2种不同模块化填料组合的多级土壤渗滤系统的比较

Comparison of Two Types of Multi-soil-layering Treatment System Filled Different Paddings

以滇池入湖河流污水为对象,研究了2种不同模块化填料组合的多级土壤渗滤系统在不同运行条件下的处理效果差异.结果表明,各系统都具有较好的COD去除效果,平均去除率均在50%以上.沸石-陶结系统无论曝气与否,均具有高NH4＋-N去除能力,出水浓度〈1 mg/L.陶粒-红壤MSL系统在8∶1的气水比下,具有良好的氨氮去除能力,平均去除率为84%;在非曝气条件下氨氮去除能力相对低一些,在40%以下.非曝气沸石-陶结系统TN去除效果最好,平均去除率在68%以上,最高达到98%.其他3个系统在不同工况下TN去除效果差别较大.4个系统TP平均去除率在30%-90%之间,不同工况下去除效果不同.高污染负荷下,沸石-陶结系统（M1、M2）的磷去除能力较强,稳定状态下平均去除率均在80%以上.通过分析系统沿程氮转化效率,探讨了各系统的氮去除机制.

Two types of multi-soil-layering（MSL） systems, each of them was filled with different padding, including both the layers of mixture layers（ML） and permeable layers（ PL）, which designed for purifying polluted river water and for studying the difference of the pollutant removal efficiency between them under different operation conditions. The results indicated that the four systems all had great COD removal efficiency and the removal rate of each of them was above 50%. Zeolite-lightweight ceramic pellet system （Z-LCPS） has high removal efficiency of NH4＋ -N, and the concentration of the final outflow is below 1 mg/L. When the air and water ratio is 8：1, ceramisite-red clay system（C-RCS） has high NH4＋ -N removal rate which is up to 84%. However, the NH4＋ -N removal rate of C-RCS is below 40% under the un-aerated condition. The Z-LCPS under un-aerated condition has the best TN removal efficiency that the average removal rate of TN is above 68% and reaches the 98 % at best. Under the high pollutant loading, the TP removal efficiency of Z-LCPS（ M1, M2）is better than C-RCS, and under the stable period, the TP removal rate is above 80% . At last, the difference of the nitrogen removal mechanism between the four systems is analyzed through the changes of nitrogen concentration along the flow direction.