Yue Luo, Wenchao Huang, Fujian Xu, Xinfeng Zhang, Shentao Yang, Jin Luo
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引用次数: 0
Abstract
Purpose
Most forms of Mercury (Hg) in soil have significant destructive effect on ecosystems and food safety because of enormous toxicity. The existing treatment methods have drawbacks such as high energy consumption, complex operation, long remediation cycle, and secondary pollution. Therefore, this study aims to develop a governance method with low energy consumption, simple operation, short execution cycle, and no secondary pollution.
Methods
A new system was set up to remove leachable Hg2+ from soil and its performance was evaluated. The system consisted of photochemical vapor generator (PVG, for Hg2+ removal), dielectric barrier discharge (DBD) trapping reactor (for collection of removed Hg0). In the presence of organic acids, leachable Hg2+ was converted to gaseous Hg0 by UV irradiation in the PVG, and transported to the DBD trap by air for collection of the removed Hg2+. Soil samples in PVG were taken into glass tubes at specific time and then added aqua regia, analyzed using ICP-MS after digested in a boiling water bath. The performance of DBD trap was analyzed by connecting with ICP-MS.
Results
This study achieved the removal of leachable Hg2+ from soil under the UV excitation, the subsequent conversion of escaped gaseous Hg0 to solid and enrichment in DBD trap. The factors affecting the efficiencies of photochemical reaction, transport and collection were carefully investigated. Under the optimized conditions, the removal efficiency of 2.00 mg L−1 leachable Hg2+ in soil reached 95.0% within 1 h. Even in the presence of 15 interfering ions separately containing 50 mg L−1, good remediation effects can still be achieved. The capture rate of gaseous Hg0 by DBD trap is close to 100%. The system can achieve Hg pollution control in 10 types of soil, demonstrating great promotion value.
Conclusions
This system utilizes PVG theory and DBD low-temperature plasma device to construct a safe, green, simple, and inexpensive method for removing leachable Hg2+ from soil.
期刊介绍：
The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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