Adapting a drinking water treatment technology for arsenic removal to the context of a small, low-income California community

Glade, Sara; Bandaru, Siva; Nahata, Mohit; Majmudar, Jay; Gadgil, Ashok

doi:10.1016/j.watres.2021.117595

Cited by 14 publications

(2 citation statements)

References 26 publications

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“…In consequence, the percentages of As and sulfuric acid extracted were higher; however, and in accordance with the previous results (Figure 2), the percentages of arsenic are sulfuric acid extraction were slightly lower in the case of 3 M sulfuric acid than when the 1.5 M sulfuric acid solution was used in the experiments. With respect to the separation of arsenic from sulfuric acid, Table 6 shows the values of the arsenic-sulfuric acid separation factors, defined as: SF / D D (5) where D refers to the corresponding distribution coefficients. The results presented in Table 6 indicate that arsenic can be most effectively separated from the acid at low O/A ratios, though the co-extraction of both solutes was also a possibility, since they can be separated conveniently in the stripping stage (see below).…”

Section: Influence Of the O/a Relationshipmentioning

confidence: 99%

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Solvent Extraction with Cyanex 923 to Remove Arsenic(V) from Solutions

Alguacil,

Escudero,

Robla

2024

Molecules

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The removal of harmful arsenic(V) from aqueous solutions using Cyanex 923 (solvation extractant) was investigated using various experimental variables: equilibration time, the acidity of the aqueous phase, temperature, extractant and arsenic concentrations, and O/A ratio. Cyanex 923 extracted As(V) (and sulfuric acid) from acidic solutions; however, it could not be used to remove the metal from slightly acid or neutral solutions. The extraction of arsenic is exothermic and responded to the formation of H3AsO4·nL species in the organic phase (L represents the extractant, and the stoichiometric factor, n = 1 or 2, depends on the acidity of the aqueous phase). Extraction isotherms are derived from the experimental results. Both arsenic and sulfuric acid loaded onto the organic phase can be stripped with water, and stripping isotherms are also derived from the experimental results. The selectivity of the system against the presence of other metals (Cu(II), Ni(II), Bi(III), and Sb(III)) is investigated, and the ability of Cyanex 923 to extract As(V) and sulfuric acid compared to the use of other P=O-based solvation reagents, such dibutyl butylphosphonate (DBBP) and tri-butyl phosphate (TBP), is also investigated.

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Section: Influence Of the O/a Relationshipmentioning

confidence: 99%

“…It has been found that the presence of the above arsenic species in the organism causes different diseases, including cancer [ 3 , 4 ]. The maximum contaminant limit for arsenic in drinking water set by the EPA is 10 μg/L [ 5 ].…”

Section: Introductionmentioning

confidence: 99%