Evaluation of decolorization, mineralization, and toxicity reduction of Tropaeolin O in water by ozonation with UV irradiation

Hao Jan Hsing; Pen Chi Chiang; E. E. Chang; Yi Shu Li

doi:10.1080/01919510500479056

Evaluation of decolorization, mineralization, and toxicity reduction of Tropaeolin O in water by ozonation with UV irradiation

Hao Jan Hsing, Pen Chi Chiang, E. E. Chang, Yi Shu Li

Department of Biochemistry and Molecular Cell Biology

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The combination of ozonation with UV irradiation can remove Tropaeolin O (AO6) and its by-products effectively and completely. The ozone dose affects the rate of decolorization, AO6 species removal, and dissolved organic carbon (DOC) reduction significantly. After 240 minutes of ozonation, the average DOC removal efficiency (ηDOC) for O₃ alone was about 0.79, while ηDOC for O₃/UV was 1.0. The average DOC removal rate was low at early stage of ozonation due to decolorization and low DOC. At later stage of ozonation, average DOC removal rate decreases because of the formation of persistent intermediates. The ozone consumption was consistent with ηDOC. The ratio of ozone consumption to ozone applied decreased from 14 to 12% when ηDOC <40% because the decolorization in the early stage of the ozonation of AO6 may consume a relatively large amount of ozone. It was found that NO₂, NO, CO₂, and small amount of SO₂ was detected in the off-gas. The effective concentration (EC50) increased from 23.48% to 100%, suggesting that the toxic reduction was achieved, and O ₃/UV system was superior to O₃ alone system.

Original language	English
Pages (from-to)	9-16
Number of pages	8
Journal	Ozone: Science and Engineering
Volume	28
Issue number	1
DOIs	https://doi.org/10.1080/01919510500479056
Publication status	Published - Feb 2006

Keywords

Decolorization
EC50
Ozone
Ozone Consumption Ratio
Tropaeolin O
UV irradiation

ASJC Scopus subject areas

General Environmental Science
Environmental Chemistry

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10.1080/01919510500479056

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title = "Evaluation of decolorization, mineralization, and toxicity reduction of Tropaeolin O in water by ozonation with UV irradiation",

abstract = "The combination of ozonation with UV irradiation can remove Tropaeolin O (AO6) and its by-products effectively and completely. The ozone dose affects the rate of decolorization, AO6 species removal, and dissolved organic carbon (DOC) reduction significantly. After 240 minutes of ozonation, the average DOC removal efficiency (ηDOC) for O3 alone was about 0.79, while ηDOC for O3/UV was 1.0. The average DOC removal rate was low at early stage of ozonation due to decolorization and low DOC. At later stage of ozonation, average DOC removal rate decreases because of the formation of persistent intermediates. The ozone consumption was consistent with ηDOC. The ratio of ozone consumption to ozone applied decreased from 14 to 12% when ηDOC <40% because the decolorization in the early stage of the ozonation of AO6 may consume a relatively large amount of ozone. It was found that NO2, NO, CO2, and small amount of SO2 was detected in the off-gas. The effective concentration (EC50) increased from 23.48% to 100%, suggesting that the toxic reduction was achieved, and O 3/UV system was superior to O3 alone system.",

keywords = "Decolorization, EC50, Ozone, Ozone Consumption Ratio, Tropaeolin O, UV irradiation",

author = "Hsing, {Hao Jan} and Chiang, {Pen Chi} and Chang, {E. E.} and Li, {Yi Shu}",

note = "Funding Information: The support of this project by the National Science Council (Project No. NSC 91-2211-E-002-024) is gratefully acknowledged.",

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AU - Hsing, Hao Jan

AU - Chiang, Pen Chi

AU - Chang, E. E.

AU - Li, Yi Shu

N1 - Funding Information: The support of this project by the National Science Council (Project No. NSC 91-2211-E-002-024) is gratefully acknowledged.

PY - 2006/2

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N2 - The combination of ozonation with UV irradiation can remove Tropaeolin O (AO6) and its by-products effectively and completely. The ozone dose affects the rate of decolorization, AO6 species removal, and dissolved organic carbon (DOC) reduction significantly. After 240 minutes of ozonation, the average DOC removal efficiency (ηDOC) for O3 alone was about 0.79, while ηDOC for O3/UV was 1.0. The average DOC removal rate was low at early stage of ozonation due to decolorization and low DOC. At later stage of ozonation, average DOC removal rate decreases because of the formation of persistent intermediates. The ozone consumption was consistent with ηDOC. The ratio of ozone consumption to ozone applied decreased from 14 to 12% when ηDOC <40% because the decolorization in the early stage of the ozonation of AO6 may consume a relatively large amount of ozone. It was found that NO2, NO, CO2, and small amount of SO2 was detected in the off-gas. The effective concentration (EC50) increased from 23.48% to 100%, suggesting that the toxic reduction was achieved, and O 3/UV system was superior to O3 alone system.

AB - The combination of ozonation with UV irradiation can remove Tropaeolin O (AO6) and its by-products effectively and completely. The ozone dose affects the rate of decolorization, AO6 species removal, and dissolved organic carbon (DOC) reduction significantly. After 240 minutes of ozonation, the average DOC removal efficiency (ηDOC) for O3 alone was about 0.79, while ηDOC for O3/UV was 1.0. The average DOC removal rate was low at early stage of ozonation due to decolorization and low DOC. At later stage of ozonation, average DOC removal rate decreases because of the formation of persistent intermediates. The ozone consumption was consistent with ηDOC. The ratio of ozone consumption to ozone applied decreased from 14 to 12% when ηDOC <40% because the decolorization in the early stage of the ozonation of AO6 may consume a relatively large amount of ozone. It was found that NO2, NO, CO2, and small amount of SO2 was detected in the off-gas. The effective concentration (EC50) increased from 23.48% to 100%, suggesting that the toxic reduction was achieved, and O 3/UV system was superior to O3 alone system.

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KW - Ozone Consumption Ratio

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Evaluation of decolorization, mineralization, and toxicity reduction of Tropaeolin O in water by ozonation with UV irradiation

Abstract

Keywords

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