DOI: 10.5194/hess-20-109-2016
Scopus记录号: 2-s2.0-84956987765
论文题名: Carbon and nitrogen dynamics and greenhouse gas emissions in constructed wetlands treating wastewater: A review
作者: Jahangir M ; M ; R ; , Richards K ; G ; , Healy M ; G ; , Gill L ; , Müller C ; , Johnston P ; , Fenton O
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 1 起始页码: 109
结束页码: 123
语种: 英语
Scopus关键词: Carbon dioxide
; Denitrification
; Dynamics
; Environmental management
; Gas emissions
; Greenhouse gases
; Nitrogen
; Nitrogen oxides
; Nutrients
; Pollution
; Turbines
; Vegetation
; Wastewater treatment
; Wetlands
; Biogeochemical dynamics
; Constructed wetlands
; Constructed wetlands (CWs)
; Environmental performance
; Hydraulic loading rates
; Hydraulic retention time
; Management practices
; Removal efficiencies
; Nitrogen removal
; ammonium
; biogeochemistry
; carbon
; carbon dioxide
; constructed wetland
; denitrification
; efficiency measurement
; emission inventory
; environmental fate
; greenhouse gas
; methane
; nitrate
; nitrogen
; nitrous oxide
; pollutant removal
; subsurface flow
; vegetation type
; wastewater
; water treatment
英文摘要: The removal efficiency of carbon (C) and nitrogen (N) in constructed wetlands (CWs) is very inconsistent and frequently does not reveal whether the removal processes are due to physical attenuation or whether the different species have been transformed to other reactive forms. Previous research on nutrient removal in CWs did not consider the dynamics of pollution swappin (the increase of one pollutant as a result of a measure introduced to reduce a different pollutant) driven by transformational processes within and around the system. This paper aims to address this knowledge gap by reviewing the biogeochemical dynamics and fate of C and N in CWs and their potential impact on the environment, and by presenting novel ways in which these knowledge gaps may be eliminated. Nutrient removal in CWs varies with the type of CW, vegetation, climate, season, geographical region, and management practices. Horizontal flow CWs tend to have good nitrate (NO3 -) removal, as they provide good conditions for denitrification, but cannot remove ammonium (NH4 +) due to limited ability to nitrify NH4 +. Vertical flow CWs have good NH4 + removal, but their denitrification ability is low. Surface flow CWs decrease nitrous oxide (N2O) emissions but increase methane (CH4) emissions; subsurface flow CWs increase N2O and carbon dioxide (CO2) emissions, but decrease CH4 emissions. Mixed species of vegetation perform better than monocultures in increasing C and N removal and decreasing greenhouse gas (GHG) emissions, but empirical evidence is still scarce. Lower hydraulic loadings with higher hydraulic retention times enhance nutrient removal, but more empirical evidence is required to determine an optimum design. A conceptual model highlighting the current state of knowledge is presented and experimental work that should be undertaken to address knowledge gaps across CWs, vegetation and wastewater types, hydraulic loading rates and regimes, and retention times, is suggested. We recommend that further research on process-based C and N removal and on the balancing of end products into reactive and benign forms is critical to the assessment of the environmental performance of CWs. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78940
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil, Structural and Environmental Engineering, Trinity College Dublin, Dublin, Ireland; Department of Environment, Soils and Land Use, Teagasc Environment Research Centre, Johnstown Castle, Co. Wexford, Ireland; Civil Engineering, National University of Ireland, Galway, Co. Galway, Ireland; School of Biology and Environmental Science, University College Dublin, Belfield, Dublin, Ireland; Department of Plant Ecology (IFZ), Justus-Liebig University Giessen, Giessen, Germany
Recommended Citation:
Jahangir M,M,R,et al. Carbon and nitrogen dynamics and greenhouse gas emissions in constructed wetlands treating wastewater: A review[J]. Hydrology and Earth System Sciences,2016-01-01,20(1)