Investigation on the treatment effect of slope wetland on pollutants under different hydraulic retention times
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RESEARCH ARTICLE
Investigation on the treatment effect of slope wetland on pollutants under different hydraulic retention times Jia Wang 1,2 & Yonggang Gu 1 & Hao Wang 2 & Zhaoxin Li 1 Received: 17 June 2020 / Accepted: 18 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
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. Keywords Polluted river water . Slope wetland . Pollutant removal . FTIR analysis . Microbial community
Introduction In recent years, with the rapid development of the urban economy, there are more and more problems such as air pollution and water environment damage caused by an extensive economy (Abedi and Mojiri 2019; Zhang et al. 2019). In the process of urban construction, the original ecological environment happens continuously (Wang et al. 2020b). The smallscale river channel in the urban water environment system is an important landform connecting the river network (Rice Responsible Editor: Alexandros Stefanakis * Yonggang Gu [email protected] * Hao Wang [email protected] 1
Department of Institute of Water Environment, Beijing Institute of Water Science and Technology, Beijing 100048, China
2
College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan 063009, China
2017). However, actual urban rivers faced the threat of pollution as usual, and the polluted rivers not only have peculiar smells but also may cause harm to the surrounding residents (Dzakpasu et al. 2015; Wang et al. 2020a). The water quality and ecological environmental health of rivers and lakes are closely related to people’s production and life, the variation on rivers bring hidden risks to inhabit
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