Condition of inflowing river, Roshi River with the low concentration of nutrient was simulated. Study took the hydrate calcium silicate and natural zeolite as the adsorbing medium. The experiment designed the different kind of filter columns operated at the same time, filling with hydrated calcium silicate, natural zeolite and mixtures of calcium hydrate and zeolite with ratio 1:3, 1:1 respectively. Through researching the removal effect of the nutrient by 4 different kinds of fdter columns by controlling the material proportion and HRT, it was affirmed that the filter columns with only silicate hydrate had best effect on the removal of phosphate, with average removal efficiency of 90.75 %, but the absorbing ability to ammonia nitrogen was unstable. The filter columns filled with only natural zeolite possess the weaker ability to absorb the phosphate, with average removal rate at 77.30 %, and was also affected by the filter velocity easily. It is concluded when the proportion of material is 1:1 and the filter velocity is 0.696 m/d, the removal effect of the nutrient is promoted definitely. The nutrient concentration of effluent could reach the Level Ⅲ standard of surface water in China. It could be used as the theory base in the project which removing the nutrient in the constructed wetland.%模拟洱海的入湖河流——罗时江低浓度氮磷营养盐条件,采用水化硅酸钙与天然沸石作为吸附介质进行滤柱试验.试验设计4个滤柱并列运行,分别装填单一水化硅酸钙滤料、单一沸石滤料、水化硅酸钙与沸石双层滤料(1:3)和水化硅酸钙与沸石双层滤料(1:1),对比不同滤柱在不同滤速条件下的效果.单一水化硅酸钙填充滤柱对磷酸盐的去除效果最高,平均可保持在90.75％左右,但对氨氮去除不稳定;单一的沸石填充滤柱对磷酸盐吸附能力较弱,平均在77.30％,且受滤速影响较大.在水化硅酸钙与天然沸石配比为1:1,滤速为0.696 m/d时,对低浓度营养盐的水质起到稳定良好的去除效率,出水浓度均可达到国家地表Ⅲ类水标准.
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