Yin Wang, Jiao Zhao, Xiaojia Tang, Tie Li, Yang Liu, Yimin Zhu
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Efficient adsorption, encapsulation and stabilization of MgO in the remediation of low-concentration petroleum contaminated soil.
Petroleum contaminated soil (PCS) has complex properties and compositions, which seriously endangers the environment and is difficult to treat. In this study, a new method for the remediation of PCS using MgO as remediation agent was proposed. Meanwhile, the mechanism of PCS remediation was revealed by various characterization methods. The study found that MgO was effective in remediating PCS. The results of PCS remediation showed that the residual oil rate of PCS decreased from 2.62 to 1.37%, and the absolute removal rate of oil in PCS after remediation was 37.3% under the optimum remediation conditions. The mechanism research indicated that the prepared MgO had large specific surface area, high hydration activity and strong adsorption with the conditions of calcination temperature of 650°C, calcination time of 120 min and heating rate of 10°C/min. In the remediation process of PCS, MgO was tightly adsorbed on the surface of PCS particles, and the hydration reaction occurred rapidly after contact with water to form Mg(OH)2. Mg(OH)2 could effectively encapsulate soil particles firmly, ensuring the stability of PCS, thereby achieving the effective remediation of PCS. This study provided a new method for the remediation of low-concentration PCS, and had important scientific significance for the future research on the advanced treatment of low-concentration PCS.
期刊介绍：
Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people.
Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes.
The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.
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