摘要
通过对多环芳烃(PAHs)污染土壤的异位热脱附实验,探究了碱基类(Ca(OH)_(2)、CaO、NaOH)、氧化类(过硫酸钠、过氧化苯甲酰、过碳酸钠)和其他类(FeCl_(3)、CuCl_(2)、颗粒活性炭)改性剂对PAHs热脱附效率的提升作用,优选最佳改性剂及配比。3类改性剂的优选结果为2.0%(质量分数,下同)Ca(OH)_(2)、5.0%过氧化苯甲酰和5.0%FeCl_(3)。添加2.0%Ca(OH)_(2)在300℃下脱附10 min、添加5.0%过氧化苯甲酰在200℃下脱附60 min或添加5.0%的FeCl_(3)在150℃下脱附60 min均可使各PAHs组分残留量达到《场地土壤环境风险评价筛选值》(DB11/T 811—2011)的修复标准。添加2.0%Ca(OH)_(2)对土壤PAHs热脱附去除效果最好,300℃下PAHs热脱附去除率最高,可达96.31%,而5.0%过氧化苯甲酰对PAHs热脱附去除率提升更明显。
Through ex-situ thermal desorption experiments on polycyclic aromatic hydrocarbons(PAHs)contaminated soil,the effects of alkali based compounds(Ca(OH)_(2),CaO,NaOH),oxidation compounds(sodium persulfate,benzoyl peroxide,sodium percarbonate)and other type of modifiers(FeCl_(3),CuCl_(2),granular activated carbon)on the thermal desorption efficiency of PAHs were investigated,and the optimal modifier and ratio were selected.The preferred results for the three types of modifiers were 2.0%(mass fraction,the same below)Ca(OH)_(2),5.0%benzoyl peroxide,and 5.0%FeCl_(3)respectively.Adding 2.0%Ca(OH)_(2)to desorb at 300℃for 10 minutes,adding 5.0%benzoyl peroxide to desorb at 200℃for 60 minutes,or adding 5.0%FeCl_(3)to desorb at 150℃for 60 minutes could make the residual amount of each PAHs component met the remediation standards specified in the“Site soil environmental risk assessment screening values”(DB11/T 811-2011).Adding 2.0%Ca(OH)_(2)had the best effect on the thermal desorption and removal of PAHs from soil.At 300℃,the thermal desorption and removal rate of PAHs reached the highest of 96.31%.However,the thermal desorption and removal rate of PAHs was significantly improved by adding 5.0%of benzoyl peroxide.
作者
徐成华
骆文轩
黄涛
常伟
岳修鹏
张亚平
XU Chenghua;LUO Wenxuan;HUANG Tao;CHANG Wei;YUE Xiupeng;ZHANG Yaping(The First Geological Brigade of Jiangsu Geology and Mineral Resources Bureau,Nanjing Jiangsu 210041;Key Laboratory of Thermal Conversion and Control of Ministry of Education,School of Energy and Environment,Southeast University,Nanjing Jiangsu 210096;Jiangsu Zhongcheng Construction Engineering Corporation,Nanjing Jiangsu 210041)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2023年第4期492-498,共7页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.42077126)
江苏省地质工程环境智能监控工程研究中心开放基金资助项目(No.2021-ZNJKJJ-02)。
关键词
多环芳烃
土壤修复
改性剂
热脱附
polycyclic aromatic hydrocarbons
soil remediation
modifer
thermal desorption
