Aluminum‐Fulvic Acid Interactions: Mechanisms and Applications

Hundt, Thomas R.; O’Melia, Charles R.

doi:10.1002/j.1551-8833.1988.tb03023.x

Cited by 102 publications

(55 citation statements)

References 21 publications

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“…Because of electrostatic effects of DBP precursors decreasing, DBP precursors precipitated through self-aggregation and charge neutralization with aluminum species (6,8). In this study, more THM precursors were neutralized by PACl with a higher K-Al 13 content than AlCl3.…”

Section: Role Of Aluminum Speciation In Removal Of Dbp Precursors Witmentioning

confidence: 65%

Role of Aluminum Speciation in the Removal of Disinfection Byproduct Precursors by a Coagulation Process

Zhao

Liu

et al. 2008

Environ. Sci. Technol.

124

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Humic acid (HA) was extracted and separated into different molecular weight (MW) fractions, then coagulated by aluminum chloride and polyaluminum chloride (PACl). The removal of disinfection byproduct (DBP) precursors and the aluminum speciation variation of the coagulants were investigated in detail. In particular, the role of aluminum speciation in the removal of DBP precursors was discussed. During the coagulation process, AlCl 3 hydrolyzed into dominating in situ Al 13 species at pH 5.5. The in situ Al 13 species exhibited better removal ability for haloacetic acid (HAA) precursors than PACl. At pH 7.5, in situ hydrolyzed Al 13 species of AlCl 3 decomposed into dimeric Al species. In this case, preformed Al 13 of PACl had a high removal ability of HAA precursors. Specially, the greatest reduction of HAA precursors with a low MW (<30 kDa) was through charge neutralization at pH 5.5, and that of HAA precursors in high MW (>30 kDa) fractions was through adsorption at pH 7.5. Different from HAA precursors, the in situ Al 13 species did not have a high removal ability of trihalomethane (THM) precursors. Therefore, PACl exhibited a better removal ability of THM precursors than AlCl 3 at different pH values. In the different MW fractions, the greatest reduction of THM precursors was through charge neutralization at pH 5.5.

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Section: Role Of Aluminum Speciation In Removal Of Dbp Precursors Witmentioning

confidence: 65%

Role of Aluminum Speciation in the Removal of Disinfection Byproduct Precursors by a Coagulation Process

Zhao

Liu

et al. 2008

Environ. Sci. Technol.

124

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“…The flocs generated from Al 13 polymer showed a larger flocs size and a rougher surface structure than other Al species [21]. It has been suggested that adsorption onto Al hydroxide precipitates is an important pathway for the removal of NOM [34], and the extent of adsorption depends on the flocs structure and morphology, which was proved by the results of Fig. 7.…”

Section: Role Of Flocs In Ha Removalmentioning

confidence: 67%

Enhanced efficiency in HA removal by electrocoagulation through optimizing flocs properties: Role of current density and pH

Sun

Wang

et al. 2017

Separation and Purification Technology

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“…On one hand, although eutrophication is menacing the safety of drinking water supply, the coagulation behavior of Al coagulants in eutrophic water has not been systemically studied. On the other hand, although the influence of Al speciation on coagulation behavior has received a lot of attention (11,24,28,29), few investigators focused on the effect of Al13 species on the coagulation efficiency in raw water. Furthermore, the relationship between Al speciation and coagulation behavior needs clarification from the viewpoint of the transformation of Al hydrolysis products during the coagulation process.…”

Section: +mentioning

confidence: 99%

Coagulation Behavior of Aluminum Salts in Eutrophic Water: Significance of Al₁₃ Species and pH Control

Liu

et al. 2005

Environ. Sci. Technol.

279

137

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The coagulation behavior of aluminum salts in a eutrophic source water was investigated from the viewpoint of Al-(III) hydrolysis species transformation. Particular emphasis was paid to the coagulation effect of Al 13 species on removing particles and organic matter. The coagulation behavior of Al coagulants with different basicities was examined through jar tests and hydrolyzed Al(III) speciation distribution characterization in the coagulation process. The results showed that the coagulation efficiency of Al coagulants positively correlated with the content of Al 13 in the coagulation process rather than in the initial coagulants. Aluminum chloride (AlCl 3 ) was more effective than polyaluminum chloride (PACl) in removing turbidity and dissolved organic matter in eutrophic water because AlCl 3 could not only generate Al 13 species but also function as a pH control agent in the coagulation process. The solidstate 27 Al NMR spectra revealed that the precipitates formed from AlCl 3 and PACl were significantly different and proved that the preformed Al 13 polymer was more stable than the in situ formed one during the coagulation process. Through regulating Al speciation, pH control could improve the coagulation process especially in DOC removal, and AlCl 3 benefited most from pH control.

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Aluminum‐Fulvic Acid Interactions: Mechanisms and Applications

Cited by 102 publications

References 21 publications

Role of Aluminum Speciation in the Removal of Disinfection Byproduct Precursors by a Coagulation Process

Role of Aluminum Speciation in the Removal of Disinfection Byproduct Precursors by a Coagulation Process

Enhanced efficiency in HA removal by electrocoagulation through optimizing flocs properties: Role of current density and pH

Coagulation Behavior of Aluminum Salts in Eutrophic Water: Significance of Al₁₃ Species and pH Control

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Aluminum‐Fulvic Acid Interactions: Mechanisms and Applications

Cited by 102 publications

References 21 publications

Role of Aluminum Speciation in the Removal of Disinfection Byproduct Precursors by a Coagulation Process

Role of Aluminum Speciation in the Removal of Disinfection Byproduct Precursors by a Coagulation Process

Enhanced efficiency in HA removal by electrocoagulation through optimizing flocs properties: Role of current density and pH

Coagulation Behavior of Aluminum Salts in Eutrophic Water: Significance of Al13 Species and pH Control

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Coagulation Behavior of Aluminum Salts in Eutrophic Water: Significance of Al₁₃ Species and pH Control