Recent Advances in Ozone Treatment of Drinking Water

Rice, Rip G.

doi:10.1007/978-1-4615-3282-8_62

Cited by 1 publication

(1 citation statement)

References 16 publications

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“…Although STX and neoSTX share a similar structure, the hydroxyl group in R2 position in the neoSTX molecule (refer to Figure 7) may enhance the oxidation of neoSTX by O 3 . The position of the hydroxyl group adjacent to the C N bond in the neoSTX molecule creates a mesomeric effect, and hence may increase the reactivity of neoSTX toward ozone (Rice, 1989). In addition, the deprotonation of the amines in the STXs molecules with increasing pH may also explain the increased reaction rate of all three variants to direct ozonation.…”

Section: Oxidation By Ozonementioning

confidence: 99%

Determination of oxidation rate constant for nodularin‐r, saxitoxin, dc‐saxitoxin, and neo‐saxitoxin with conventional water treatment plant oxidants and advanced oxidation processes

Maalouf,

Adams,

Hoppe‐Jones

2024

AWWA Water Science

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The effectiveness of chemical oxidation depends on the type of cyanotoxins present in the water and varies with the water quality parameters. This study investigated four cyanotoxins to understand their reactions with conventional drinking water treatment plant oxidants and with advanced oxidation. Kinetic rate constants between saxitoxin, and two variants (dcSTX and neoSTX), and nodularin‐R with chlorine, monochloramine, permanganate, ozone, and hydroxyl radicals (UV‐H2O2) were developed under different pH and temperature conditions. Nodularin‐R kinetic rate constants were comparable to peer‐reviewed microcystin‐LR rate constants with reaction rates in the order of OH radicals > ozone >> chlorine > permanganate >> monochloramine. The speciation of saxitoxins with pH had a dominant effect on their reaction rates with the listed oxidants. Chlorine was the only oxidant effective for saxitoxins removal. The reaction rates of saxitoxins with OH radicals varied slightly with pH but were around two orders of magnitude less than microcystin‐LR's.

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Section: Oxidation By Ozonementioning

confidence: 99%