SIMULATION OF POLLUTION CHARACTERISTICS AND MIGRATION LAW OF CADMIUM IN SOIL OF A TYPICAL ELECTRONIC WASTE DISMANTLING AREA IN TAIZHOU

LIU Jinhe; ZHENG Yuna; LIU Peng; LIN Kuangfei; HUANG Kai; ZHOU Changrui

doi:10.13205/j.hjgc.202408018

Volume 42 Issue 8

Aug. 2024

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2024 > 42(8): 150-158

LIU Jinhe, ZHENG Yuna, LIU Peng, LIN Kuangfei, HUANG Kai, ZHOU Changrui. SIMULATION OF POLLUTION CHARACTERISTICS AND MIGRATION LAW OF CADMIUM IN SOIL OF A TYPICAL ELECTRONIC WASTE DISMANTLING AREA IN TAIZHOU[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(8): 150-158. doi: 10.13205/j.hjgc.202408018

Citation:

LIU Jinhe, ZHENG Yuna, LIU Peng, LIN Kuangfei, HUANG Kai, ZHOU Changrui. SIMULATION OF POLLUTION CHARACTERISTICS AND MIGRATION LAW OF CADMIUM IN SOIL OF A TYPICAL ELECTRONIC WASTE DISMANTLING AREA IN TAIZHOU[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(8): 150-158. doi: 10.13205/j.hjgc.202408018

Citation:

LIU Jinhe, ZHENG Yuna, LIU Peng, LIN Kuangfei, HUANG Kai, ZHOU Changrui. SIMULATION OF POLLUTION CHARACTERISTICS AND MIGRATION LAW OF CADMIUM IN SOIL OF A TYPICAL ELECTRONIC WASTE DISMANTLING AREA IN TAIZHOU[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(8): 150-158. doi: 10.13205/j.hjgc.202408018

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SIMULATION OF POLLUTION CHARACTERISTICS AND MIGRATION LAW OF CADMIUM IN SOIL OF A TYPICAL ELECTRONIC WASTE DISMANTLING AREA IN TAIZHOU

doi: 10.13205/j.hjgc.202408018

1. Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan 467036, China;
2. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;
3. Shanghai Xin Jinqiao Environmental Protection Company, Shanghai 201201, China

Received Date: 2023-09-09
Available Online: 2024-12-02

Abstract

Abstract

The pollution and migration characteristics of cadmium (Cd) in typical e-waste disposal areas are still unclear. Thus, the electronic waste dismantling area in Taizhou, Zhejiang, was selected as the research area. The vertical pollution and migration characteristics of Cd in soil were studied through pollution investigation, isothermal adsorption experiment, soil column experiment, and HYDRUS-1D software. The migration model of Cd dissolved from accumulated slag under rainfall leaching was established, and its migration in the soil of the study area was predicted. The results showed that Cd pollution in the soil mainly exists in the southwest of the study area, where there has been a history of leachation of e-waste deposits for nearly 30 years, and soil Cd pollution mainly exists in the depth of 0 to 40 cm. The isothermal adsorption of Cd in the vadose zone soil conformed to the Langmuir equation, with K_L and q_m of 0.0373 L/kg and 5465 mg/kg, respectively. The two-site model (TSM model) could well simulate the penetration process of Cd in the soil column (R²=0.998). The migration simulation of the accumulated slag in the actual electronic waste dismantling area using the TSM model showed that the measured and simulated values of Cd concentration in the soil of the study area were consistent (R²=0.970), which further verified the reliability of the model. A further 100-year migration simulation was carried out for the Cd dissolved from the accumulated slag. The results indicated that when the Cd concentration eluted from the accumulated slag was 0.02 mg/L, the Cd concentration in the leaching solution at the bottom of the vadose zone in the 100th year was 0.0042 mg/L, which did not exceed Class Ⅲ water quality standard specified in Groundwater Quality Standard (GB/T 14848—2017), indicating that there was no risk of Cd pollution in groundwater under this scenario, and Cd pollution mainly existed in the vadose zone soil. In conclusion, for the slag leaching scenario in the informal dismantling area in Taizhou, Zhejiang, it was necessary to focus on the risk of Cd contamination in the vadose zone soil. It is recommended to clean up and disassemble the slag in time to avoid receiving rain leaching for a long time. However, for areas where the accumulation time of the slag body is less than 30 years, the surface soil (with a depth of 0~40 cm) should be prioritized in remediation.
- e-waste,
- Cd,
- the two-site model,
- pollution characteristics,
- numerical simulation

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References(43)

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