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《Environmental Protection and Technology》 2017-04
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A study on a pilot-scale remediation employing low-temperature pyrolysis technology for mercury contaminated soil

Yu Zhi;Zhao Ting;Huang Daikuan;Qu Liya;Zhang Junfang;Guizhou Research and Design Institute of Environmental Science;College of Resources and Environmental Engineering,Guizhou University;  
Based on existed experimental results,this study further expands the experiment scale to pilot-scale( processing capacity of about 150kg/h) with the purpose to verify the feasibility for remediating mercury contaminated soil with low-temperature pyrolysis technology under such a condition. The experimental results show that the removal efficiency of mercury from soil reaches 79. 75%as the treating temperature is controlled at 350℃ and the pyrolysis time is set at 30 min. After remediation,changes of soil texture can be observed,with an increase of silt and a decrease of clay,indicating soil changes from clayey loam to sandy loam. The p H,organic matter,total nitrogen,total phosphorus and total potassium are kept almost at the same level as that before remediation,while available phosphorus content is increased by 144. 34%. The available potassium content and cation exchange capacity( CEC) are however decreased by 55. 29% and 36. 05% respectively. The remediated soil can meet farming requirements though some soil nutrients losses are witnessed.
【Key Words】: mercury contaminated soil remediation low-temperature pyrolysis
【Fund】: 国家自然科学基金(41463013);; 贵州省社发攻关项目(黔科合[2016]支撑2804号)
【CateGory Index】: X53
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