通过模拟土柱实验,利用炉渣、蛭石、水淬渣、砂子等廉价易得的材料来改善草甸棕壤的渗透性能,并对构建的4组地下渗滤系统在冬季和夏季的污水处理效果进行了研究.结果表明,加入改良材料后,改良渗滤基质的渗透性比草甸棕壤均有了显著提高,4种改良材料的最适添加质量比为5%;炉渣、蛭石、水淬渣、砂子、草甸棕壤的TP吸附行为均符合Langmuir模型,拟合的相关系数都在0.89以上,TP饱和吸附量分别为0.714、0.625、1.000、0.060、0.357 mg/g;冬季和夏季,4组地下渗滤系统对TP的去除效果相差不大,出水TP始终小于0.4 mg/L;4组地下渗滤系统夏季对COD、TN、NH4+-N的去除效果略高于冬季,无论冬季还是夏季,出水COD均低于43 mg/L,TN去除率均低于70%,出水的NH4+-N、TN浓度均达到<城市污水处理厂污染物排放标准>(GB18918-2002)的一级标准.%The soil column experiments with meadow palm soil as substrate were conducted to simulate the water purification in subsurface infiltration system. Four cheap and available materials (boiler slag, vermiculite, watergranulated slag of blast-furnace and sand) were mixed in the substrate separately to improve the penetrability of infiltration system,the performance of 4 improved systems for water purification were detected. Results showed that the penetrability of meadow palm soil was greatly improved after mixing these materials, and the optimum mixing ratio was 5 ％. The phosphorus adsorption behavior in boiler slag, vermiculite, water-granulated slag, sand and meadow palm soil could be well simulated by Langmuir equation with the correlation coefficient all above 0.89,the maximum phosphorus absorption capacities were 0. 714,0. 625,1. 000,0. 060,0. 357 mg/g, respectively. For the 4 improved infiltration system,TP removal in summer and in winter presented no significant difference,the effluent TP kept lower than 0. 4 mg/L; the removal efficiency of COD,TN and NH4+-N in summer was little higher than that in winter,effluent COD was under 43 mg/L while the TN removal rate was limited to 70％. Effluent NH4+-N,TN of four subsurface infiltration systems could meet the first degree of integrated wastewater discharge standard.
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