树脂对稠油污水中Ca2+、Mg2+的吸附动力学及机理研究

随着国内油田稠油的不断开采和水资源的日趋紧张,需要将稠油污水进行软化处理和回收利用。根据稠油污水的特性,分别对大孔强酸树脂、大孔弱酸树脂、凝胶强酸树脂、大孔氨基磷酸树脂和大孔亚氨基二乙酸树脂这五种常用树脂进行了静态筛选实验,并且进行了动力学研究,得出拟二级反应动力学模型能更好地描述树脂对稠油污水中Ca2+、Mg2+的吸附行为。由模型结果可知,吸附速率同时受粒内扩散和液膜扩散的影响,但粒内扩散是吸附速率的主要控制步骤。

Study on kinetics and mechanism of adsorption for Ca2+ and Mg2+ in the wastewater by resins

with the continuous mining of heavy oil in domestic oilfield and shortage of water resources,the effective treatment and recycling of heavy oil wastewater are urgent.According to the characters of heavy oil wastewater,the kinetics of the sorption of humic acid onto five macro porous adsorption resins in aqueous solution was investigated in batch experiments.The experiments showed that the pseudo second-order equation could describe the sorption process of Ca2+ and Mg2+ in heavy oil wastewater.However,from the model we can conclude that the adsorption rate was controlled by film diffusion and particle diffusion simultaneously,but particle diffusion was the key step of the adsorption rate.