Optimization ratio of industrial waste and sodium persulfate for synergy in solidification/stabilization of petroleum-contaminated soil
SHI Qing-hong1, YANG Xiu-juan1,2, ZHAO Zhi1, FAN Heng-hui1,2, MENG Min-qiang1,2, MA Xing-ye1
1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China; 2. Institute of Geotechnical Engineering/Museum of Problematic Rock and Soil, Northwest A&F University, Yangling 712100, China
Abstract：Sodium persulfate, lime, fly ash, and carbide slag were used as solidification/stabilization agent materials to investigate the influence of different materials content ratios on the unconfined compression strength, toxic leaching concentration, and acid neutralization capacity of petroleum-contaminated soil, which based on the orthogonal test included four influenced factors and four levels. The optimization ratio of solidified/stabilized materials was selected under fuzzy optimization theory frame. The changeable rules of pH value, temperature, S2O82– content and total petroleum hydrocarbon content were analyzed to explain the solidified/stabilized mechanism of petroleum-contaminated soil. The X-ray diffraction test (XRD) and scanning electron microscope (SEM) test were also conducted to illustrate the microscopic mechanism in solidification/stabilization of petroleum-contaminated soil further. The experimental results showed that the sodium persulfate content had the greatest influence on the unconfined compression strength and toxic leaching concentration of petroleum-contaminated soil based on the extremum difference analysis. And the lime content had the greatest influence on acid neutralization capacity of petroleum-contaminated soil. It also showed that the content of sodium persulfate, lime, fly ash, and carbide slag were 0.6%、8.0%、10.0%、6.0%, respectively, can be selected as the optimal ratio to solidify/stabilize the petroleum-contaminated soil according to the fuzzy optimization indexes of unconfined compression strength, toxic leaching concentration, acid neutralization capacity and handing cost. The unconfined compression strength was 630.40kPa. The toxic leaching concentration was 4.44mg/L. The acid neutralization capacity was 385.71cmol/kg. And the handing cost was 136.46yuan/t. The solidified/stabilized petroleum-contaminated soil achieved the requirement of the strength of refuse reclamation and environmental safety. The toxic leaching concentration reduction, and the strength and acid neutralization capacity improved of the solidified/stabilizes petroleum-contaminated soil. The reasons can be explained by the fact that some petroleum can be removed from the contaminated soil because of oxidated reaction between sodium persulfate and petroleum. And the cemented substance was generated to cement the soil particles due to the hydration reaction of lime, fly ash and calcium carbide slag.
石庆红, 杨秀娟, 赵之, 樊恒辉, 孟敏强, 马兴业. 工业废渣-过硫酸钠协同固化/稳定化石油污染土配比优选研究[J]. 中国环境科学, 2023, 43(4): 1791-1801.
SHI Qing-hong, YANG Xiu-juan, ZHAO Zhi, FAN Heng-hui, MENG Min-qiang, MA Xing-ye. Optimization ratio of industrial waste and sodium persulfate for synergy in solidification/stabilization of petroleum-contaminated soil. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1791-1801.
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