《环境科学与工程前沿（英文）》
>> 2016年
第10卷
第2期
doi:
10.1007/s11783-015-0791-0
RESEARCH ARTICLE
Effects of reducing agent and approaching anodes on chromium removal in electrokinetic soil remediation
1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.2. University of Chinese Academy of Sciences, Beijing 100049, China
录用日期：
2015-05-14
发布日期：
2016-02-01
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摘要
A soil remediation method combining in situ reduction of Cr(VI) with approaching anodes electrokinetic (AAs-EK) remediation is proposed. EK experiments were conducted to compare the effect of approaching anodes (AAs) and fixed electrodes (FEs) with and without sodium bisulfite (NaHSO ) as a reducing agent. When NaHSO was added to the soil before EK treatment, 90.3% of the Cr(VI) was reduced to Cr(III). EK experiments showed that the adverse effect of contrasting migration of Cr(III) and Cr(VI) species, which limits the practical application of this technique, was eliminated in the presence of the reducing agent. Furthermore, Tessier fractionation analysis indicated that the reducing agent changed the distribution of the chemical forms of Cr. The AAs-EK method was shown to acidize the soil as the anode moved toward the cathode and this acid front pushed the “focusing” region toward the cathode. After remediation, the pH of the soil was between 1.8 and 5.0 in AAs-EK experiments. The total Cr removal efficiency was 64.4% (except in the “focusing” region) when the reduction reaction was combined with AAs-EK method. We conclude that AAs-EK remediation in the presence of NaHSO is an appropriate method for Cr-contaminated soil.
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