【摘要】 科学认识和全面理解合流制面源污染发生路径和污染贡献源对于治理和改善城市水环境至关重要.本研究以珠海市典型老城区的合流制小排水区为例,分析了污染物在地表与管道中的累积-冲刷过程,并运用质量守恒法解析了污染物的贡献源.结果表明,地表街尘累积量为（28. 81±10. 69） g·m^-2,多场降雨事件中地表街尘冲刷量为（19. 27±10. 90） g·m^-2,冲刷率为（52. 69±13. 3）%,其冲刷形成的地表径流中SS场降雨浓度为52～109 mg·L^-1,管道径流中SS的浓度为68～158mg·L^-1;地表径流对SS的贡献率为39%～72%,旱流污水对SS的贡献率<20%,管道沉积物再悬浮对SS的贡献率为13%～56%;管道沉积物的厚度在小雨和中雨时增加1～14 cm,大雨和暴雨时,减少7～17 cm;降雨特征影响了污染源贡献比率,其中地表径流对各污染物的贡献范围为2%～52%,旱流污水对各污染物的贡献率范围为9%～65%,管道沉积物对各污染物的贡献范围为8%～81%.基于上述研究结果,为合流制面源污染提出控制措施,以期为我国城市受纳水体污染的解决提供参考.更多还原

【Abstract】 A comprehensive and scientific understanding of non-point source pollutant transport pathways and source apportionment in combined sewer systems is essential for managing and improving the urban water environment.This study analyzed build-up and washoff processes of pollutants on road surfaces and in sewers within a catchment of combined sewer systems in a typical old district in Zhuhai.Besides,source apportionment of the entire urban non-point source pollution was investigated by using the mass conservation method.The outcomes revealed that the build-up load of road deposited sediments in the study area was（28.81±10.69）g·m^-2.The average wash-off load of road deposited sediments during five different rainfall events was（19.27±10.90）g·m^-2 and the wash-off percentage was（52.69±13.3）%.The event mean concentrations of suspended solids（SS） in road runoff were 52-109 mg·L^-1,and the event mean concentrations of SS in sewer runoff were 68-158 mg·L^-1.Source apportionment analysis showed that road runoff,domestic wastewater,and sewer sediments contributed 39%-72%,<20%,and 13%-56% to SS,respectively.The thickness of sewer sediments increased by 1-14 cm during light and moderate rains,and the thickness decreased by 7-17 cm during heavy rains.It was found that rainfall characteristics affected the contribution percentages of pollution sources.The contribution of pollution from road runoff,domestic sewage,and sewer sediments in combined sewer systems were 2%-52%,9%-65%,and 8%-81%,respectively.The derived outcomes should be useful for developing recommendations to control non-point source pollution in combined sewer systems and improve urban receiving water quality in China.更多还原