Equilibrium of tropical waters : its consequences on the iron removal
Studies on calcium carbonate equilibrium of West African ground water, a sample of potable water distributed in Lomé (Togo), were carried out using the method described by LEGRAND and POIRIER. It is a standard graphic method in which calculations include all basic (Ca++, HCO3-, CO3--, CO2, H2O+, OH-...
Published in: | Revue des sciences de l'eau |
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Format: | Article in Journal/Newspaper |
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Consortium Erudit
2005
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Online Access: | http://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://doi.org/10.7202/705016ar https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar/ https://core.ac.uk/display/59609272 https://www.erudit.org/revue/rseau/1988/v1/n4/705016ar.html https://academic.microsoft.com/#/detail/242595594 https://id.erudit.org/iderudit/705016ar |
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fttriple:oai:gotriple.eu:50|dedup_wf_001::c4191e395f0d39b00de8afba06d103b2 2023-05-15T15:53:01+02:00 Equilibrium of tropical waters : its consequences on the iron removal Y. Boukari G. Matejka P. Simon B. Parinet 2005-04-12 http://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://doi.org/10.7202/705016ar https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar/ https://core.ac.uk/display/59609272 https://www.erudit.org/revue/rseau/1988/v1/n4/705016ar.html https://academic.microsoft.com/#/detail/242595594 https://id.erudit.org/iderudit/705016ar undefined unknown Consortium Erudit http://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf http://dx.doi.org/10.7202/705016ar https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar/ https://core.ac.uk/display/59609272 https://www.erudit.org/revue/rseau/1988/v1/n4/705016ar.html https://academic.microsoft.com/#/detail/242595594 https://id.erudit.org/iderudit/705016ar undefined 705016ar 10.7202/705016ar 242595594 oai:erudit.org:705016ar 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 10|issn___print::130cf49e979129942002da43f89d0654 10|openaire____::8ac8380272269217cb09a928c8caa993 10|openaire____::5f532a3fc4f1ea403f37070f59a7a53a 10|opendoar____::16e6a3326dd7d868cbc926602a61e4d0 Sciences Humaines et Sociales Social Sciences and Humanities Eaux souterraines tropicales eaux potables agressivité déferrisation Tropical underground waters drinking waters agressivity iron removal envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2005 fttriple https://doi.org/10.7202/705016ar 2023-01-22T17:16:39Z Studies on calcium carbonate equilibrium of West African ground water, a sample of potable water distributed in Lomé (Togo), were carried out using the method described by LEGRAND and POIRIER. It is a standard graphic method in which calculations include all basic (Ca++, HCO3-, CO3--, CO2, H2O+, OH-), and characteristic (Mg++, Na+, K+, SO4--, Cl- .) chemical parameters of natural water. Processing of a computer program for calculations enabled the equilibrium and saturation curve [CO2] = f[Ca++], to be obtained. The aggressivity to the lime deposit character, different conditions of treatment, aeration, and addition of an appropriate base to neutralise the nature aggressivity of water due to its high dissolved carbon dioxide content could also be defined.The problem of the presence of iron was studied; high concentration of iron in natural ground water lead to various problems : developing of tastes, staining and discoloration of clothes, and growth of iron bacteria in the distribution system. Its removal from water is accomplished by means of the oxidation of iron (II) to iron (III) followed by the precipitation of relatively insoluble ferric hydroxide. The oxidation rate is highly dependent on pH. Thus, the process of removal of carbon dioxide by stripping or neutralisation raises the pH of the water. If the pH is raised high enough, an insoluble form of iron will precipitate. Another important aspect of the chemical behaviour of iron is the formation of complex ions with inorganic as well as organic ligands; silica in water forms a relatively stable complex with iron (III). The difficulty in removing iron from water is often associated with this phenomenon.Continuous flow studies were carried out to improve important steps of treatment such as addition of a strong base, and precipitation and filtration of ferric hydroxide produced during carbonic acid neutralization. They show the weak stability of silicato-iron (III) complex at high pH value and prove that practically complete iron removal may be obtained. ... Article in Journal/Newspaper Carbonic acid Unknown Revue des sciences de l'eau 1 4 339 353 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
unknown |
topic |
Sciences Humaines et Sociales Social Sciences and Humanities Eaux souterraines tropicales eaux potables agressivité déferrisation Tropical underground waters drinking waters agressivity iron removal envir geo |
spellingShingle |
Sciences Humaines et Sociales Social Sciences and Humanities Eaux souterraines tropicales eaux potables agressivité déferrisation Tropical underground waters drinking waters agressivity iron removal envir geo Y. Boukari G. Matejka P. Simon B. Parinet Equilibrium of tropical waters : its consequences on the iron removal |
topic_facet |
Sciences Humaines et Sociales Social Sciences and Humanities Eaux souterraines tropicales eaux potables agressivité déferrisation Tropical underground waters drinking waters agressivity iron removal envir geo |
description |
Studies on calcium carbonate equilibrium of West African ground water, a sample of potable water distributed in Lomé (Togo), were carried out using the method described by LEGRAND and POIRIER. It is a standard graphic method in which calculations include all basic (Ca++, HCO3-, CO3--, CO2, H2O+, OH-), and characteristic (Mg++, Na+, K+, SO4--, Cl- .) chemical parameters of natural water. Processing of a computer program for calculations enabled the equilibrium and saturation curve [CO2] = f[Ca++], to be obtained. The aggressivity to the lime deposit character, different conditions of treatment, aeration, and addition of an appropriate base to neutralise the nature aggressivity of water due to its high dissolved carbon dioxide content could also be defined.The problem of the presence of iron was studied; high concentration of iron in natural ground water lead to various problems : developing of tastes, staining and discoloration of clothes, and growth of iron bacteria in the distribution system. Its removal from water is accomplished by means of the oxidation of iron (II) to iron (III) followed by the precipitation of relatively insoluble ferric hydroxide. The oxidation rate is highly dependent on pH. Thus, the process of removal of carbon dioxide by stripping or neutralisation raises the pH of the water. If the pH is raised high enough, an insoluble form of iron will precipitate. Another important aspect of the chemical behaviour of iron is the formation of complex ions with inorganic as well as organic ligands; silica in water forms a relatively stable complex with iron (III). The difficulty in removing iron from water is often associated with this phenomenon.Continuous flow studies were carried out to improve important steps of treatment such as addition of a strong base, and precipitation and filtration of ferric hydroxide produced during carbonic acid neutralization. They show the weak stability of silicato-iron (III) complex at high pH value and prove that practically complete iron removal may be obtained. ... |
format |
Article in Journal/Newspaper |
author |
Y. Boukari G. Matejka P. Simon B. Parinet |
author_facet |
Y. Boukari G. Matejka P. Simon B. Parinet |
author_sort |
Y. Boukari |
title |
Equilibrium of tropical waters : its consequences on the iron removal |
title_short |
Equilibrium of tropical waters : its consequences on the iron removal |
title_full |
Equilibrium of tropical waters : its consequences on the iron removal |
title_fullStr |
Equilibrium of tropical waters : its consequences on the iron removal |
title_full_unstemmed |
Equilibrium of tropical waters : its consequences on the iron removal |
title_sort |
equilibrium of tropical waters : its consequences on the iron removal |
publisher |
Consortium Erudit |
publishDate |
2005 |
url |
http://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://doi.org/10.7202/705016ar https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar/ https://core.ac.uk/display/59609272 https://www.erudit.org/revue/rseau/1988/v1/n4/705016ar.html https://academic.microsoft.com/#/detail/242595594 https://id.erudit.org/iderudit/705016ar |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
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http://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar.pdf http://dx.doi.org/10.7202/705016ar https://www.erudit.org/fr/revues/rseau/1988-v1-n4-rseau3252/705016ar/ https://core.ac.uk/display/59609272 https://www.erudit.org/revue/rseau/1988/v1/n4/705016ar.html https://academic.microsoft.com/#/detail/242595594 https://id.erudit.org/iderudit/705016ar |
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container_title |
Revue des sciences de l'eau |
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4 |
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339 |
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