石油污染土壤胶体对多环芳烃的易化运移作用研究

发布时间：2019-03-14 10:55

【摘要】：采集辽河油田石油污染土壤样品并用离心法提取胶体(10～5μm、5～2μm、2μm),定性和定量研究石油污染土壤以及土壤胶体的主要理化性质。通过间歇实验研究不同pH(pH=4-9)、不同价态阳离子(Na+、Ca2+和Fe3+)和不同价态阴离子(NO3-、SO42-和P043-)存在下的胶体稳定性,并比较阳离子存在下石油污染土壤胶体和未受污染土壤胶体稳定性。通过淋滤实验研究石油污染土壤胶体在不同粒径(10～5μm、5～2μm、2μm)、溶液pH(3、6、9)和IS(0.001 mM、0.1 Mm、0.5 mM)环境条件下在土柱中运移规律以及对菲的易化运移作用。研究结果表明,石油污染土壤胶体稳定性随溶液的pH、阳离子、阴离子的变化而产生变化。并随着土壤胶体粒径的减小、溶液离子强度的减小和溶液pH的增加,土壤胶体的沉积能力减弱,运移能力增强。粒径2μm的土壤胶体对菲的运移程度最大,其次为粒径10～5 μm和5～2 μm,其淋出液中菲含量分别增加了142.42%、36.36%、 96.97%。石油污染土壤胶体对菲的运移能力随pH的增加而增加,随IS增加而减小。但当1S=0.5 mM时,石油污染土壤胶体对菲没有易化运移作用,其淋出液中菲含量减少了9.09%。
[Abstract]:The oil contaminated soil samples from Liaohe Oilfield were collected and the colloids (10 ~ 5 渭 m, 5 ~ 2 渭 m, 2 渭 m) were extracted by centrifugation. The main physical and chemical properties of oil contaminated soil and soil colloid were studied qualitatively and quantitatively. The colloid stability in the presence of different pH (pH=4-9), different valence cations (Na, Ca2 and Fe3, and different valence anions (NO3-,SO42- and P043 -) was studied by batch experiments. The stability of petroleum-contaminated soil colloid and unpolluted soil colloid in the presence of cationic ions was compared. The oil contaminated soil colloids with different particle sizes (10 ~ 5 渭 m, 5 ~ 2 渭 m, 2 渭 m), solution pH (3,6,9) and IS (0.001 mM,0.1 Mm,) were studied by leaching experiments. 0.5 mM) migration law in soil column and facilitation of migration to phenanthrene under environmental conditions. The results showed that the stability of petroleum contaminated soil colloid changed with the change of pH, cation and anion in the solution. With the decrease of the particle size of the soil colloid, the decrease of the ionic strength of the solution and the increase of the solution pH, the deposition ability of the soil colloid decreases and the migration ability of the soil colloid increases. The soil colloid with the diameter of 2 渭 m had the largest migration of phenanthrene, followed by 10 渭 m and 5 渭 m, and the content of phenanthrene in the eluate increased by 142.42%, 36.36% and 96.97%, respectively. The migration capacity of petroleum-contaminated soil colloids to phenanthrene increased with the increase of pH and decreased with the increase of IS. However, when 1S=0.5 mM was used, the oil-contaminated soil colloids did not facilitate the transport of phenanthrene, and the content of phenanthrene in the eluate decreased by 9.09%.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X53

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