The Composition of Urban Storm-water Runoff Pollutants in Sediment and Loess Soil in Rain Garden
Chao Guo 1, 2, 3, 4  
,   Jiake Li 4  
,   Huaien Li 4  
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Shaanxi Provincial Land Engineering Construction Group, Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural Resources
Shaanxi Provincial Land Engineering Construction Group, Shaanxi Provincial Land Consolidation Engineering Technology Research Center
Shaanxi Provincial Land Engineering Construction Group, Land Engineering Technology Innovation Center, Ministry of Natural Resources
State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China
Submission date: 2020-03-14
Final revision date: 2020-08-28
Acceptance date: 2020-09-05
Online publication date: 2021-04-23
Many studies have demonstrated the importance of the volume reduction and pollutants purification effect of rain gardens. However, the pollutants variations in sediment of rainfall runoff and soil of rain gardens have been rarely explored. In this study, three rain gardens were conducted from April to October 2018 to investigate the pollutants composition of urban stormwater runoff in sediment and soil. The results show that: 1) NO2-N and TON were the main forms in the sediments, but for soil, they were NO3-N and TON.NH3-N, NO2-N, TON, TN, SRP and TP in the sediment were all greater than those in soil, and they were 4.54, 5.0, 2.01, 1.33, 4.1, 14.3 and 2.21, 3.25, 1.62, 1.11,2.5, 5.3 times greater in sediment than those in soil. However, less NO3-N content was observed in the sediment. 2) Cu, Zn and Cd in sediment were extremely greater than those in soil. Cu was 22.47 and 4.02 times greater in sediment than that in soil, which were 18.93, 6.11 and 4.60, 8.57 times for Zn and Cd. 3) the N, P, TOC and heavy metals contents had a good linear relationship with the activity of enzymes, and the R2 were all more than 0.66