Orthogonal Experimental Study on Remediation of Ethylbenzene Contaminated Soil by SVE

Shuangxia Zhang, Zhixiang Liu, Ruhua Sun, Weijun Liu and Yongjun Chen ()
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Shuangxia Zhang: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Zhixiang Liu: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Ruhua Sun: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221000, China
Weijun Liu: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Yongjun Chen: School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Sustainability, 2023, vol. 15, issue 2, 1-17

Abstract: Soil vapor extraction (SVE) technology has strong potential value in the decontamination of soils dominated by volatile contaminants. In this paper, in order to evaluate in detail the influence of the main factors on the efficiency of SVE, L 9 (3 4 ) orthogonal tests and response surface analysis were carried out using a self-developed one-dimensional SVE system model. A first-order kinetic reaction model was also employed to analyze the relationship between pollutant concentration and time. The thermal reaction unit of SVE technology with a scale consistent with the soil column of the indoor test was simulated using COMSOL simulation software. The obtained results indicate that the most important factors affecting the performance of SVE are time, temperature, and contaminant concentration, while the influence of the extraction flow rate is not significant. A first-order kinetic reaction model can be used to predict the half-life of contaminant concentrations. Combined with the desirability function, the optimal conditions for the removal of ethylbenzene from soil were: time 180 min, temperature 20 °C, extraction flow 6000 mL/min, and contaminant concentration 2%. The developed numerical model, 3D-SVE, nicely simulates laboratory findings. These results can provide ideas to improve the efficiency of SVE.

Keywords: soil vapor extraction; orthogonal test method; first-order kinetic reaction model; variance analysis; response surface method; 3D numerical model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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