土壤对苯系物的吸附行为研究

Adsorptive behavior of BTEX Mixtures on soils

为保护石化工业区重要的地下水源地,选取淄博市代表性土壤,采用静态吸附平衡法,研究了苯系物在天然土壤中的吸附行为.以吸附理论为基础,考察了混合苯系物在土壤中的吸附动力学过程、吸附-解吸等温线和不同因素对吸附的影响.结果表明,Henry直线型吸附模型较好地拟合了土壤中苯系物的吸附-解吸等温线,解吸过程存在明显滞后现象,且有机质仍然是影响吸附的主要因素.由于土壤体系自身具有较强的缓冲能力,pH值和盐度对吸附过程的影响不显著.另外,温度升高,土壤对混合苯系物的吸附量增大,这可能与苯系物溶解度随温度变化的规律有关.

Abstract：In order to protect the important groundwater resources in petrochemical industrial area in Northern China, the experiments took the typical soils of Zibo city as samples and studied the adsorption/desorption process of BTEX mixtures on soils. The laboratory testing programs were carried out to investigate the effects of organic matters, pH value, salt content and temperature on the adsorption/desorption process of BTEX mixtures on soils. The results indicated that ad- sorption isotherm of BTEX mixtures on soils was linear and fitted well to the Henry model. Adorption-desorption hyster- sis was also found. In addition, organic matters continue to be the main factor in the adsorption process, but pH value and salt content had no obvious influence. Furthermore, the solubility of BTEX mixtures varying with temperature may be a critical factor for the remarkable influence of temperature in the process.