水体沉积物中石油类污染物释放的动力学过程实验研究

Kinetic process of oil pollutants released from aquatic sediments

以延安市主要供水水源-王窑水库底泥为对象,在静态实验条件下,对污染沉积物中石油类污染物释放的动力学过程进行了实验研究。结果表明:水体沉积物中石油类的释放主要取决于间隙水中石油类向上覆水体扩散的速度与强度。在高污染负荷情况下(实验中采用的污染沉积物负荷为59.752g/kg),石油类释放平衡时间长达3个月以上,释放强度可高达29 m g/L。建立了沉积物中石油类释放的动力学方程,并利用动力学方程对沉积物中石油类的释放过程进行了模拟,达到较高的精度。

Under static conditions, an experimental study was carried out on the kinetic process of oil pollutants released from sediments of WangYao reservoir--an important municipal source water of Yan＇an . The results show that the releasing intensity mainly depends on the oil diffusion rate and also on the intensity from pore water into overlap water. In the case of high intensity of sediments contaminated by oil （the load of contaminated sediments is 59. 752g/kg）, the teleasing equilibrium would last more than 3 months and the oil. content in the overlap water could reach 29mg/L. On the basis of this, a kinetic model was developed. It was shown that the simulation result by the kinetic model can well fit the measured data.