道路降尘与扬尘PM_(10)排放的关系研究

道路扬尘是城市大气颗粒物主要来源之一,文章主要分析呼和浩特城区道路降尘排放、扬尘PM10排放强度并研究二者之间的关系。对呼和浩特30条典型道路进行了降尘监测,并在降尘监测期间对道路尘负荷进行了采样分析,同时记录车流量和车辆构成数据,应用AP-42排放因子模型计算PM10排放强度,分析道路降尘与PM10排放强度之间的关系。结果发现,道路降尘值为外环路>主干路>次干路>支路>胡同,分别为76.3、36.1、31.7、25.8和19.0 t(/km.230d),背景值为9.4 t(/km.230d);外环路、主干道、次干道、支路和胡同的PM10排放强度平均值分别为178、169、130、100和11 kg(/km.d);降尘值DF与道路扬尘PM10排放强度呈现较好的正相关关系,道路扬尘PM10排放强度可以用降尘表示为Q=2.6×(DFr-DFb)。

Relationship of Road Dustfall and Fugitive PM10 Emission

Road fugitive dust(RFD) is a main source of atmosphere particulate matter in city.Road dust-fall(DF) was monitored and PM10 emission strength was calculated with AP-42 emission factor model in Huhhot roads,the feasibility of DF monitor RFD was studied.DF of 30 roads were monitored and silt loading,traffic volume and mean weight of the vehicle fleet were sampled,analyzed and recorded,and PM10 emission strength were calculated of the monitored roads,relationship of DF and PM10 emission strength was studied.Results showed that DF values of the roads were out circle road > major arterial > minor arterial > collector > local,with the values as 76.3,36.1,31.7,25.8 and 19.0t/(km2·30d) respectively,and the background value was 9.4t/(km2·30d).PM10 emission strength of the out circle road,major arterial,minor arterial,collector and local were 178,169,130,100 and 11 kg/(km·d) respectively.DF positively correlated with PM10 emission strength,and the latter can be calculated by formula Q=2.6×(DFr-DFb),it is feasibility for DF to evaluate RFD emission and study characteristics of RFD.