Abstract
This work was aimed at investigating the feasibility of the slope wetland system (SWs) for improving the polluted river water. According to the characteristics of polluted river water with different hydraulic retention time (HRT) changes, a field simulation device was set up. In this experiment, a SWs simulation device was set up to study pollutant removal of SWs under different hydraulic conditions. It was found that the effect of mixed fillers (zeolite and ceramsite) as the bed was better than that of the gravel fillers as the bed. The improvement of each treatment index was about 5% (P < 0.05). When HRT = 5 days, the removal rate of chemical oxygen demand (COD) was 28.02%, total nitrogen (TN) was 32.99%, ammonia nitrogen (NH3-N) was 32.49%, and total phosphorus (TP) was 38.15%. At the same time, it was found that the characteristic moderate extension of HRT is conducive to the removal of pollutants in SWs. The growth of plants in the environment of the gravel matrix was worse than that of mixed fillers (zeolite and ceramsite). It was found that physical adsorption was the main form of pollution removal on the SWs fillers by Fourier infrared spectrum (FTIR) analysis. Based on the analysis of the microbial community in the packing of the device, it is indicated that the enrichment of microorganisms appeared during the experiment, forming the dominant bacteria against the polluted river water.
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Funding
This work was supported by the Research and Demonstration on Key Technologies of Urban Landscape River Water System Connection and Typical Black and Stinky River Treatment in Northern Area (2017ZX07103-001).
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Jia Wang: Validation, formal analysis, visualization, software, data curation
Yonggang Gu: Conceptualization, methodology, software, investigation, writing—original draft
Hao Wang: Validation, formal analysis, visualization
Zhaoxin Li: Resources, writing—review and editing, supervision
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Wang, J., Gu, Y., Wang, H. et al. Investigation on the treatment effect of slope wetland on pollutants under different hydraulic retention times. Environ Sci Pollut Res 28, 9107–9119 (2021). https://doi.org/10.1007/s11356-020-11292-z
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DOI: https://doi.org/10.1007/s11356-020-11292-z