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Sorption of Petroleum Hydrocarbons on Soil and Sorption of Selected Organic Pollutants on Petroleum-Contaminated Soil

Author: ChenHong
Tutor: QuanZuo
School: Dalian University of Technology
Course: Environmental Science
Keywords: Oil Adsorption / desorption Organic pollution PFOS Black carbon Dissolved organic carbon
CLC: X131.3
Type: PhD thesis
Year: 2009
Downloads: 771
Quote: 5
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Abstract


Soil adsorption of organic pollutants in the environment that affect their migration and transformation, fate and biological and ecological effects of the main factors. Petroleum pollutants as typical of the northeast old industrial base of organic pollutants, the adsorption behavior of its own and other organic pollutants adsorbed provide insight into the impact of high load combined pollution northeastern state of organic pollutants in complex environments behavioral and ecological risk, as well as its control and governance provide a scientific basis. Based on the study of petroleum hydrocarbons in the soil - water interface adsorption behavior, based on the depth of the oil - soil - water - and more complex system of organic pollutants in the adsorption behavior of the interface. Focuses on the soil black carbon and dissolved organic carbon adsorption on the contribution of petroleum hydrocarbons and mechanism, and the establishment of a water-miscible solvent in the presence of conditions, dissolved petroleum hydrocarbons and adsorption model. Systematic study of some typical polar, non-polar organic compounds and perfluorooctane sulfonate (PFOS) in petroleum-contaminated soil on the adsorption behavior of petroleum pollutants discussed the adsorption behavior of organic compounds mechanism of action. Paper made the following findings: (1) petroleum hydrocarbons in the soil adsorption coefficient on soil organic carbon content and positive linear correlation, but has nothing to do with the clay content, clear the soil organic matter is adsorbed on petroleum hydrocarbon sources. Different Soil - water ratio (SSR) the petroleum hydrocarbon adsorption coefficient (K OC ) is not constant and there is desorption hysteresis, the hysteresis factor as the increase of the SSR, K OC as the SSR increases. (2) Petroleum Hydrocarbons in acetone water systems comply with log-linear model solubilization, on this basis, through the determination of petroleum hydrocarbons in acetone - water - soil system in the adsorption isotherms calculated dissolved organic carbon adsorption on oil coefficient (logK DOC ) was 4.34, higher than its particulate organic carbon adsorption coefficient of about 1 log unit. Petroleum hydrocarbons by measuring the soil after the ignition and the original soil adsorption isotherms calculated in the presence of other organic matter, carbon black soil adsorption capacity of petroleum hydrocarbons (K F, BC env ) is 10 2.55 ± 0.21 L / kg. (3) the use of polar, non-polar organic compounds in the oil-contaminated soil on the effects of oil on the adsorption behavior of other organic pollutants adsorption behavior. The results show that the non-polar and iso Caodan phenanthrene, when the oil concentration of less than 1 g / kg or so, their adsorption capacity did not change significantly; when the oil concentration is greater than 1 g / kg or so, the oil of phenanthrene and iso Gerbera Dan has a strong adsorption capacity, log K oil values ??were 5.03 ± 0.16 and 3.94 ± 0.10 L / kg, respectively, compared with their corresponding log K TOC High out about 4 times and 3 times. However, the crude oil on the polarity of atrazine and diuron almost no adsorption. Special point is the adsorption of atrazine and diuron main adsorption mechanism, adsorption capacity of the adsorbent polarity positive relationship does not exist. (4) studied the oil for ionic compounds PFOS adsorption behavior. Oil on PFOS adsorption ability, K oil values ??than PFOS in natural and organic carbon adsorption capacity K OC high a log unit around; nature of the solution (pH value and [Ca 2 - ]) for PFOS in the oil - water adsorption capacity of no significant impact. PFOS in oil PFOS mainly through adsorption on hydrophobic surface of the oil terminal and hydrophobic interaction that occurs in the oil - water interface. (5) explores the black carbon adsorption mechanism for PFOS. At pH = 5.0, [Ca 2 ] = 0.5 mM solution, and black carbon (SRM 2975) for PFOS adsorption is more linear and the adsorption capacity (log K BC ) natural organic carbon adsorption capacity for PFOS (log K OC ) no significant difference, and therefore the nature of the solution, BC for PFOS adsorption did not show their common nonlinear and strong adsorption capability. Nature of the solution for PFOS adsorption characteristics on BC have a significant impact. With the decrease in pH in the solution or the [Ca 2 ] elevated, PFOS on BC linear adsorption capacity and adsorption significantly increased. Therefore, in the solution, and the real environment under a low concentration of PFOS, BC for PFOS adsorption is particularly important contribution. PFOS adsorption mechanism on BC is assigned the role of electrostatic interactions and co-existence. These research data and results help understand and predict the northeastern region of petroleum pollutants fate and ecological risk, as well as explore the oil-contaminated areas other organic pollutants fate and migration and transformation of providing a scientific basis.

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CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Chemistry > Environmental pollution, chemical > Soil pollution chemistry
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