超声波强化电动法修复铜污染土壤的室内研究  

Study of electrokinetic remediation on copper-contaminated soil enhanced by ultrasonic

作　　者：郑雪玲[1] 朱琨[1] 孙晋方[1] 蒋煜峰[1] 南忠仁[2] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]兰州大学资源环境学院,兰州730000

出　　处：《安全与环境学报》2010年第2期57-60,共4页Journal of Safety and Environment

基　　金：国家环境保护部公益性项目(NEPCP200809098);国家自然科学基金项目(NSFC40671167)

摘　　要：采用超声波强化电动法对铜污染土壤进行室内修复研究,探讨了超声波强化电动法修复铜污染土壤的可行性,并对其影响机理进行初步探讨。结果表明,超声波可以强化铜污染土壤的电动修复效果,提高Cu^(2+)的迁移和富集效率。在试验开始后连续施加频率为50kHz的超声波3 h时,随着超声波声强的增大,修复效果增强。当声强(以超声波电压表示)达到150 V时,阴极附近的Cu^(2+)富集质量比C/C_0比未施加超声波时提高了43%。土壤含水量对试验结果的影响较大,在超声波作用下,含水量为14%时,土壤的修复效果较好;含水量增加到16%时,修复效果无明显提高。增加超声波辐照时间也可以提高土壤修复效果,但当辐照时间超过5 h后,土壤修复效果无明显增加。研究表明,施加超声波可以强化电动法修复铜污染土壤的效果。This paper presents the experimental study of electrokinetic remediation on copper-contaminated soil under the lab conditions enhanced by ultrasonic energy, in which the feasibility of combined technologies was investigated when the influential reaction mechanisms were primarily ascertained. The experimental results proved that ultrasonic could strengthen the remedial effectiveness by stimulating migration and accumulation of copper ions in the contaminated soil. With the initiative Cu^2＋ concentration of 250 mg/kg in the sandy soil, the ultrasonic with the frequency of 50 kHz was continuously applied into the soil matrix for 3h, then ultrasonic power increased gradually until 150 V. It was evident that the remedial efficiency rose up with the increase of ultrasonic power, and the maximal accumulation mass ratio of Cu^2 ＋ （ C/C0） could increase by 43 % at 150 V in comparison with the electrokinetic remediation without adding ultrasonic energy. Soil water content significantly influenced the experimental result. Under the ultrasonic radiation, the optimal remedial result could be reached at volumetric water content of 14 % . However, the remediation effects would not have any apparent change if volumetric water content was higher than 16%. Although the time of ultrasonic radiation on soil surface positively impacted the remediation results, the efficiency could not obviously be increased if the radiation time was longer than 5 h. The research evidenced that the ap- plication of ultrasonic could enhance the effectiveness of eleetrokinetic remediation on the copper contaminated soil.

关 键 词：环境工程学 土壤污染 电动修复 铜 超声波 土壤含水量 

分 类 号：X53[环境科学与工程—环境工程]