Modelling Nitrogen Removal in a Coupled HRP and Unplanted Horizontal Flow Subsurface Gravel Bed Constructed Wetland

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dc.contributor.authorMayo, Aloyce W.
dc.contributor.authorMutamba, Jeremiah
dc.date.accessioned2016-05-24T10:19:28Z
dc.date.available2016-05-24T10:19:28Z
dc.date.issued2005
dc.descriptionFull text can be accessed at http://www.sciencedirect.com/science/article/pii/S1474706505000781en_US
dc.description.abstractA coupled model was developed that incorporates all the major nitrogen transformation mechanisms influencing nitrogen removal in aquatic systems. The model simulates nitrogen transformation and removal processes in the high rate pond (HRP) and the subsurface constructed wetland unit (SSCW). The model considered organic nitrogen (ON), ammonia nitrogen (NH3-N), and nitrate nitrogen (View the MathML source) as the major forms of nitrogen involved in the transformation chains. The influencing transformation mechanisms considered in the model include uptake of inorganic nitrogen by algae and bacteria, mineralization, sedimentation, volatilisation of ammonia and nitrification coupled with denitrification processes. The results showed that improved nitrogen removal occurred with increase in hydraulic time of the HRP unit. It was also revealed that the HRP can effectively be used to promote nitrification and subsurface flow gravel bed constructed wetland can be used as a denitrifying unit. The most efficient mechanisms were determined using a transformation model. The model indicated that nitrification and mineralization were dominant contributing 51.1% and 14.9%, respectively. Denitrification and mineralization were most significant in the SSCW accounting for 43.5% and 16.7%, respectively. Nitrification–denitrification route was observed to be the most significant mechanism for nitrogen removal in the coupled system with an overall contribution of 53%. The model predicted the overall nitrogen removal as 37% compared to 38.4% obtained from field measurements.en_US
dc.identifier.citationMayo, A.W. and Mutamba, J., 2005. Modelling nitrogen removal in a coupled HRP and unplanted horizontal flow subsurface gravel bed constructed wetland. Physics and Chemistry of the Earth, Parts A/B/C, 30(11), pp.673-679.en_US
dc.identifier.doi10.1016/j.pce.2005.08.007
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2224
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectModellingen_US
dc.subjectBiofilmen_US
dc.subjectNitrificationen_US
dc.subjectDenitrificationen_US
dc.subjectSedimentationen_US
dc.subjectMineralizationen_US
dc.titleModelling Nitrogen Removal in a Coupled HRP and Unplanted Horizontal Flow Subsurface Gravel Bed Constructed Wetlanden_US
dc.typeJournal Articleen_US
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