Journal of East China Normal University(Natural Sc ›› 2018, Vol. 2018 ›› Issue (6): 50-58,121.doi: 10.3969/j.issn.1000-5641.2018.06.006

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Performance and factors of phosphorus interception in storing multi-pond wetlands in the Erhai Lake Basin

LI Dan1,2,3, HUANG Min-sheng1,2, ZHENG Bing-hui3, CHU Zhao-sheng3   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
    2. Institute of Eco-Chongming, East China Normal University, Shanghai 200241, China;
    3. Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • Received:2018-03-14 Online:2018-11-25 Published:2018-12-01

Abstract: To investigate the characteristics and factors of phosphorus interception, phosphorus concentration from 12 storing multi-pond wetlands were analyzed. Evaluation of the removal efficiency and identification of the key factors of phosphorus removal were executed in the Erhai Lake Basin. The results showed that the water quality was effectively improved because phosphorus pollutants from the surface source pollution were intercepted in the storing multi-pond wetlands. The average interception efficiency value of η(PO43--P), η(TP) and η(SS) were 43.44%~93.88%、27.71%~89.67% and 21.84%~62.12%, respectively. Both the phosphorus concentration of the influent and the efficiency of phosphorus interception in the dry season were higher, respectively, than those in the wet season. Intermittent outflow of effluent provided a residence time which was long enough for the removal of pollutants in the dry season. While ρo(TP) had a significantly positive correlation with ρi(PO43--P) (R=0.297) and ρi(TP) (R=0.304). η(TP) showed a significant positive correlation with ρi(PO43--P) (R=0.665) and ρi(TP) (R=0.740). The efficiency of phosphorus removal primarily depended on the proportion of phosphate and the TP concentration of the influent. This study may provide support as an engineering case of multi-pond wetlands for the reduction of phosphorus into lakes, water pollution control in basins, and water restoration.

Key words: storing multi-pond wetlands, phosphorus, interception, basin

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