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Optimization of a vermifiltration process for treating urban wastewater

2017-03Journal article Restricted access
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dc.contributor.authorLourenço, Nelson
dc.contributor.authorNunes, L.
dc.date.accessioned2019-11-20T15:07:47Z
dc.date.available2019-11-20T15:07:47Z
dc.date.issued2017-03
dc.description.abstractOptimization of a vermifiltration process was made for hydraulic retention time (HRT), hydraulic loading rate (HLR) and recirculation ratio (R), organic loading rate (OLR), earthworm abundance and reactor type on organic matter removal from urban wastewater using a small-scale vermifiltration process comprising single stage, and four-stage vermifilter (VF) systems. All reactor modules were made of PVC with a total volume of 25 L using vermicompost as the filtering material and quartz sand and gravel as the inert filter. System performance was assessed by the removal efficiencies of BOD5, tCOD, sCOD, pCOD, TSS and NH4+. In the earthworm study, four abundances were evaluated: 10 g L-1 (W10), 20 g L-1 (W20), 30 g L-1 (W30) and 40 g L-1 (W40). In the four-stage VF the earthworm abundance evaluated was 20 g L-1. W20 proved to be the optimal treatment condition with efficiencies for BOD5, tCOD, pCOD, TSS and NH4+ of 97.5%, 74.3%, 91.1%, 98.2% and 88.1%, for a pCOD/tCOD ratio of 0.20. The four-stage sequential VF promoted a decrease of BOD5 (98.5%), tCOD (74.3%), pCOD (86.7%), TSS (96.6%), and NH4+ (99.1%). Results indicate that sequential VF systems can significantly improve treatment efficiencies when compared to single stage VF. (C) 2016 Elsevier B.V. All rights reserved.
dc.description.sponsorshipFUTURAMB(R)
dc.identifier.doi10.1016/j.ecoleng.2016.11.074
dc.identifier.issn0925-8574
dc.identifier.urihttp://hdl.handle.net/10400.1/13214
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science Bv
dc.subjectSewage treatment
dc.subjectEisenia-Foetida
dc.subjectSynchronous treatment
dc.subjectTreatment performance
dc.subjectLumbricus-terrestris
dc.subjectLoading rate
dc.subjectEarthworms
dc.subjectRemoval
dc.subjectGrowth
dc.subjectSludge
dc.titleOptimization of a vermifiltration process for treating urban wastewater
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage146
oaire.citation.startPage138
oaire.citation.titleEcological Engineering
oaire.citation.volume100
person.familyNameLourenço
person.familyNameNunes
person.givenNameNelson
person.givenNameLuís
person.identifier93800
person.identifier.ciencia-id3112-1FCD-6685
person.identifier.orcid0000-0001-5529-7401
person.identifier.orcid0000-0001-5606-970X
person.identifier.ridM-4647-2013
person.identifier.scopus-author-id7102529511
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationaa50934c-5ced-41ce-8396-f4b915452dc4
relation.isAuthorOfPublicationd32d0ac6-6cb6-4f03-afcf-3c80978d469f
relation.isAuthorOfPublication.latestForDiscoveryd32d0ac6-6cb6-4f03-afcf-3c80978d469f

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