The role of concentrations gradients on phosphorus and iron dynamics from chemically-dosed horizontal flow wetlands for tertiary sewage treatment

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dc.contributor.authorBarak, Jan
dc.contributor.authorDotro, Gabriela
dc.contributor.authorJefferson, Bruce
dc.date.accessioned2019-07-23T11:01:05Z
dc.date.available2019-07-23T11:01:05Z
dc.date.issued2019-06-24
dc.description.abstractThis study examined the dynamics of iron (Fe) and phosphorus (P) transformations from the surface sludge accumulated in tertiary horizontal flow (HF) treatment wetlands (TW) chemically dosed for P removal. Site surveys showed P was stored in HF TW with and without artificial aeration on average, with instances of P release in the non-aerated site. Controlled experiments revealed storing TW surface sludge for over 24 hours resulted in limited oxygen and nitrate concentrations, resulting in both P and Fe release. The rate of P release increased with increasing water-sludge P concentration gradients, and the reaction could take as little as 10 minutes. Convection had no impact on P transformation rates. The findings suggest mitigation strategies could include the manipulation of the biogeochemical environment by managing oxygen and nitrate concentrations within the wetlands. A better understanding of links between Fe, P, and nitrate is needed to test proactive mitigation strategies for small wastewater treatment plants.en_UK
dc.identifier.citationBarak J, Dotro G, Jefferson B. (2019) The role of concentrations gradients on phosphorus and iron dynamics from chemically-dosed horizontal flow wetlands for tertiary sewage treatment. Water Science and Technology, Volume 79, Issue 11, 2019, pp. 2126-2134en_UK
dc.identifier.cris23896958
dc.identifier.issn0273-1223
dc.identifier.urihttps://doi.org/10.2166/wst.2019.215
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14379
dc.language.isoenen_UK
dc.publisherIWA Publishingen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectaerated wetlandsen_UK
dc.subjectdiffusionen_UK
dc.subjectnitrateen_UK
dc.subjectreed bedsen_UK
dc.subjectwastewateren_UK
dc.titleThe role of concentrations gradients on phosphorus and iron dynamics from chemically-dosed horizontal flow wetlands for tertiary sewage treatmenten_UK
dc.typeArticleen_UK

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