Through continuous flow experimentation, the reactivity characteristics of zero-valent iron （Fe0）-PRB with ground watercontaminated by nitrate, chromium and the combination of nitrate and chromium were investigated....Through continuous flow experimentation, the reactivity characteristics of zero-valent iron （Fe0）-PRB with ground watercontaminated by nitrate, chromium and the combination of nitrate and chromium were investigated. The results showed thatnitrate could be effectively deoxidized by zero-valent iron. NO^2- -N was the transitional deoxidization product, while NH4＋-Nwas the main final product in the effluent. Chromium could be deoxidized by zero-valent iron more effectively for the chromiumcontaminated ground water which was treated by PRB. The redox products such as Fe3＋ and Cr（III） precipitated on the packingmedia during the process. For the treatment of ground water contaminated by both nitrate and chromium, the results showed thatthe Cr（VI） removal efficiency by the zero-valent iron was not affected by the co-existence of NO^3- -N, while the NO^3- -N removalefficiency decreased with the existence of Cr（VI）.展开更多
Organic contamination of groundwater is a major concern in China.However,remediation technology for groundwater contamination to address the potential harm and danger brought by the abovementioned serious issue is sti...Organic contamination of groundwater is a major concern in China.However,remediation technology for groundwater contamination to address the potential harm and danger brought by the abovementioned serious issue is still in the research stage.This study aims to improve the current research findings.In the research project,drilling,soil,and groundwater sampling and analysis were conducted in a contamination site of a petrochemical plant,migration of contaminants to the river was predicted using a numerical model,the sequence permeable reactive barrier(PRB)for treating nitrobenzene(NB)and benzene was proposed,and simulation was carried out.Research findings demonstrated that three leaking locations had been identified in the plant,the major pollutants were NB and benzene,and the groundwater contamination area was around 640000 m2.Computation results of the numerical model indicated that,in the worst case,the groundwater plume would reach the river after migration for nearly 9 years,which would endanger the safety of surface water supply.Furthermore,the twoPRB system with the filling of zero-valent iron(ZVI)and granular activated carbon attached with biofilm exerted strong remediation effects.Experimental results indicated that ZVI could transform NB to aniline effectively with a rate of approximately 93%.Meanwhile,aniline,benzene,and other organic pollutants could easily be biodegraded.展开更多
文摘Through continuous flow experimentation, the reactivity characteristics of zero-valent iron （Fe0）-PRB with ground watercontaminated by nitrate, chromium and the combination of nitrate and chromium were investigated. The results showed thatnitrate could be effectively deoxidized by zero-valent iron. NO^2- -N was the transitional deoxidization product, while NH4＋-Nwas the main final product in the effluent. Chromium could be deoxidized by zero-valent iron more effectively for the chromiumcontaminated ground water which was treated by PRB. The redox products such as Fe3＋ and Cr（III） precipitated on the packingmedia during the process. For the treatment of ground water contaminated by both nitrate and chromium, the results showed thatthe Cr（VI） removal efficiency by the zero-valent iron was not affected by the co-existence of NO^3- -N, while the NO^3- -N removalefficiency decreased with the existence of Cr（VI）.
基金the Key Project of National Natural Science Foundation of China(Grant No.41530636)the State-Local Joint Engineering Laboratory for Control and Remediation Technologies of Petrochemical Contaminated Site.
文摘Organic contamination of groundwater is a major concern in China.However,remediation technology for groundwater contamination to address the potential harm and danger brought by the abovementioned serious issue is still in the research stage.This study aims to improve the current research findings.In the research project,drilling,soil,and groundwater sampling and analysis were conducted in a contamination site of a petrochemical plant,migration of contaminants to the river was predicted using a numerical model,the sequence permeable reactive barrier(PRB)for treating nitrobenzene(NB)and benzene was proposed,and simulation was carried out.Research findings demonstrated that three leaking locations had been identified in the plant,the major pollutants were NB and benzene,and the groundwater contamination area was around 640000 m2.Computation results of the numerical model indicated that,in the worst case,the groundwater plume would reach the river after migration for nearly 9 years,which would endanger the safety of surface water supply.Furthermore,the twoPRB system with the filling of zero-valent iron(ZVI)and granular activated carbon attached with biofilm exerted strong remediation effects.Experimental results indicated that ZVI could transform NB to aniline effectively with a rate of approximately 93%.Meanwhile,aniline,benzene,and other organic pollutants could easily be biodegraded.
