School of Water Conservancy Science and Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, People's Republic of China.
Environ Geochem Health. 2020 Sep;42(9):2963-2973. doi: 10.1007/s10653-020-00537-y. Epub 2020 Feb 25.
With the acceleration of urbanization and industrialization, urban air pollution, especially dust pollution, has become a global problem. The traditional method to control dust problem is to spray roads with tap water. However, this method will inevitably lead to a huge waste of water resources. Using reclaimed water instead of tap water for dust control can not only achieve the same effect of reducing dust and haze, but also save water resources. In addition, the saved tap water can be used for production and life, thereby obtaining additional benefits. In order to quantify the eco-economic benefits of sprinkling water for dust control, a quantitative method was proposed based on the emergy theory of ecological economics. It was used to calculate the cost of different water resources, the cooling and humidifying benefit, the dust control and haze reduction benefit, and the other use benefit. Taking the 2017 data of Zhengzhou as an example, the results indicated that the cost of using reclaimed water to control dust was reduced by 54%. The total benefit of using reclaimed water was about 1.30-1.80 times that of using tap water, and the net benefit was 4.65-7.17 times. Therefore, the use of reclaimed water instead of tap water for road dust control has advantages of low cost and high eco-economic benefits. The method proposed in this paper can provide quantitative basis for the popularization of using reclaimed water to dust control in cities with serious air pollution and water resource shortage.
随着城市化和工业化的加速，城市空气污染，特别是扬尘污染，已成为全球性问题。传统的控制扬尘问题的方法是使用自来水喷洒道路。然而，这种方法必然会导致水资源的巨大浪费。使用再生水代替自来水进行扬尘控制，不仅可以达到同样的降尘减霾效果，还可以节约水资源。此外，节省的自来水可用于生产和生活，从而获得额外的效益。为了量化扬尘控制洒水的生态经济效益，提出了一种基于生态经济能值理论的定量方法，用于计算不同水资源的成本、冷却增湿效益、扬尘控制和减霾效益以及其他用途效益。以郑州市 2017 年的数据为例，结果表明，使用再生水控制扬尘的成本降低了 54%。使用再生水的总效益约为使用自来水的 1.30-1.80 倍，净效益约为使用自来水的 4.65-7.17 倍。因此，使用再生水代替自来水进行道路扬尘控制具有成本低、生态经济效益高的优势。本文提出的方法可为在空气污染严重和水资源短缺的城市推广使用再生水进行扬尘控制提供定量依据。
