Effect of temperature, HRT, vegetation and porous media on removal efficiency of pilot-scale horizontal subsurface flow constructed wetlands

2007 ◽  
Vol 29 (2) ◽  
pp. 173-191 ◽  
Author(s):  
Christos S. Akratos ◽  
Vassilios A. Tsihrintzis
Keyword(s):  
Porous Media ◽  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Subsurface Flow ◽  
Pilot Scale ◽  
Effect Of Temperature ◽  
Horizontal Subsurface Flow ◽  
Subsurface Flow Constructed Wetlands

The Effect of Temperature and Loading Rate on the Ammonia Nitrogen Removal in Horizontal Subsurface-Flow Constructed Wetlands with Different Vegetation and Substrate

2014 ◽  
Vol 522-524 ◽  
pp. 609-614
Author(s):  
Xue Cen Yu ◽  
Ming Xiao Zhang ◽  
Yue Wen ◽  
Qi Zhou
Keyword(s):  
Constructed Wetlands ◽  
Subsurface Flow ◽  
Ammonia Nitrogen ◽  
Effect Of Temperature ◽  
Polluted Water ◽  
Removal Rates ◽  
Gravel Bed ◽  
N Removal ◽  
Horizontal Subsurface Flow ◽  
Subsurface Flow Constructed Wetlands

The removal of ammonia nitrogen from the polluted water was investigated in three different types of horizontal subsurface flow constructed wetlands, reed (Phragmites australis)/gravel bed (W1), hybrid vegetation {reed, cattail (Typha latifolia), bulrush (Scirpus validus)}/gravel bed (W2) and reed/hybrid substrates (gravel, zeolite, slag) bed (W3). At HRT of 28 d, NH3-N removal efficiencies of W1, W2 and W3 were-130%98%, -120%98% and 21%98% respectively throughout the whole year. The results showed that zeolite and slag contributed to higher NH3-N removal than gravel, especially in winter, and that cattail and bulrush did not show significant influences on NH3-N removal. The ranges of NH3-N removal rates were-2.332.14, -2.272.33 and 0.082.52 g·m-3·d-1 respectively under HRT of 2 d. NH3-N removal rates of W1 and W2 were much more affected by temperature than that of W3, which was due to the adsorption/desorption of zeolite.

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