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Large-scale hybrid accidental urban wetland for polluted river purification in northern China: Evidence and implications for urban river management
Kumwimba, Mathieu Nsenga; Li, Xinzhu; Wang, Wei; De Silva, L. H. D. K. U.; Bao, Linlin; Mihiranga, H. K. M.; Su, Jingjun; Li, Xuyong
2021-5-
Source PublicationENVIRONMENTAL TECHNOLOGY & INNOVATION
ISSN2352-1864
Volume22Pages:-
AbstractHybrid accidental urban wetlands (HAUWs) are expected to be a potential low-cost and highly efficient alternative means of minimizing pollutant loads from municipal areas as compared to the single-stage system being used. These unexpected HAUWs are created not through deliberate restoration, but as a result of water infrastructure decisions by local government. However, information on the long-term purification efficiency of large-scale HAUW improving eutrophic urban rivers is largely unexplored. An in-situ HAUW system consisting of a rubber dam, detention pond, accidental urban wetland, and overflow weir was evaluated at the field-scale for the purification of a eutrophic urban river in Zhangjiakou City, Hebei Province. The results for seven months of operation demonstrated that the effluent TP and NH4-N in the HAUW system could comply with the Grade III of Chinese National Surface Water Quality Standards. Average removal efficiencies for TN, NH4-N, NO3-N, TP, and PO4-P in the summer-autumn period of 52.6, 65,8, 56.6, 51.4, 58.2 and 88.3%, respectively, were recorded. These removal efficiencies were 59.4, 61.5, 65.6, 57.1, 59.4 and 65.7% higher than the respective values in the spring period. Furthermore, removal rates of nutrients were highly sensitive to temperature and showed seasonal trends. Further analysis showed that, with the application of the HAUW system, a total of 92.1, 69.5, 57.3, 37.8, 33.2, 12.4, 14.5, 7.3, 3.4% removal of Al, Mn, Cd, Pb, Zn, Ni, Fe, Ni, and As was achieved. Mean removal rates of TN, NH4-N, NO3N, TP, TDP, PO4-P in the summer-autumn period were 2- 5 times higher than in those recorded in the early spring period. These results suggest that a variety of contaminant elimination mechanisms were offered by the HAUW, including enhanced hydraulic resistance, sedimentation, plant assimilation, microbial biofilm growth on roots' surface and the HAUW design. Overall, this study demonstrated that the monitored HAUW could be another feature of the urban landscape that could help minimize pollutant loading to surface urban water bodies. This function is especially true in warm periods, in a similar way as natural wetlands or purposely built constructed wetlands. Nonetheless, managing these accidental treatment systems to maximize pollutant dissipation in the long-term would necessitate appropriate management strategies. (C) 2021 Elsevier B.V. All rights reserved.
Department城市与区域生态国家重点实验室
KeywordUnexpected integrated urban systems Nutrient and metal removal Purification efficiency Eutrophic river Water quality
WOS Research AreaBiotechnology & Applied Microbiology ; Engineering, Environmental ; Environmental Sciences
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/45500
Collection城市与区域生态国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Lubumbashi, Fac Agron, Lubumbashi, DEM REP CONGO
4.Capital Normal Univ, Coll Resource Environm & Tourism, Beijing 100048, Peoples R China
Recommended Citation
GB/T 7714
Kumwimba, Mathieu Nsenga,Li, Xinzhu,Wang, Wei,et al. Large-scale hybrid accidental urban wetland for polluted river purification in northern China: Evidence and implications for urban river management[J]. ENVIRONMENTAL TECHNOLOGY & INNOVATION,2021,22:-.
APA Kumwimba, Mathieu Nsenga.,Li, Xinzhu.,Wang, Wei.,De Silva, L. H. D. K. U..,Bao, Linlin.,...&Li, Xuyong.(2021).Large-scale hybrid accidental urban wetland for polluted river purification in northern China: Evidence and implications for urban river management.ENVIRONMENTAL TECHNOLOGY & INNOVATION,22,-.
MLA Kumwimba, Mathieu Nsenga,et al."Large-scale hybrid accidental urban wetland for polluted river purification in northern China: Evidence and implications for urban river management".ENVIRONMENTAL TECHNOLOGY & INNOVATION 22(2021):-.
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