
改良型透水混凝土铺装去除径流污染物的试验研究
刘蕊, 郜会彩, 应鹏
改良型透水混凝土铺装去除径流污染物的试验研究
Experimental Research on the Removal of Runoff Contaminants by Modified Permeable Concrete Pavement
为研究建筑废弃物再生骨料应用于透水铺装中对径流水质的净化效果,对透水混凝土面层和内部结构进行改良,制备了改良型透水混凝土铺装,同时制备普通透水混凝土铺装作为对照。通过开展不同降雨重现期、不同降雨间歇时间情况下的模型试验,研究了改良型透水混凝土铺装系统对径流典型污染物SS、COD、TN和TP的净化能力。结果表明,改良型透水混凝土铺装对各类污染物的去除效果随着降雨重现期的增大而减弱;改良型透水混凝土铺装去除径流污染物的能力强于普通透水混凝土铺装。降雨间歇时间的增加对COD和TP的出水浓度影响为先降低后趋于稳定,但对SS和TN的去除影响较小。
In order to study the purification effect of construction waste recycled aggregates used in permeable pavement on runoff water quality, the surface layer and internal structure of permeable concrete are improved, and an improved permeable concrete pavement is prepared. At the same time, ordinary permeable concrete pavement is prepared as a control. Based on the model tests under different rainfall reappearing periods, different rainfall intervals, the purification ability of the improved permeable concrete pavement system on typical runoff pollutants SS, COD, TN and TP is studied. The results show that the effect of improved permeable pavement on the removal of various pollutants decreases with the increase in the rainfall reappearing period; the removal ability of runoff pollutants by improved permeable concrete pavement is better than that of ordinary permeable concrete pavement. With the increase in rainfall interval time, the effluent concentration of COD and TP decreases firstly and then becomes stable, but the removal of SS and TN is less affected.
透水铺装 / 再生骨料 / 径流雨水 / 污染物去除 {{custom_keyword}} /
permeable pavement / recycled aggregate / runoff rainwater / pollutant removal {{custom_keyword}} /
表1 各层组成及材料设置Tab.1 Composition and Material Setting |
类型 | 结构层 | 厚度/mm | 材料 |
---|---|---|---|
普通透水 混凝土铺装 | 面层 | 80 | PO42.5级普通硅酸盐水泥、粒径为5 mm天然骨料等 |
找平层 | 20 | 粒径为5~8 mm中砂 | |
垫层1 | 100 | 10~18 mm级配碎石 | |
垫层2 | 100 | 20~26 mm级配碎石 | |
土壤基层 | 100 | 绍兴地区黄壤土 | |
改良型透水 混凝土铺装 | 面层 | 80 | PO42.5级普通硅酸盐水泥、粒径为5 mm再生骨料等 |
找平层 | 20 | 粒径为5~8 mm中砂 | |
垫层1 | 100 | 10~18 mm级配再生骨料 | |
垫层2 | 100 | 20~26 mm级配再生骨料 | |
土壤基层 | 100 | 绍兴地区黄壤土 |
表2 污染物分析方法Tab.2 Pollutant analysis methods |
检测指标 | SS | COD | TN | TP |
---|---|---|---|---|
分析方法 | 重量法 | 快速消解分光光度法 | 过硫酸钾-紫外分光光度法 | 钼锑抗分光光度法 |
表3 不同重现期下模拟降雨设置Tab.3 Modulated rainfall settings for different recurrence periods |
重现期P/a | 时间t/min | 降雨强度i/(mm·min-1) | 降雨量V/L |
---|---|---|---|
2 | 60 | 0.661 | 1.25 |
5 | 60 | 0.835 | 1.60 |
10 | 60 | 0.960 | 1.80 |
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