Treatability studies of naphthalene in soil,water and air with persulfate activated by iron(Ⅱ)  

作　　者：Gabriela P.Mendes Vivian M.A.Magalhaes Lélia C·R·Soares Rayanne M.Aranha Claudio A.O.Nascimento Marilda M.G.R.Vianna Osvaldo Chiavone-Filho 

机构地区：[1]Department of Chemical Engineering,University of Sao Paulo,SPf 05508-000,Brazil [2]Department of Chemical Engineering,Federal University of Rio Grande Do Norte,Natal,RN,59072-970,Brazil

出　　处：《Journal of Environmental Sciences》2020年第4期67-77,共11页环境科学学报（英文版）

基　　金：the National Council for Scientific and Technological Development(CNPq);the Coordination for the Improvement of Higher Education Personnel(CAPES-Project PROCAD-CAPES No.88881.068433/2014-01)for the financial support

摘　　要：Chemical oxidation was applied to an artificially contaminated soil with naphthalene(NAP).Evaluation of NAP distribution and mass reduction in soil,water and air phases was carried out through mass balance.Evaluation of NAP distribution and mass reduction in soil,water and air phases was carried out through mass balance.The importance of the air phase analysis was emphasized by demonstrating how NAP behaves in a sealed system over a 4 hr reaction period.Design of Experiments method was applied to the following variables:sodium persulfate concentration[SP],ferrous sulfate concentration[FeS04],and pH.The system operated with a prefixed solid to liquid ratio of 1:2.The following conditions resulted in optimum NAP removal[SP]=18.37 g/L,[FeSO4]=4.25 g/L and pH=3.00.At the end of the 4 hr reaction,62%of NAP was degraded.In the soil phase,the chemical oxidation reduced the NAP concentration thus achieving levels which comply with Brazilian and USA environmental legislations.Besides the NAP partitioning view,the monitoring of each phase allowed the variabilities assessment over the process,refining the knowledge of mass reduction.Based on NAP distribution in the system,this study demonstrates the importance of evaluating the presence of semi-volatile and volatile organic compounds in the air phase during remediation,so that there is greater control of the system as to the distribution and presence of the contaminant in the environment.The results highlight the importance of treating the contaminant in all its phases at the contaminated site.

关 键 词：Chemical oxidation Phase distribution Degradation kinetics PAH Soil remediation Mass balance 

分 类 号：X50[环境科学与工程—环境工程]