State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
J Environ Sci (China). 2023 Feb;124:735-744. doi: 10.1016/j.jes.2021.12.005. Epub 2021 Dec 21.
Fugitive road dust (FRD) contributes a great deal to urban rainwater and air pollution and is commonly controlled by water-sprinkling in most Chinese cities. However, there is a lack of information on its effectiveness. We used the Testing Re-entrained Aerosol Kinetic Emissions from Roads (TRAKER) method to monitor different types of roads in Baoding city before and within 1 hr after water-sprinkling and obtained the road dirtiness index (a) and PM concentration in the road environment (T), to evaluate the removal efficiency for PM deposited on the road surface (η) and the reduction efficiency for the PM concentration in the road environment (η). The results give that the η for three types of roads is ranked: branch road (87%--100%) > major arterial road (80%-83%) > minor arterial road (68%-77%), and the η ranked: minor arterial road (70%) > branch road (46%-58%) > major arterial road (37%-53%). The η and η varied non-linearly with time and presented a quadratic curve. The average effective control time (η> 0) was 62 min on the major and minor arterial roads, and much longer than 1 hr on branch roads. The η values diminished completely by 72 min on average from the end of sprinkling for the three types of roads. Water-sprinkling can remove PM particles from the road surface and reduce their concentration in the road environment more thoroughly than PM. Our findings could be helpful for controlling urban FRD emissions more efficiently and precisely.
道路扬尘（FRD）对城市雨水和空气污染有很大的影响，在中国大多数城市通常通过洒水来控制。然而，关于其效果的信息却很缺乏。我们使用 Testing Re-entrained Aerosol Kinetic Emissions from Roads（TRAKER）方法，在保定市的不同类型道路上进行了洒水前后 1 小时内的监测，获得了道路污垢指数（a）和道路环境中的 PM 浓度（T），以评估沉积在路面上的 PM 的去除效率（η）和道路环境中 PM 浓度的降低效率（η）。结果表明，三种类型道路的 η 值排名为：支路（87%-100%）>主要干道（80%-83%）>次要干道（68%-77%），η 值排名为：次要干道（70%）>支路（46%-58%）>主要干道（37%-53%）。η 和 η 随时间呈非线性变化，呈二次曲线。主要和次要干道上的有效控制时间（η>0）平均为 62 分钟，而支路上的时间则远远超过 1 小时。三种类型道路的洒水结束后，η 值平均在 72 分钟内完全消失。洒水可以更彻底地从路面上清除 PM 颗粒，并降低其在道路环境中的浓度。我们的研究结果可以帮助更有效地和更精确地控制城市 FRD 排放。
