生物滞留设施中添加麦饭石对锌的吸附性能研究

Study on the Adsorption Properties of Medical Stone Added to Bioretention Facilities for Zinc Solution

生物滞留技术是具有发展前景的城市雨水处理措施之一,生物滞留系统中填料的组成及配比对系统功能的发挥尤为重要。该文通过体外试验分别从麦饭石的添加量、溶液初始浓度、吸附时间等方面研究麦饭石对重金属Zn的吸附作用,确定其最佳吸附条件。试验为优化生物滞留系统填料层,将锌溶液通入装有酸洗石英砂与麦饭石的圆柱形PVC管来模拟污水在生物滞留系统填料层的运行,研究了填料对重金属锌的去除效果。试验结果表明:添加麦饭石的试验柱对锌的去除率远远大于未添加麦饭石的试验柱;添加有不同质量麦饭石的试验柱去除效果都很高,且去除效果受干湿交替因素影响不显著,能在较长时间保持稳定。麦饭石作为填料添加剂具有高效、长效的去除效果,因此推荐将麦饭石作为生物滞留系统的填料。

The bioretention technology is one of the urban rainwater treatment measures.The composition and proportion of the filler in the biological retention system are very important to the function of the system.In this paper,the adsorption prop?erties of medical stone on heavy metal Zn was studied from the addition of the medical stone,the initial concentration of the solution and the adsorption time,then the best adsorption conditions were determined.In order to optimize the packing layer of bioretention system,a cylindrical PVC tube containing acid washed quartz sand and medical stone was used to simulate the operation of sewage in the packing layer of the biological retention system,and the removal effect of heavy metal zinc was studied.The test results showed that the removal rate of zinc was much greater than that of the test column without the addi?tion of medical stone.The removal efficiency of the test columns with different quality of medical stone was very high,and the removal effect was not significantly influenced by the dry and wet factors,and it could keep stable for a long time.As a filler additive,medical stone has high efficiency and long effect.Therefore,it is recommended that medical stone be used as a filler for bioretention system.