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

Abstract:

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.

• Periodical: Applied Mechanics and Materials (Volumes 522-524)
• Pages: 609-614
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.522-524.609
• Online since: February 2014
• Authors: Xue Cen Yu, Ming Xiao Zhang, Yue Wen*, Qi Zhou
• Keywords: Ammonia Nitrogen Removal, Horizontal Subsurface-Flow Constructed Wetlands, Substrate, Temperature, Vegetation

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