【摘要】 为解决天然膨润土渗透性差,直接作为吸附固化剂去除土壤重金属离子污染物效率低的问题,本文优化了草木灰、钢渣和膨润土配比,高温焙烧改性制备一种新的复合材料,并进行了改性膨润土复合材料试件的渗储实验。实验结果表明:改性膨润土复合材料既能高效净化污水,对水中浓度为10mol/L的Cu²⁺的去除率达到98%以上,又具良好的渗储作用,其渗透率上限是天然膨润土渗透率的105倍,污水通过改性膨润土的渗流速度与压力梯度呈正指数变化的非达西渗流;渗透率随含水率的增加呈负指数变化规律,由于渗流过程受水体中固体沉淀污染物的影响,渗透率随渗流时间的增加而减小,在吸湿和脱湿过程中,含水率随时间呈双线性变化规律。更多还原

【Abstract】 In order to solve the problem that the poor permeability of natural bentonite which reduces the efficiency of removing pollutants in the treatment of heavy metal ion pollution directly as absorption curing agent, by optimizing the proportion of plant ash, steel slag and bentonite with high-temperature roasting modification, a new composite material is fabricated. The experiment on the permeability and storage of modified bentonite composite specimens shows that the modified bentonite composite can not only purify the sewage efficiently, the Cu²⁺ removal rate in water with concentration of 10 mol/L reaches over 98%, but also has good permeability and storage.The upper limit of permeability is 105 times than that of the natural bentonite, and the percolation velocity and the pressure gradient of modified bentonite shows a non-Darcy flow with a positive exponential change. With the increase of water content, the permeability decreases with negative exponential trend. Since affected by the solid contaminants in water, the permeability decreases with the increase of the percolation time. During the moisture absorption and dehumidification, the curve of moisture content changes with time shows a bilinear form.更多还原