Evaluation of the hydrological flow paths in a gravel bed filter modeling a horizontal subsurface flow wetland by using a multi-tracer experiment.
    
    
        
    
    
        
        Sci. Total Environ. 621, 265-272 (2018)
    
    
    
		
		
			
				In recent years, constructed wetland systems have become into focus as means of cost-efficient organic contaminant management. Wetland systems provide a highly reactive environment in which several removal pathways of organic chemicals may be present at the same time; however, specific elimination processes and hydraulic conditions are usually separately investigated and thus not fully understood. The flow system in a three dimensional pilot-scale horizontal subsurface constructed wetland was investigated applying a multi-tracer test combined with a mathematical model to evaluate the flow and transport processes. The results indicate the existence of a multiple flow system with two distinct flow paths through the gravel bed and a preferential flow at the bottom transporting 68% of tracer mass resulting from the inflow design of the model wetland system. There the removal of main contaminant chlorobenzene was up to 52% based on different calculation approaches. Determined retention times in the range of 22 d to 32.5 d the wetland has a heterogeneous flow pattern. Differences between simulated and measured tracer concentrations in the upper sediment indicate diffusion dominated processes due to stagnant water zones. The tracer study combining experimental evaluation with mathematical modeling demonstrated the complexity of flow and transport processes in the constructed wetlands which need to be taken into account during interpretation of the determining attenuation processes. (C) 2017 Elsevier B.V. All rights reserved.
			
			
				
			
		 
		
			
				
					
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        Publikationstyp
        Artikel: Journalartikel
    
 
    
        Dokumenttyp
        Wissenschaftlicher Artikel
    
 
    
        Typ der Hochschulschrift
        
    
 
    
        Herausgeber
        
    
    
        Schlagwörter
        Constructed Wetland ; Multi Tracer Test ; Mathematical Modeling ; Chlorobenzene; Personal Care Products; Constructed Wetlands; Fluorescent Dyes; Contaminated Groundwater; Water; Pharmaceuticals; Biodegradation; Bromide; Removal; Systems
    
 
    
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        Sprache
        englisch
    
 
    
        Veröffentlichungsjahr
        2018
    
 
    
        Prepublished im Jahr 
        2017
    
 
    
        HGF-Berichtsjahr
        2017
    
 
    
    
        ISSN (print) / ISBN
        0048-9697
    
 
    
        e-ISSN
        1879-1026
    
 
    
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	    Band: 621,  
	    Heft: ,  
	    Seiten: 265-272 
	    Artikelnummer: ,  
	    Supplement: ,  
	
    
 
  
        
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            Verlag
            Elsevier
        
 
        
            Verlagsort
            Amsterdam
        
 
	
        
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        Begutachtungsstatus
        Peer reviewed
    
 
     
    
        POF Topic(s)
        20403 - Sustainable Water Management
    
 
    
        Forschungsfeld(er)
        Environmental Sciences
    
 
    
        PSP-Element(e)
        G-504300-001
    
 
    
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        Erfassungsdatum
        2018-01-08