Effect of solution chemistry on coagulation with hydrolyzed Al(III)

Letterman, Raymond D.; Vanderbrook, S.G.

doi:10.1016/0043-1354(83)90100-8

Cited by 57 publications

(36 citation statements)

References 4 publications

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“…Recent study of the effect of soluble silica on the alum coagulation has also shown such a phenomenon (Duan, 1997). Similar improvement of coagulation has been found also with sulfate ion (Letterman, 1983). Although it becomes difficult to interpret the coagulation result with EM, the enhancement is involved closely with the kinetics of precipitation.…”

Section: Mechanism Of Coagulation With Pfsi: Effect Of Silicasupporting

confidence: 59%

Modified Inorganic Polymer Flocculant-PFSi: Its Preparation, Characterization and Coagulation Behavior

2001

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Section: Mechanism Of Coagulation With Pfsi: Effect Of Silicasupporting

confidence: 59%

Modified Inorganic Polymer Flocculant-PFSi: Its Preparation, Characterization and Coagulation Behavior

2001

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“…It is well known that the presence of certain anions can have profound effects on coagulation, depending on their nature. Letterman and Vanderbrook reported that sulfate also has the effects on the aluminum hydroxide system [3] . However, the detailed effect of sulfate on the action of coagulants still remains unclear.…”

mentioning

confidence: 99%

Investigation of dynamic processing on aluminum floc aggregation: Cyclic shearing recovery and effect of sulfate ion

Chu

Gao

Wang

2008

Sci. China Ser. B-Chem.

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The floc formation and re-aggregation potential and the effects of sulfate on coagulation by AlCl 3 , polyaluminum chloride (PAC), and Al 13 species using a photometric dispersion analyzer (PDA) are investigated. It is found that the recovery level from shearing is the highest for the Al 13 species. This is likely a result of increased collision efficiency due to more effective charge neutralization. The experimental results show that sulfate has a significant effect on coagulation and promoting aggregation of hydrolyzed species for the Al 13 species. It results in significant improvement of the coagulation efficiency through an electrostatic patch effect. The results further indicate that zeta potential of the particle suspension is not the only indicator for the coagulant efficiency when precipitate formation significantly improves coagulation.

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“…Cette acidité peut réagir sur certaines espèces en solution, notamment sur les ions bicarbonates (LETTERMAN et VANDERBROOK, 1983) selon la réaction 3 :…”

Section: Adoucissement Par Coagulation-floculationunclassified

Adoucissement des eaux souterraines de la région orientale du Sahara septentrional algérien : cas de la région de Biskra

Bouchahm

Hecini

Kherifi

2016

rseau

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Dans la ville de Biskra, l’alimentation en eau potable des habitants et l’irrigation des cultures reposent sur l’exploitation des eaux souterraines des aquifères du Sahara Septentrional. L’un des enjeux majeurs pour la durabilité de l’utilisation de cette ressource est la qualité des eaux de certains aquifères (Phréatique et Miopliocène). Ces dernières sont fortement minéralisées (entre 2 et 3 g∙L‑1 de sel dissous). Leur faciès chimique dominant est le sulfaté-chloruré avec un excès de chlorures, supérieur à la norme de l’Organisation mondiale de la Santé (OMS) de 250 mg∙L‑1. Afin de remédier à ce problème de salinité et dans le but de développer une technique d’adoucissement fiable et économiquement soutenable, nous avons dans ce travail expérimenté deux procédés d’adoucissement partiel, la coagulation-floculation au sulfate d’aluminium d’une part et la précipitation à la chaux éteinte Ca(OH)2 d’autre part. Les principaux résultats confirment que l’élimination des ions chlorures est plus ou moins faible, pour les deux procédés testés et sont respectivement de 29,7 % et de 19,1 %. Nous avons également mis en évidence que le traitement des eaux à la chaux éteinte était plus efficace, les ions sulfates étant réduits à 73,3 %. Toutefois, ce procédé a augmenté le pH des eaux traitées, ce qui a nécessité en aval un ajustement de ce dernier. De même, la concentration en ions bicarbonates a diminué d'environ 85 % car l'emploi de la chaux agit non seulement sur les chlorures et les sulfates associés aux ions calcium et magnésium, mais aussi sur les bicarbonates. Ces essais ont également permis de justifier le choix de la méthode la plus adaptée techniquement et économiquement pour l’adoucissement des eaux de la région d’étude.In Biskra drinking water supply for inhabitants and the irrigation of crops are based on the exploitation of the groundwater aquifers of the northern Sahara. One of the major challenges for the sustainability of use of this resource is water quality of some aquifers (phreatic and Miopliocene). These are highly mineralized (between 2 and 3 g∙L‑1 of dissolved salt), the dominant chemical facies being sulphate-chloride with an excess of chlorides higher than the World Health Organization (WHO) standard (250 mg∙L‑1). To remedy this problem of salinity and in order to develop a reliable and economically sustainable softening technique, we have tested two partial softening processes in this work, coagulation-flocculation with aluminum sulphate on the one hand and precipitation with slaked lime Ca(OH)2 on the other. The main results confirm that the removal of chloride ions is low for both tested processes, 29.7% and 19.1% respectively. We have also demonstrated that water treatment with slaked lime was more efficient, sulphate ions being reduced to 73.3%. However, this process increased the pH of the treated water and required a subsequent pH adjustment. Similarly, the concentration of bicarbonate ions decreased by about 85% because the use of slaked lime acts not only on chlorides and sulphates associate...

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Effect of solution chemistry on coagulation with hydrolyzed Al(III)

Cited by 57 publications

References 4 publications

Modified Inorganic Polymer Flocculant-PFSi: Its Preparation, Characterization and Coagulation Behavior

Modified Inorganic Polymer Flocculant-PFSi: Its Preparation, Characterization and Coagulation Behavior

Investigation of dynamic processing on aluminum floc aggregation: Cyclic shearing recovery and effect of sulfate ion

Adoucissement des eaux souterraines de la région orientale du Sahara septentrional algérien : cas de la région de Biskra

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