摘要
将被石油烃(C10-C40)污染的地下水作为研究对象,以天然火山渣作为可渗透反应墙(PRB)的填充介质,通过填充柱动态实验,研究了火山渣吸附石油烃(C10-C40)过程中的影响因素。实验结果表明0~1 mm、1~3 mm、3~6 mm、6~9 mm粒径火山渣的渗透系数分别为11.98 m/d, 12.52 m/d, 14.23 m/d及15.72 m/d;3.5 h后,0~1 mm及1~3 mm粒径的火山渣对石油烃(C10-C40)的去除率仍然能达到85%以上;在进水流速为5 mL/min时,1~3 mm粒径的火山渣对石油烃(C10-C40)的去除率仍高于90%以上,计算得到火山渣吸附石油烃(C10-C40)的反应速率常数k=2.37 h-1,污染物停留时间为1.12 h,要使4.3 mg/L石油烃(C10-C40)的浓度降到管控目标0.3 mg/L,最少需要填充火山渣高度为0.086 m,在以上条件运行下,在第一次出水时,去除率达到了94%,达到了污染管控目标值以下,3.5 h后去除率仍在89%左右。为以火山渣作为PRB填充介质修复地下水石油烃(C10-C40)实际工程应用中提供重要技术支撑。
The groundwater polluted by petroleum hydrocarbons(C10-C40) was taken as the research object, and the natural volcanic slag was used as the filling medium of permeable reactive wall(PRB). Through the dynamic experiment of packed column, the influencing factors in the process of the adsorption of petroleum hydrocarbons(C10-C40) by volcanic slag were studied. The experimental results show that the permeability coefficients of 0~1 mm, 1~3 mm, 3~6 mm and 6~9 mm cinders are 11.98 m/d, 12.52 m/d, 14.23 m/d and 15.72 m/d respectively;After 3.5 h, the removal rate of petroleum hydrocarbons(C10-C40) by 0~1 mm and 1~3 mm cinders can still reach more than 85%;When the influent flow rate is 5 mL/min, the removal rate of petroleum hydrocarbons(C10-C40) by volcanic slag with a particle size of 1~3 mm is still higher than 90%. The calculated reaction rate constant k=2.37 h-1for the adsorption of petroleum hydrocarbons(C10-C40) by volcanic slag, and the retention time of pollutants are 1.12 h. In order to reduce the concentration of 4.3 mg/L petroleum hydrocarbons(C10-C40) to the control target 0.3 mg/L, at least 0.086 m volcanic slag should be filled. Under the above conditions, the removal rate reached 94%, which was below the target value of pollution control. After 3.5 hours, the removal rate was still around 89%. It provides important technical support for the practical engineering application of using volcanic slag as PRB filling medium to repair petroleum hydrocarbons(C10-C40) in groundwater.
作者
孙述海
李伟健
孟范金
SUN Shuhai;LI Weijian;MENG Fanjin(Changchun Institute of Technology,Changchun 130021,Jilin,Chin)
出处
《吉林地质》
2022年第3期92-96,共5页
Jilin Geology
基金
吉林省教育厅“十三五”科学技术研究项目(JJKH20191270KJ)
吉林省科学技术厅重点研发项目(20200403027SF)。
关键词
PRB
火山渣
去除率
石油烃
PRB
volcanic slag
removal rate
petroleum hydrocarbons
