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Spatial Variation of Longitudinal Dispersion in LECA-Based Vegetated Beds

2012Journal article Open access
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dc.contributor.authorAlbuquerque, Antonio
dc.date.accessioned2014-06-30T17:59:00Z
dc.date.available2014-06-30T17:59:00Z
dc.date.issued2012
dc.description.abstractThe evaluation of the dispersion in vegetated beds may allow indentifying mechanisms that affect the transport and reaction of solutes, namely organic and nitrogen compounds. A set of non-reactive tracer experiments (slag injection) was performed in a vegetated bed (a mesocosm with a LECA-based substratum and colonized with Phragmites australis) used for the removal of organic and nitrogen pollutant loads. Loads of approximately 300 mg COD/L and 30 mg NH4-N/L and a hydraulic loading rate of 3.5 cm/d were used. The results showed a delay in all the residence time distribution (RTD) curves and a variation in the dimensionless residence time (mu((m,theta))) of the E(theta) curves, which means that the mass centre of the impulse was late relatively to the expected one. A strong dispersion and tracer retention (due to the presence of stagnated areas and internal recirculation) was observed, especially in the first 33 cm of the bed, which seems to have been related to the presence of complex clusters of roots, solid material, biofilm and LECA particles. An analytical solution of the Multiple-Tanks-in-Series (MTS) model well represents the RTD curves obtained in the tracer experiments. The detected dispersion and dead volume ratios (7% to 12%) did not affect the performance of the bed, which presented mean removal efficiencies of 85% and 60.4% for COD and NH4-N, respectively.por
dc.identifier.issn1012-0386
dc.identifier.urihttp://hdl.handle.net/10400.6/1962
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherTRANS TECH PUBLICATIONS LTDpor
dc.relationEVAWET - Evaluation of the hydrodynamic and environmental behaviour of constructed wetlands for wastewater treatment and reuse
dc.subjectWetlandspor
dc.subjectMacrófitaspor
dc.subjectDifusionpor
dc.subjectDead volumespor
dc.subjectHidrodinamicapor
dc.subjectHydrodinamicspor
dc.subjectDispersionpor
dc.subjectDispersãopor
dc.subjectTracer experimentspor
dc.subjectEnsaios de traçagempor
dc.subjectVegetated bedspor
dc.subjectFlow constructed wetlandspor
dc.subjectNutrient removalpor
dc.subjectRemoção de azotopor
dc.titleSpatial Variation of Longitudinal Dispersion in LECA-Based Vegetated Bedspor
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEVAWET - Evaluation of the hydrodynamic and environmental behaviour of constructed wetlands for wastewater treatment and reuse
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAMB%2F73081%2F2006/PT
oaire.citation.endPage284por
oaire.citation.startPage279por
oaire.citation.titleDefect and Diffusion Forumpor
oaire.citation.volume326-328por
oaire.fundingStream5876-PPCDTI
person.familyNameCarvalho de Albuquerque
person.givenNameAntonio João
person.identifier1284649
person.identifier.ciencia-id3319-F1FE-0DA8
person.identifier.orcid0000-0001-7099-0685
person.identifier.ridC-9293-2009
person.identifier.scopus-author-id8892509700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication9f533b0c-b538-4535-ade3-823df5592b88
relation.isAuthorOfPublication.latestForDiscovery9f533b0c-b538-4535-ade3-823df5592b88
relation.isProjectOfPublication084f409f-3f61-498c-b277-45d57991bef7
relation.isProjectOfPublication.latestForDiscovery084f409f-3f61-498c-b277-45d57991bef7

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