预处理方式对氧化-还原联合技术修复硝基苯污染地下水的影响  被引量:5

Influence of Pre-Treatment on Remediation of Nitrobenzene Contaminated Groundwater by Combined Oxidation-Reduction Techniques

在线阅读下载全文

作  者:夏甫 杨昱[1] 万朔阳 郜普闯 韩旭 姜永海[1] 徐祥健 XIA Fu;YANG Yu;WAN Shuoyang;GAO Puchuang;HAN Xu;JIANG Yonghai;XU Xiangjian(State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区:[1]中国环境科学研究院,国家环境保护地下水污染过程模拟与控制重点实验室,北京100012

出  处:《环境科学研究》2020年第9期2001-2010,共10页Research of Environmental Sciences

基  金:国家水体污染控制与治理科技重大专项(No.2018ZX07109-003);中国环境科学研究院中央级公益性科研院所基本科研业务专项(No.JY-41373129)。

摘  要:为了探究氧化与还原预处理对氧化-还原联合技术修复硝基苯污染地下水的影响,选取2,4-DNT(2,4-二硝基甲苯)为研究对象,构建过硫酸盐/铁炭修复技术体系,分别设置2个试验槽,一个试验槽以过硫酸盐作为氧化预处理联合以铁炭作为还原后处理,另一个试验槽以铁炭作为还原预处理联合以过硫酸盐作为氧化后处理,对比研究构建的氧化-还原联合系统中不同氧化与还原预处理方式对2,4-DNT去除机制的影响.结果表明:①过硫酸盐氧化材料填充位置显著影响试验槽pH和ORP(氧化还原电位)的变化,在运行周期5 PV(PV为孔隙体积,1 PV时间约为4 h)内,pH可显著增至11左右,ORP值达到最高.②在运行周期5 PV内,氧化填充层S 2O 82-浓度和还原填充层Fe 2+浓度均显著降低.③在运行周期5 PV内,随运行周期的增加,以过硫酸盐作为氧化预处理联合以铁炭作为还原后处理的协同技术体系对2,4-DNT的去除效果显著降低,以铁炭作为还原预处理联合以过硫酸盐作为氧化后处理的协同技术体系对2,4-DNT的去除率维持在100%.④通过液相-质谱联用技术,识别构建的氧化-还原联合技术体系内2,4-DNT降解的主要中间产物,同时结合铁炭微电解还原机制和过硫酸盐氧化机制提出了2,4-DNT协同处理机制及其可能的降解路径.研究显示,还原预处理更有利于氧化-还原联合技术对地下水中2,4-DNT的去除,可为有效处理硝基苯化合物污染地下水提供理论支撑.In order to investigate the effects of the oxidation and reduction pre-treatment on the combined oxidation-reduction techniques in the remediation of nitrobenzene contaminated groundwater,2,4-dinitrotoluene(2,4-DNT)was chosen as the target contaminant and the persulfate-iron-carbon remediation technology system was constructed.Specifically,a large experimental trough of persulfate as oxidation pre-treatment combined with subsequent reduction post-treatment of iron-carbon mixture material and iron-carbon mixture material as reduction pre-treatment combined with subsequent oxidation post-treatment treatment of persulfate were set up.The effects of oxidation and reduction pre-treatment on 2,4-DNT removal mechanism in the combined oxidation-reduction system were compared and studied.The results showed the filling position of persulfate material significantly affected the changes of pH and oxidation-reduction potential(ORP)in the large experimental trough.The pH could be significantly increased to about 11,and the ORP value reached the highest in the 5 pore volume(PV).Within 5 PV,the concentration of persulfate in the oxidized packed layer and the concentration of Fe 2+in the reduced packed layer decreased significantly.Within 5 PV,the removal efficiency of 2,4-DNT in the large experimental trough of persulfate as oxidation pre-treatment combined with subsequent reduction post-treatment of iron-carbon mixture material was significantly reduced,whereas that in the large experimental trough of iron-carbon mixture material as reduction pre-treatment combined with subsequent oxidation post-treatment treatment of persulfate was maintained at 100%.The main intermediates of 2,4-DNT degradation in the combined oxidation-reduction techniques system were identified by liquid chromatograph mass spectrometer(LC-MS).In combination with the iron-carbon micro-electrolysis reduction mechanism and persulfate oxidation mechanism,the collaborative treatment mechanism and possible degradation paths were proposed.Our results showed that t

关 键 词:氧化预处理 还原预处理 2 4-二硝基甲苯 中间产物 降解机制 

分 类 号:X523[环境科学与工程—环境工程]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象