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Study On Sorption Of Volatile Organic Contaminants By Natural Soils And Sediments

Posted on:2007-08-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:S H YinFull Text:PDF
GTID:1101360182982675Subject:Environmental Engineering
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The soil (sediment) contamination is gradually serious in the last years. Organicchemicals in soils (sediments) are the first for the category and scope of contaminationand its harm to organism. This paper researches the sorption of the volatile Organicchemicals in soils, especially for TCE and Benzene. The sorption characteristic of soilitself is also researched in the numbers. The followings were the main results.The particle contents of soils was not correlative with the sorption, however thetotal organic carbon (foc) was correlative with the CEC, and the relation of foc andCEC was CEC = 5.4563(foc) + 5.6051,R2 = 0.8921.TCE and Benzene were hardly absorbed by the quartz and kaolinite.The sorption capacity of soils on TCE and Benzene was correlative with the organiccarbon of soils. Three surface soils with rich organic carbon ,the isotherms of TCE andBenzene were linear, R2 for TCE and Benzene were 0.9738~0.9910 and 0.9203~0.9967,while three underground water with poor organic carbon, the isotherms were nonlinear,which can be described with Langmuir equation, R2 for TCE and Benzenewere0.8982~0.9426,0.9228~0.9902.The structure of organic carbon was hardly inflected to the sorption on TCE,however it was evidently done to sorption on Benzene. The partition coefficient(normalized to organic carbon ) logKoc of the samples and sub-samples for TCE were all2.086±0.168~2.274±0.169, and for Benzene logKoc(sample soils) was 2.791±0.113~3.455±0.292,logKoc(sub-samples)was 1.848±0.142~2.026±0.142. The incompactblack carbon particle aggregation had more adsorbability to Benzene than to TCE.The total sorption capacities of organic carbon on TCE equal to the sorptioncapacities of incompact carbon aggregation and compact carbon aggregation.In the experiment systems, the sorption percents of Benzene were 0.1%~80% , andthese of TCE were 30%~70%. The percents in solution of Benzene were 0.1%~80%,however these of TCE were 30%~60%. The volatilization percents of Benzene were upto 20%, and these of TCE were also up to 33%.
Keywords/Search Tags:soil/sediment, sorption/adsorption, volatile Organic chemical, Benzene, trichloroethyene(TCE)
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