【摘要】 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。更多还原

【Abstract】 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,water-granulated 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 NH+4-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 NH+4-N,TN of four subsurface infiltration systems could meet the first degree of integrated wastewater discharge standard.更多还原