Journal of Ecology and Rural Environment ›› 2020, Vol. 36 ›› Issue (8): 1064-1071.

### Study on Purification of Runoff Contaminants From Hard Revetment by Ecological Mats Under Simulated Conditions

SHAO Kai-di1, DUAN Jing-jing2, XUE Li-hong2, XU De-fu1

1. 1. School of Environmental Science and Engineering, Nanjing University of Information Science&Technology, Nanjing 210044, China;
2. Institute of Resources and Environment, Jiangsu Academy of Agriculture Science/Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture, Nanjing 210014, China
• Received:2020-01-17 Online:2020-08-25 Published:2020-08-21

Abstract: Concrete and masonry stones were used to reinforce the riparian zone, which led to serious damage to the ecosystem of riparian in China. The ability of riparian to intercept and remove contaminants in runoff is basically lost, which intensified the eutrophication of rivers.In view of this common phenomenon in urban areas, the ecological mats were chosen to restore and transform the hard revetment in order to improve the effect of interception to contaminants. After the experiment of substrate screening, the combination of pelelith-ryegrass and coir-ryegrass with better growth was screened for the subsequent experiment. These two kinds of ecological mats had good effect of interception on TSS (>86%), and they were not affected by rainfall intensity and slope. In the simulated runoff experiment, TN and NH4+-N removal efficiency of ecological mats decreased with the increase of slope, rainfall intensity and the time of rainfall.The removal rate of TN and NH4+-N by coir ecological mats under 45° of slope and light rain was 51% and 73%, respectively, which is better than that of pelelith ecological mats(33% and 47%).With the increase of rainfall intensity and slope, the advantage of nitrogen removal by coir ecological mats was not obvious anymore. The removal rate of TP in simulated runoff by ecological mats was poor and fluctuates greatly. The technology of ecological mats has the advantages of low cost, easy to cultivate, fast laying and collection, so it is a feasible remediation technology for improving the effect of the revetment on the interception of contaminants.

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