Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems

Food industries contribute significantly to the pollution of water streams. Oil in wastewaters must be removed to prevent fouling of process equipment, to reduce interference with subsequent water-treatment units, and to comply with water-discharge requirements. Polyelectrolytes are frequently used...

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Detalles Bibliográficos
Autores principales: Pinotti, Adriana Noemí, Bevilacqua, Alicia Eva, Zaritzky, Noemí Elisabet
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Química
Chitosan
Emulsions
Flocculation
Polyacrylamide
Polyelectrolytes
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/138731
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-138731
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Chitosan
Emulsions
Flocculation
Polyacrylamide
Polyelectrolytes
spellingShingle Química
Chitosan
Emulsions
Flocculation
Polyacrylamide
Polyelectrolytes
Pinotti, Adriana Noemí
Bevilacqua, Alicia Eva
Zaritzky, Noemí Elisabet
Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
topic_facet Química
Chitosan
Emulsions
Flocculation
Polyacrylamide
Polyelectrolytes
description Food industries contribute significantly to the pollution of water streams. Oil in wastewaters must be removed to prevent fouling of process equipment, to reduce interference with subsequent water-treatment units, and to comply with water-discharge requirements. Polyelectrolytes are frequently used to coagulate and flocculate colloidal systems. A model system of a sunflower oil/water emulsion was used to analyze the effect of: (i) emulsion droplet sizes, (ii) surfactant chain length (sodium dodecyl sulfate and sodium tetradecyl sulfate), (iii) ionic strength, and (iv) pH, on the doses of chitosan (natural cationic polyelectrolyte) and a cationic polyacrylamide, necessary to neutralize electrical charge and to get flocculation. Methods used were: turbidimetry, jar test, colloidal titration, and light microscopy observation. Results showed that the increase of NaCl concentration reduces the doses of chitosan and polyacrylamide to reach zero colloidal charge; these doses increase with the surfactant chain length. pH variation did not show any influence on the chitosan dose necessary to flocculate the system. Redispersion of the emulsion was observed in chitosan and polyacrylamide treatments.
format Articulo
Articulo
author Pinotti, Adriana Noemí
Bevilacqua, Alicia Eva
Zaritzky, Noemí Elisabet
author_facet Pinotti, Adriana Noemí
Bevilacqua, Alicia Eva
Zaritzky, Noemí Elisabet
author_sort Pinotti, Adriana Noemí
title Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
title_short Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
title_full Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
title_fullStr Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
title_full_unstemmed Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
title_sort comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/138731
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AT zaritzkynoemielisabet comparisonoftheperformanceofchitosanandacationicpolyacrylamideasflocculantsofemulsionsystems
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