I) from simulated and real wastewater contaminated with low concentration of Tl(I) (<200 µg•L-1) was investigated. The significant factors on Tl(I) removal efficiency were screened out through exploratory single factor experiments. Afterwards, a response surface methodology (RSM) named Box-Behnken was employed to establish quadratic response surface model, the effect of process parameters such as initial pH, treatment time and current density were optimized on the Tl(I) removal efficiency of simulated wastewater. Tl(I) removal efficiency (99.23%) under optimal conditions (initial pH=10.82, 12 min and 14.61 mA•cm-2) aimed to Tl(I) concentration of effluent less than 2 μg•L-1, was close to the predicted one by RSM model (99.09%). Validation experiments showed that the Tl(I) removal efficiency had no significant difference between the real and simulated wastewater under same process conditions. Energy dispersive spectrum (EDS) showed that Tl element was effectively enriched in the settled sludge. Electrocoagulation was a sustainable treatment technology with high efficiency and minimum sludge generation, which could be used for the advance treatment of low concentration Tl wastewater. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

引用

页码：530 / 539

页数：9

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