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| Experimental Study on the Treatment of Mercury Contained Soil by Thermal Analytical Low Temperature Plasma Based on Cold Atomic Absorption Spectrophotometry |
| FAN Hua1, YAO Gao-yang2, LIU Wei3, XING Zi-hui4, SHI Jin-ming5, GAO Bai1*, CHEN Yang6 |
1. School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China
2. Shanghai Geotechnical Engineering Detecting Center, Shanghai 200436, China
3. Zhongmei Engineering Group Ltd., Nanchang 330001, China
4. China Railway Beijing Bureau Group Co., Beijing 100038, China
5. School of Food Science and Technology, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China
6. Beijing Advanced Sciences and Innovation Centre of Chinese Academy of Sciences, Beijing 101407, China |
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Abstract In this paper, we selected the Wanshan mercury mine soil as the research object, processed and studied by thermal analysis of low temperature plasma, By study of temperature, time, additives and other process parameters on mercury removal rate and treatment after Mercury, we analysed and compared the process on the mercury containing waste residue , exploring its mechanism of action and summarizing the key factors influencing the process exhaust system. The main results were as follows: (1) The main form of mercury in contaminated soil was organic binding state (52.5%). Secondly, the oxide bound state was (32.5%), acid extractable state was (8.13%) and residual state was (6.25%). (2) Under the condition of 500 ℃ and 40 minute, the residual mercury concentration was only 1.44 mg·kg-1. (3) Under the condition of 400 ℃, with the extension of time, the removal rate of total mercury in soil increased gradually, and the pyrolysis process was basically completed within 40 minute. In the 200~1 600 mg·kg-1 interval, the higher the initial oncentration of mercury, the smaller the removal rate of total mercury in soil. (4) The synergistic effect of calcium chloride on the pyrolysis of mercury containing soil was the best, followed by citric acid and sublimation sulfur, and sodium sulfide had a certain inhibitory effect. (5) The pulse voltage was 21.1 kV, and the discharge frequency was 650 Hz, which was the best parameter to match the high voltage pulse power supply with the low temperature plasma reactor. The total mercury removal rate could reach above 89.73%.
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Received: 2017-12-02
Accepted: 2018-04-25
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Corresponding Authors:
GAO Bai
E-mail: gaobai@ecit.cn
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