• 关键词：透水沥青路面  生态阻控  麦饭石  路面径流  蓄水层

• 基金项目：国家科技支撑计划项目（No.2015BAL02B04）；住房和城乡建设部科学技术项目（No.2015-K7-012）；江苏高校优势学科建设工程资助项目（No.PAPD）

• 骆辉
• 南京林业大学土木工程学院, 南京 210037

• 管凛
• 南京市市政设计研究院有限责任公司, 南京 210008

• 荆肇乾
• 南京林业大学土木工程学院, 南京 210037

• 胡小波
• 南京林业大学土木工程学院, 南京 210037

• 章泽宇
• 南京林业大学土木工程学院, 南京 210037

• 王印
• 南京林业大学土木工程学院, 南京 210037

• 王伟杰
• 南京林业大学土木工程学院, 南京 210037

• 摘要：为强化透水沥青路面对路面径流中氮、磷的控制效果，采用铁盐联合碱热技术制备了涂层负载改性麦饭石蓄水层集料，并运用场发射扫描电子显微镜（SEM）、能谱分析仪（EDS）和X射线衍射（XRD）等手段对改性后麦饭石集料的表面形态、特征和化学成分进行了表征.同时，通过静态吸附试验对TP的吸附效果及其作用机理进行了对比研究.最后将改性麦饭石作为蓄水层集料应用于透水沥青路面中，通过模拟降雨和周期蓄水试验探究其净化机制.结果表明：相比于天然麦饭石，铁盐联合碱改性麦饭石的表面性状发生了明显变化，最大饱和吸附容量明显提高，对氨氮和磷酸盐的吸附容量分别从1.32 mg·g^-1和1.48 mg·g^-1提升到12.82 mg·g^-1和6.38 mg·g^-1；降雨全过程中改性蓄水层路面对NH₄⁺-N的整体去除效率可提高20%左右，对TP的净化效率至少可提高15%，蓄水阶段较模拟降雨阶段污染物的去除效果显著提高，改性后麦饭石蓄水层24 h后的出水水质均可达Ⅲ类水标准，强化蓄水层和提高蓄水时间是提高路面径流净化效率的有效措施.因此，本实验中铁盐联合碱热技术制备的改性麦饭石可推荐用于海绵城市生态处理设施透水沥青路面中削减氨氮和总磷的污染负荷.

• Abstract：In order to improve the capacity of permeable asphalt pavement on the removal of nitrogen and phosphorus in road runoff, the coating-modified maifanite, which is used for reservoir substrate, was prepared with iron and alkali-heat technology. The scanning electron microscope, energy dispersive spectrometer and XRD were used to characterize the surface morphology and chemical composition of the substrates before and after modification. The TP adsorption performance were compared by static adsorption test. Finally, the purification mechanism was explored by simulating rainfall and periodic water storage experiments. The results show that compared with natural maifanite, the surface properties of Fe-alkali-modified maifan stone changed significantly. The adsorption capacity of NH₄⁺-N and TP increased significantly, form 1.32 mg·g^-1 and 1.48 mg·g^-1 to 12.82 mg·g^-1 and 6.38 mg·g^-1, respectively. the modified reservoir structure pavement could increase the overall removal rate of NH₄⁺-N by about 20% during the process of rainfall, and the removal efficiency of TP improved by 15%. The interception amount of pollutants in the storage test was significantly higher than that in the rainfall. After the storage time of 24 h on modified maifanite reservoir, the effluent quality can satisfy the Class Ⅲ water quality standard. Enhancing the reservoir structure and prolongning the storage time is a good way to remove the runoff pollutant. Therefore, the modified maifanite prepared by the iron combined with the alkali-heat technology in the experiment is recommended as a ecological treatment approach to reduce the pollution of NH₄⁺-N and TP in the permeable asphalt pavement.

• Key words：permeable asphalt pavement  ecological control  maifan stone  road runoff  reservoir structure

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