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构建4个粗放型绿色屋顶中试设施,考察不同基质组成的设施在实际降雨条件下出水中16种多环芳烃(PAHs)质量浓度并与降雨、沥青屋面径流、空白对照设施的出水进行对比.结果表明,8场监测降雨事件中,4种模拟屋面设施出流PAHs的平均质量浓度分别为145、166、151、160 ng·L~(-1),沥青屋面和空白对照设施出流PAHs的平均质量浓度分别为900 ng·L-1和270 ng·L~(-1),4个模拟设施出流PAHs质量浓度显著低于沥青屋面和空白对照设施;从质量负荷控制的角度,4个模拟设施均能有效控制屋面径流PAHs负荷,与空白屋面相比,平均负荷削减率为71.76%.绿色屋顶对PAHs的去除机制以基质材料的截留及吸附为主,同样基质配比的情况下,增加基质层厚度,能改善设施对PAHs的去除效果.将传统沥青屋面改造为粗放型绿色屋顶,有助于控制屋面径流PAHs排放.
Four extensive green roof pilot plants were constructed to investigate the concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in the effluents under different rainfall conditions and compared with those of rainfall, asphalt roof runoff and blank control facilities. The results showed that the average mass concentrations of outflow PAHs in the four simulated roofing facilities during the eight monitoring rainfall events were 145, 166, 151 and 160 ng · L -1, respectively, and that of asphalt roofing and blank control facilities The average mass concentration was 900 ng · L-1 and 270 ng · L -1, respectively. The effluent PAHs concentrations in four simulated facilities were significantly lower than those in asphalt roofs and blank control facilities. From the perspective of mass load control, four Compared with the blank roof, the average load reduction rate was 71.76% .At the same time, the removal mechanism of PAHs by green roof was mainly entrapment and adsorption of matrix materials, Increasing the thickness of the matrix layer can improve the removal of PAHs by the facilities.Transforming traditional bitumen roofs into extensive green roofs helps to control PAHs emissions from roof runoff.