Abstract
The road runoff after rainfall carries a lot of pollutants that could cause great harm to the water environment. A biochemical pool can be used as a treatment for the road runoff. In order to further improve the efficiency of road runoff treatment by biochemical pool and to evaluate the purification effect of the aquatic plants, two aquatic plants of Iris pseudacorus and Myriophyllum verticillatum were chosen in this research. The effect of different planting densities on the treatment of runoff pollutants and the planting mode by different aquatic plants were studied. The results show that both plants have the ability to remove the pollutants like chemical oxygen demand (COD), Zn, Cu, oil, and suspended solids (SS), and the ability is increased with the increase of planting density. The Iris pseudacorus is better than Myriophyllum verticillatum on the removal of Zn, while Myriophyllum verticillatum does better on the removal of Cu, oil, and SS. Combined planting mode can effectively improve the purification effect of COD and petroleum.
Highlights
With the continuous development of transportation, the highway environmental problems brought by the operation of transportation infrastructure cannot be ignored [1,2]
Holffman [6] in the, Narragansett Bay, USA, Gan et al [7] in Guangzhou, China, Zhao [8] in Xi’an, China, analyzed the pollutant components in road runoff, and the results indicated that the concentration of suspended solids (SS), chemical oxygen demand (COD), heavy metals, petroleum, and other pollutants in road runoff from different countries and regions may exceed the grade II water quality standard for surface water
Chen et al [28] selected a variety of combinations of aquatic plants for experimental research in small constructed wetlands, and the results found that it had a good removal effect of heavy metals
Summary
With the continuous development of transportation, the highway environmental problems brought by the operation of transportation infrastructure cannot be ignored [1,2]. Holffman [6] in the, Narragansett Bay, USA, Gan et al [7] in Guangzhou, China, Zhao [8] in Xi’an, China, analyzed the pollutant components in road runoff, and the results indicated that the concentration of suspended solids (SS), chemical oxygen demand (COD), heavy metals, petroleum, and other pollutants in road runoff from different countries and regions may exceed the grade II water quality standard for surface water. Wu et al [18] added cattail litter into a surface flow constructed wetland (SFCW) system to utilize as an additional carbon source for the denitrification process, which can improve nitrogen removal These studies fall under the category of using plants for sewage treatment. Chen et al [28] selected a variety of combinations of aquatic plants for experimental research in small constructed wetlands, and the results found that it had a good removal effect of heavy metals. The difference between the biochemical pond and the constructed wetland is that it can be used as a sewage disposal device in case of water pollution caused by chemical leakage accident during road transportation, generally used as water environment protection device along the road in water source protection area
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