Influence of Thermal Desorption Technology on Removal Effects and Properties of PAH-Contaminated Soil Based on Engineering Experiments

Author:

Zhang Xin12,Li Lei3,Shi Xiaokai4,Chen Shengquan5,Liang Wen6,Zhu Yuen78,Li Hua78

Affiliation:

1. College of Urban and Rural Construction, Shanxi Agricultural University, Jinzhong 030801, China

2. Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China

3. Shanxi Jingdi Ecological Science and Technology Co., Ltd., Taiyuan 030006, China

4. Shanxi Dadi Minji Ecological Environment Co., Ltd., Taiyuan 030006, China

5. Shanxi Geological Group Testing Technology Co., Ltd., Taiyuan 030006, China

6. Department of Ecology and Environment of Yuncheng City, Yuncheng 044000, China

7. School of Environmental & Resource Sciences, Shanxi University, Taiyuan 030006, China

8. Shanxi Yellow River Laboratory, Taiyuan 030006, China

Abstract

Polycyclic aromatic hydrocarbon (PAH) contamination in soil poses a serious threat to ecological safety, human life, and health. Thermal desorption is commonly used to remediate PAH-contaminated soil. Current thermal desorption research primarily focuses on parameters for engineering designs through in-house simulations. In this study, based on a PAH-contaminated site thermal desorption remediation project, the removal efficiency of PAHs in soil (S1, S2) after disposal at different heating temperatures (400, 450, 500, 550 °C) and different residence times (20, 25 min) was investigated, and changes in soil properties before and after disposal were analyzed. The removal rate of 16 PAHs from soil at two concentrations reached 100% after 20 min at 500 °C and 550 °C, respectively. The three-phase structural distances of S1 and S2 soils, respectively, increased by 1.65 and 2.99 times after disposal, sand content increased by 3.20% and 8.27%, water-stable macroaggregates decreased by 8.14% and 2.06%, organic carbon content decreased by 7.27% and 27.05%, heavy fraction organic carbon increased by 33.68% and 5.12%, pH decreased from 10.00 and 10.35 to 8.81 and 8.69, and cation exchange decreased by 13.79% and 26.65%. Soil nutrient content such as TP, AP, TK, and AK increased after thermal desorption, and TN content decreased; approximately 1.0 mg/kg of NO3−-N remained. Our results are expected to support the design of programs for soil reuse after disposal.

Funder

Science and Technology Innovation Program for Higher Education Institutions of Shanxi Province

National Key R&D Program of China

Graduate Education Innovation Program of Shanxi Province

Publisher

MDPI AG

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