淋土式介质阻挡放电等离子体修复阿特拉津污染土壤  

REMEDIATION OF ATRAZINE CONTAMINATED SOIL BY DIELECTRIC BARRIER DISCHARGE PLASMA WITH SOIL SPRINKLE MODE

作　　者：于政 李杰[2] 姜楠[2] 刘政妍 彭邦发 吴彦[2] YU Zheng;LI Jie;JIANG Nan;LIU Zheng-yan;PENG Bang-fa;WU Yan(School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China;Faculty of Electronic Information and Electrical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学环境学院,大连116024 [2]大连理工大学电气工程学院,大连116024

出　　处：《环境工程》2021年第12期212-219,共8页Environmental Engineering

基　　金：中央高校基本科研业务费资助(DUT20ZD202)。

摘　　要：介绍了淋土式介质阻挡放电等离子体修复阿特拉津污染土壤的方法,探究了土壤特性及等离子体发生参数对阿特拉津降解效果的影响并对中间产物进行检测与分析。结果表明:增加电压和频率有利于提高阿特拉津降解率,降低能量效率;增加初始浓度会导致降解率下降,能量效率上升;而增加土壤粒径或降低pH则导致降解率和能量效率下降;含水率增加使得降解率和能量效率先增后减。在峰-峰值36 kV,电源频率为200 Hz, pH=7.03条件下,60~80目的10 mg/kg阿特拉津污染干土经过50 s放电后阿特拉津降解率为70.95%,能量效率为0.014 mg/kJ。利用液相色谱质谱联用对中间产物进行测定,发现产物主要为脱烷基、脱氯和酮或醛等类阿特拉津产物,未检测到低聚物的生成。由于低温等离子体在土壤颗粒周围产生,使得臭氧和·OH等短寿命活性物种共同参与污染物降解过程,使得反应器降解效果得到增强。A method that the pouring soil into the plasma of dielectric barrier discharge(DBD) to efficiently degrade atrazine in the soil was studied. The effects of soil characteristics and plasma generation parameters on atrazine degradation were investigated and the degradation intermediates were detected and analyzed. The experiment results showed that increasing voltage and frequency could improve the degradation efficiency of atrazine and reduce the energy efficiency. The increase of initial concentration would lead to the decrease of degradation efficiency and the increase of energy efficiency. The degradation efficiency and energy efficiency were decreased when soil particle size increased or pH decreased. As water content increased, degradation efficiency and energy efficiency first increased and then decreased. Under the conditions of peak-peak 36 kV, 200 Hz, and pH of 7.03, the degradation efficiency and energy efficiency of 10 mg/kg polluted dry soil with particle size of 60~80 were 70.95% and 0.014 mg/kJ after discharge treatment for 50 s. Through liquid chromatography-mass spectrometry, the intermediate products were tested to be atrazine-like substances such as dealkylation, dechlorination and ketone or aldehyde without any oligomer. As non-thermal plasma was generated around the soil particles, ozone and the short-lived active species, such as ·OH, jointly participated in the pollutant degradation process, resulting in enhanced reactor degradation effect.

关 键 词：低温等离子体 介质阻挡放电 土壤修复 淋土式 阿特拉津 

分 类 号：X592[环境科学与工程—环境工程] X53