Volume 9 Issue 2
Mar.  2019
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Article Navigation >  Journal of Environmental Engineering Technology  > 2019  >  9(2): 181-187
REN Yaozong, LIU Guo, YU Hong, YANG Tianxue, WU Youbing, XU Qiujin, PANG Yan, LI Dongyang, LI Qi. Removal characteristics of pollutants by riverine natural wetland in prairie region[J]. Journal of Environmental Engineering Technology, 2019, 9(2): 181-187. doi: 10.12153/j.issn.1674-991X.2018.12.290
Citation: REN Yaozong, LIU Guo, YU Hong, YANG Tianxue, WU Youbing, XU Qiujin, PANG Yan, LI Dongyang, LI Qi. Removal characteristics of pollutants by riverine natural wetland in prairie region[J]. Journal of Environmental Engineering Technology, 2019, 9(2): 181-187. doi: 10.12153/j.issn.1674-991X.2018.12.290
shu

Removal characteristics of pollutants by riverine natural wetland in prairie region

doi: 10.12153/j.issn.1674-991X.2018.12.290

  • 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China

  • 2. State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China

  • 3. College of Water Science, Beijing Normal University, Beijing 100875, China

  • 4. Huaneng Energy Development Co., Ltd. In Gansu, Lanzhou 730070, China

  • Received Date: 2018-09-07
  • Publish Date: 2019-03-20
    Abstract
  • In order to clarify the removal effects of total phosphorus (TP), total nitrogen (TN) and chemical oxygen demand (COD) in river-type natural wetlands in the grassland, the Hailaer River wetland was studied. The changes of TP, TN and COD in the inlet (Taohai section) and the outlet (Cuogang section) during 2010-2015 were analyzed. The removal effects of TP, TN and COD in wetlands in different months were analyzed, and the mechanism of pollutant removal was discussed. The results showed that the coefficients of variation of TP, TN and COD in the Taohai section were 0.51, 0.73 and 0.39, respectively, and in the Cuogang section were reduced to 0.36, 0.43 and 0.38. The removal rates of TP, TN and COD in Hailaer River wetland were 26.67%, 20.90% and 8.74%, respectively. At present, the load of TP, TN and COD in wetland inflow had not exceeded their purification capacity. During the snowmelt period (May) and summer rain period (August to September), the wetland had lower removal of TP and TN . During the weak surface runoff period (January to March, October to December), the TP, TN and COD were highly removed. The removal of TP by wetland was mainly by bio-assimilation and soil adsorption during ice-thaw period, and by soil adsorption and precipitation during freezing period. The removal of TN by wetland was mainly by nitrification and denitrification and biological assimilation in ice-melting period, followed by sediment adsorption and biological assimilation in freezing period. The removal of COD in wetlands was mainly due to microbial degradation and soil adsorption.

     

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