某炼铁厂汞和多环芳烃复合污染土壤热脱附试验研究  

Experimental Study on Thermal Desorption of Mercury and Polycyclic Aromatic Hydrocarbons Composite Contami nated Soil in an Ironmaking Plant

作　　者：舒心 胡培良 李东阳 马英 周虹 沈兆松 Shu Xin;Hu Peiliang;Li Dongyang;Ma Ying;Zhou Hong;Shen Zhaosong(Yonker Environmental Protection Co.,Ltd.,Changsha 410000,China)

机构地区：[1]永清环保股份有限公司,湖南长沙410000

出　　处：《广东化工》2022年第14期90-93,127,共5页Guangdong Chemical Industry

基　　金：国家重点研发计划(No.2018YFC1802700);国家重点研发计划(No.2020YFC1808700);长沙市重点研发计划(No.kh2201433)。

摘　　要：以重庆市某炼铁厂地块复合污染土壤为试样,采用真空管式电阻炉进行热脱附试验,探究复合污染土壤中汞和多环芳烃在不同脱附温度和时间下的脱附效果。结果表明:(1)土壤样品中的汞多以难降解有机质及某些硫化物结合态、残渣态或晶格态等形式存在;(2)汞含量较低初始浓度(10~20 mg/kg)和较高初始浓度(20~40 mg/kg)的土样脱附温度宜分别不低于400℃和450℃;(3)低浓度多环芳烃(超标倍数≤5)、中等浓度多环芳烃(5<超标倍数<50)和高浓度多环芳烃(超标倍数≥50)的试样,脱附温度宜分别设置为400℃、500℃和550℃;(4)对汞和多环芳烃复合污染土壤的脱附温度选择关键取决于多环芳烃;(5)脱附温度相比脱附时间对污染物脱附效果的影响更大。Based on the co-contaminated soil from an ironmaking plant in Chongqing,the thermal desorption test was carried out by vacuum tube resistance furnace device.It explored the desorption effect of mercury and polycyclic aromatic hydrocarbons(PAHs) at different desorption temperatures and time.The results showed that:(1) Mercury in soil samples mostly exists in the form of refractory organic,sulfide bound or residual.(2) The desorption temperature of soil samples with the lower mercury concentration(10~20 mg/kg) and the higher mercury concentration(20~40 mg/kg) should not be less than 400 ℃ and 450 ℃ respectively.(3) For the contaminated soil samples with low concentration of PAHs(exceeding standard multiple),moderate concentration of PAHs(5<exceeding standard<50) and high concentration of PAHs(exceeding standard ≥50),the desorption temperatures should be set to 400 ℃,500 ℃and 550 ℃,respectively.(4) The desorption temperature mainly depended on concentration of PAHs.(5) The effect of desorption temperature on desorption efficiency was greater than that of desorption time.

关 键 词：热脱附 复合污染土壤 汞 多环芳烃 脱附温度 脱附时间 土壤修复 

分 类 号：TQ[化学工程]