4.6 Article

Experimental and Modeling Study on Cr(VI) Migration from Slag into Soil and Groundwater

期刊

PROCESSES
卷 10, 期 11, 页码 -

出版社

MDPI
DOI: 10.3390/pr10112235

关键词

Cr(VI); groundwater; migration; model; slag; soil

资金

  1. National Natural Science Foundation of China [51204074]
  2. Pearl River S&T Nova Program of Guangzhou, China [201710010065]
  3. Science and Technology Innovation Guidance Project of Zhaoqing City [2021040302005]

向作者/读者索取更多资源

A migration model for Cr(VI) in the slag-soil-groundwater system was investigated based on column experiments and hydraulic parameters estimation, aiming to predict the effect of control programs for groundwater contamination. The results showed that harmless treatment of Cr(VI) slag significantly improved groundwater quality.
The transport and prediction of hexavalent chromium (Cr(VI)) contamination in slag-soil-groundwater is one with many uncertainties. Based on the column experiments, a migration model for Cr(VI) in the slag-soil-groundwater system was investigated. The hydraulic conductivity (Kt), distribution coefficient (Kd), retardation factor (Rd), and other hydraulic parameters were estimated in a laboratory. Combining these hydraulic parameters with available geological and hydrogeological data for the study area, the groundwater flow and Cr(VI) migration model were developed for assessing groundwater contamination. Subsequently, a Cr(VI) migration model was developed to simulate the transport of Cr(VI) in the slag-soil-groundwater system and predict the effect of three different control programs for groundwater contamination. The results showed that the differences in the measured and predicted groundwater head values were all less than 3 m. The maximum and minimum differences in Cr(VI) between the measured and simulated values were 1.158 and 0.001 mg/L, respectively. Moreover, the harmless treatment of Cr(VI) slag considerably improved the quality of groundwater in the surrounding areas. The results of this study provided a reliable mathematical model for transport process analysis and prediction of Cr(VI) contamination in a slag-soil-groundwater system.

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