Silica removal in industrial effluents with high silica content and low hardness

High silica content of paper mill effluents is limiting their regeneration and reuse after membrane treatments such as reverse osmosis (RO). Silica removal during softening processes is a common treatment; however, the effluent from the paper mill studied has a low hardness content which makes neces...

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Detalles Bibliográficos
Autores: Latour, Isabel, Miranda Carreño, Rubén, Blanco Suárez, María Ángeles
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/33920
Acceso en línea:https://hdl.handle.net/20.500.14352/33920
Access Level:acceso abierto
Palabra clave:676
66.0
Silica removal
Magnesium
Softening
Co-precipitation
Membranes fouling
Effluent reuse
Paper recycling
Industria del papel
Ingeniería química
Residuos
3312.13 Tecnología de la Madera
3303 Ingeniería y Tecnología Químicas
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oai_identifier_str oai:docta.ucm.es:20.500.14352/33920
network_acronym_str ES
network_name_str España
repository_id_str
spelling Silica removal in industrial effluents with high silica content and low hardnessLatour, IsabelMiranda Carreño, RubénBlanco Suárez, María Ángeles67666.0Silica removalMagnesiumSofteningCo-precipitationMembranes foulingEffluent reusePaper recyclingIndustria del papelIngeniería químicaResiduos3312.13 Tecnología de la Madera3303 Ingeniería y Tecnología QuímicasHigh silica content of paper mill effluents is limiting their regeneration and reuse after membrane treatments such as reverse osmosis (RO). Silica removal during softening processes is a common treatment; however, the effluent from the paper mill studied has a low hardness content which makes necessary the addition of magnesium compounds to increase silica removal. Two soluble magnesium compounds (MgCl2∙6H2O and MgSO4∙7H2O) were tested at five dosages (250-1500 mg/L) and different initial pHs. High removal rates (80-90%) were obtained with both products at the highest pH tested (11.5). With these removal efficiencies, it is possible to work at high RO recoveries (75-85%) without silica scaling. Although pH regulation significantly increased the conductivity of the waters (at pH 11.5 from 2.1 mS/cm to 3.7-4.0 mS/cm), this could be partially solved by using Ca(OH)2 instead of NaOH as pH regulator (final conductivity around 3.0 mS/cm). Maximum chemical oxygen demand (COD) removal obtained with caustic soda was lower than with lime (15% vs. 30%). Additionally, the combined use of a polyaluminum coagulant during the softening process was studied; the coagulant, however, did not significantly improve silica removal, obtaining a maximum increase of only 10%.SpringerUniversidad Complutense de Madrid20142014-01-0120142014-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/33920reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/339202026-06-02T12:44:21Z
dc.title.none.fl_str_mv Silica removal in industrial effluents with high silica content and low hardness
title Silica removal in industrial effluents with high silica content and low hardness
spellingShingle Silica removal in industrial effluents with high silica content and low hardness
Latour, Isabel
676
66.0
Silica removal
Magnesium
Softening
Co-precipitation
Membranes fouling
Effluent reuse
Paper recycling
Industria del papel
Ingeniería química
Residuos
3312.13 Tecnología de la Madera
3303 Ingeniería y Tecnología Químicas
title_short Silica removal in industrial effluents with high silica content and low hardness
title_full Silica removal in industrial effluents with high silica content and low hardness
title_fullStr Silica removal in industrial effluents with high silica content and low hardness
title_full_unstemmed Silica removal in industrial effluents with high silica content and low hardness
title_sort Silica removal in industrial effluents with high silica content and low hardness
dc.creator.none.fl_str_mv Latour, Isabel
Miranda Carreño, Rubén
Blanco Suárez, María Ángeles
author Latour, Isabel
author_facet Latour, Isabel
Miranda Carreño, Rubén
Blanco Suárez, María Ángeles
author_role author
author2 Miranda Carreño, Rubén
Blanco Suárez, María Ángeles
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 676
66.0
Silica removal
Magnesium
Softening
Co-precipitation
Membranes fouling
Effluent reuse
Paper recycling
Industria del papel
Ingeniería química
Residuos
3312.13 Tecnología de la Madera
3303 Ingeniería y Tecnología Químicas
topic 676
66.0
Silica removal
Magnesium
Softening
Co-precipitation
Membranes fouling
Effluent reuse
Paper recycling
Industria del papel
Ingeniería química
Residuos
3312.13 Tecnología de la Madera
3303 Ingeniería y Tecnología Químicas
description High silica content of paper mill effluents is limiting their regeneration and reuse after membrane treatments such as reverse osmosis (RO). Silica removal during softening processes is a common treatment; however, the effluent from the paper mill studied has a low hardness content which makes necessary the addition of magnesium compounds to increase silica removal. Two soluble magnesium compounds (MgCl2∙6H2O and MgSO4∙7H2O) were tested at five dosages (250-1500 mg/L) and different initial pHs. High removal rates (80-90%) were obtained with both products at the highest pH tested (11.5). With these removal efficiencies, it is possible to work at high RO recoveries (75-85%) without silica scaling. Although pH regulation significantly increased the conductivity of the waters (at pH 11.5 from 2.1 mS/cm to 3.7-4.0 mS/cm), this could be partially solved by using Ca(OH)2 instead of NaOH as pH regulator (final conductivity around 3.0 mS/cm). Maximum chemical oxygen demand (COD) removal obtained with caustic soda was lower than with lime (15% vs. 30%). Additionally, the combined use of a polyaluminum coagulant during the softening process was studied; the coagulant, however, did not significantly improve silica removal, obtaining a maximum increase of only 10%.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-01-01
2014
2014-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/33920
url https://hdl.handle.net/20.500.14352/33920
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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