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As(III) oxidation using chemical and solid‐phase oxidants
The effectiveness of seven oxidants—chlorine (Cl2), permanganate (MnO4−), ozone (O3), monochloramine (NH2Cl), chlorine dioxide (ClO2), a manganese dioxide‐based solid‐oxidizing media, and 254‐nm ultraviolet radiation—for arsenite [As(III)] oxidation to arsenate was studied. The effect of water chemistry variables including pH, temperature, and interfering reductants (manganous and ferrous ions, sulfide, and total organic carbon [TOC]) was investigated. Cl2 and MnO4− provided complete oxidation in less than 1 min under all conditions tested. The effectiveness of O3 was significantly attenuated in the presence of TOC. Both ClO2 (an otherwise powerful oxidant) and NH2Cl were ineffective for As(III) oxidation. When dissolved oxygen (DO) was not limiting, the solid‐oxidizing media provided complete oxidation. However, with low DO and interfering reductants, incomplete oxidation was observed. The adverse effect of interfering reductants was eliminated either by supplying enough DO or reducing the flow rate. UV light alone (254 nm) was not effective, but complete As(III) oxidation was observed when the feedwater was spiked with 1 mg/L of sulfite.
As(III) oxidation using chemical and solid‐phase oxidants
The effectiveness of seven oxidants—chlorine (Cl2), permanganate (MnO4−), ozone (O3), monochloramine (NH2Cl), chlorine dioxide (ClO2), a manganese dioxide‐based solid‐oxidizing media, and 254‐nm ultraviolet radiation—for arsenite [As(III)] oxidation to arsenate was studied. The effect of water chemistry variables including pH, temperature, and interfering reductants (manganous and ferrous ions, sulfide, and total organic carbon [TOC]) was investigated. Cl2 and MnO4− provided complete oxidation in less than 1 min under all conditions tested. The effectiveness of O3 was significantly attenuated in the presence of TOC. Both ClO2 (an otherwise powerful oxidant) and NH2Cl were ineffective for As(III) oxidation. When dissolved oxygen (DO) was not limiting, the solid‐oxidizing media provided complete oxidation. However, with low DO and interfering reductants, incomplete oxidation was observed. The adverse effect of interfering reductants was eliminated either by supplying enough DO or reducing the flow rate. UV light alone (254 nm) was not effective, but complete As(III) oxidation was observed when the feedwater was spiked with 1 mg/L of sulfite.
As(III) oxidation using chemical and solid‐phase oxidants
Ghurye, Ganesh (Autor:in) / Clifford, Dennis (Autor:in)
Journal ‐ American Water Works Association ; 96 ; 84-96
01.01.2004
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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