發(fā)布時間：2019-05-27 06:09

【摘要】：有機質(zhì)膠體與有機污染物的相互作用會影響污染物在多孔介質(zhì)中遷移轉(zhuǎn)化等環(huán)境行為.為研究有機質(zhì)膠體對藥物和個人護理品(PPCPs)在土壤環(huán)境中遷移的影響,本實驗以卡馬西平(CBZ)為目標污染物,用商用腐殖酸制備有機質(zhì)膠體,分別選擇石英砂、標準土和野外所取土樣為研究介質(zhì),通過室內(nèi)土柱模擬實驗探究有機質(zhì)膠體存在時污染物在多孔介質(zhì)中的遷移行為.結(jié)果表明,描述一維溶質(zhì)運移的兩點化學非平衡模型能夠較好模擬CBZ在各介質(zhì)土中的運移過程,說明污染物運移過程中與介質(zhì)間發(fā)生了化學非平衡吸附作用;石英砂柱中加入膠體后,對CBZ的吸附過程無明顯影響,但在解吸時阻滯因子及滯留量變小,可見膠體與石英砂間作用微弱,解吸過程中膠體與污染物結(jié)合形成復(fù)合體后對污染物有增溶作用;膠體存在時,標準土和自然土對CBZ的吸附量和遷移阻滯強度均明顯大于石英砂,其中有機質(zhì)及黏土礦物的作用最為明顯,有機質(zhì)中的低能/高能吸附位點以及黏土礦物極性表面均能夠固定污染物;由于有機質(zhì)含量較高,自然土對CBZ在吸附-解吸過程中的阻滯截留強度大于標準土.針對本實驗中CBZ的遷移情況,提出了疏水性有機污染物在含有機質(zhì)膠體土壤中的遷移過程中各種作用的概念模型.
[Abstract]:The interaction between organic matter colloid and organic pollutants will affect the environmental behavior such as migration and transformation of pollutants in porous media. In order to study the effect of organic matter colloid on the migration of drug and personal nursing product (PPCPs) in soil environment, carbamazepine (CBZ) was used as the target pollutant to prepare organic matter colloid with commercial humic acid. Quartz sand was selected respectively. The standard soil and the soil samples taken in the field were used as the research medium. the migration behavior of pollutants in porous media in the presence of organic matter colloid was studied by indoor soil column simulation experiment. The results show that the two-point chemical non-equilibrium model describing one-dimensional solute transport can simulate the transport process of CBZ in each medium soil, which indicates that the chemical non-equilibrium adsorption occurs between the pollutant transport process and the medium. After adding colloid to quartz sand column, it had no obvious effect on the adsorption process of CBZ, but the blocking factor and retention decreased during desorption, which showed that the interaction between colloid and quartz sand was weak. In the process of desorption, colloid and pollutant combine to form complex, and it has solubilization effect on pollutants. In the presence of colloid, the adsorption capacity and migration blocking strength of CBZ in standard soil and natural soil are significantly higher than those in quartz sand, and the effect of organic matter and clay minerals is the most obvious. The low energy / high energy adsorption sites in organic matter and the polar surface of clay minerals can fix pollutants. Due to the high content of organic matter, the blocking and interception strength of CBZ in natural soil during adsorption and desorption was higher than that in standard soil. In view of the migration of CBZ in this experiment, the conceptual models of various roles of hydrophobic organic pollutants in soil containing organic colloids were proposed.
【作者單位】： 中國地質(zhì)大學(北京)水資源與環(huán)境學院水資源與環(huán)境工程北京市重點實驗室;
【基金】：環(huán)境保護公益性行業(yè)科研專項(201309001-4) 中央高�；究蒲袠I(yè)務(wù)費專項(35832015023)
【分類號】：X131

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