Comprehensive analysis of step-feeding strategy to enhance biological nitrogen removal in alum sludge-based tidal flow constructed wetlands
|Title:||Comprehensive analysis of step-feeding strategy to enhance biological nitrogen removal in alum sludge-based tidal flow constructed wetlands||Authors:||Hu, Y.S.
|Permanent link:||http://hdl.handle.net/10197/4021||Date:||May-2012||Abstract:||Step-feeding strategies have been extensively studied and comprehensively analyzed in this study for a four-stage alum sludge-based tidal flow constructed wetlands (AlS-TFCWs) system. Enhanced total nitrogen removal of 83% is achieved under high nitrogen loading rate of 19.1 g N/m2 d. The key issues towards the success of a significant nitrogen removal in step-feeding TFCWs are the bed resting time (which provides better aeration for nitrification) and up flow stage/delayed input of side stream(s) (which ensure favorable environment for better denitrification). Simultaneous nitrification and denitrification (SND) was found effective in the 1st stage of the system and SND via nitrite is the main nitrogen conversion mechanism. The optimal influent distribution fraction for step-feeding purpose can be estimated from a theoretical basis, which is a function of the influent BCOD/TKN ratio. Therefore the influent distribution fraction should be adjusted according to the variety of influent characteristics, rather than a fixed value.||Type of material:||Journal Article||Publisher:||Elsevier||Copyright (published version):||2012 Elsevier Ltd||Keywords:||Alum sludge;Partial nitrification;Simultaneous nitrification and denitrification (SND);Step-feeding;Tidal flow constructed wetlands||DOI:||10.1016/j.biortech.2012.01.165||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Centre for Water Resources Research Collection|
Civil Engineering Research Collection
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