摘要
通过释放试验,模拟了包气带中残油在河流冲刷及积水浸泡条件下残油的释放过程,讨论了温度对释放的影响.建立释放模型,并得到释放速率常数.结果表明:残油释放由初始快速和随后的慢速两个过程组成,振荡对油类释放有显著的影响,振荡时速率常数K_La,K_s值为2.482h^(-1).1.297^(-1),无振荡为0.8O7h^(-1),0.751h^(-1).振荡时两速率常数分别是无振荡的5倍和3倍;释放速率常数K_La,K_s值随温度的升高而增大,但变化幅度较小.模型求得△H_(溶解),△H_((?)吸)均大于0,分别为12.2kJ·mol^(-1),4.214kJ·mol^(-1).模型预测结果表明低温(5.10.15℃)时油类的释放过程与常温过程基本相同,但平衡浓度c^p显著减小.表明温度下降不影响释放过程,仅对油类释放量有影响.
The release processes of residual oil in unsaturated soil from Zihe river under conditions representative of those in site such as water flushing, residual water soaking were simulated through lab experiment. The effects of shaking and temperature on release were investigated. The release model was developed and the release rate was thus determinated. There was a rapid phase at first and a slow phase following it in the release process. The release rate KLa, Ks was 2.482h-1, 1.297h-1 in shaking respectively, and was 0.807h-1, 0.751h-1 in unshaking. The release rate of shaking was five times and three times of that of unshaking respectively. The release rate KLa, Ks increased with the temperature, but the amplitude of variation was small. The △Hdisolution and △Hdesorption calculated from the model was 12.2kJ·mol-1 and 4.214 kJ·mol-1 respectively. The model predicted that the release process of residual oil at 5, 10, 15℃ were almost the same as 25℃ but the balance oil concentration cp at low temperature was smaller than that of 25℃.
出处
《环境化学》
CAS
CSCD
北大核心
1999年第4期294-301,共8页
Environmental Chemistry
基金
山东省科委重点攻关项目
英国政府ODA项目的资助
