TCAA degradation in ultraviolet (UV) irradiation/hydrogen peroxide (H 2O2)/micro-aeration (MCA) combination process

N. Y. Gao, W. H. Chu, Yang Deng, B. Xu

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

The photochemical degradation of trichloroacetic acid (TCAA) employing ultraviolet (UV) irradiation/hydrogen peroxide (H2O 2)/micro-aeration (MCA) combination process was investigated by varying operational parameters. Relatively slow TCAA degradation was observed during direct UV radiation and H2O2 oxidation, while TCAA cannot be removed by MCA alone. UV/H2O2/MCA combination process proved to be more effective than UV/H2O2. With the initial concentration of 55.7 μgl-1, more than 93.4% of TCAA can be removed within 180 min under UV radiation intensity of 1,048.7 μW cm -2, H2O2 dosage of 30mgl-1 and MCA flow rate of 25 l min-1 in neutral conditions. Removal rate of TCAA was sensitive to UV radiation intensity, H2O2 dose and solution pH, but appeared to be slightly influenced by initial TCAA concentration. There was a higher correlation between pseudo-first rate constant k and UV intensity and H2O2 dosage, implying that higher removal capacity can be achieved by improvement of both factors. The newly found trichloroacetamide (TCAcAm), the potential TCAA, was more frangible than TCAA, indicating that TCAA hardly regenerates by hydrolysis of TCAcAm. Finally, a preliminary cost analysis revealed that the UV/H2O2/MCA process was more cost-effective than the UV/H2O2 process in removal of TCAA from drinking water.

Original languageEnglish
Pages (from-to)510-518
Number of pages9
JournalJournal of Water Supply: Research and Technology - AQUA
Volume58
Issue number7
DOIs
StatePublished - 1 Dec 2009

Fingerprint

Trichloroacetic acid
Trichloroacetic Acid
Hydrogen peroxide
hydrogen peroxide
Hydrogen Peroxide
aeration
irradiation
Irradiation
Degradation
Hydrogen
degradation
acid
ultraviolet radiation
Ultraviolet radiation
Radiation
Costs and Cost Analysis
cost analysis
Potable water
Drinking Water
Costs

Keywords

  • Advanced oxidation processes
  • Cost analysis
  • Disinfection by-products
  • Microaeration
  • Trichloroacetamide
  • Trichloroacetic acid

Cite this

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title = "TCAA degradation in ultraviolet (UV) irradiation/hydrogen peroxide (H 2O2)/micro-aeration (MCA) combination process",
abstract = "The photochemical degradation of trichloroacetic acid (TCAA) employing ultraviolet (UV) irradiation/hydrogen peroxide (H2O 2)/micro-aeration (MCA) combination process was investigated by varying operational parameters. Relatively slow TCAA degradation was observed during direct UV radiation and H2O2 oxidation, while TCAA cannot be removed by MCA alone. UV/H2O2/MCA combination process proved to be more effective than UV/H2O2. With the initial concentration of 55.7 μgl-1, more than 93.4{\%} of TCAA can be removed within 180 min under UV radiation intensity of 1,048.7 μW cm -2, H2O2 dosage of 30mgl-1 and MCA flow rate of 25 l min-1 in neutral conditions. Removal rate of TCAA was sensitive to UV radiation intensity, H2O2 dose and solution pH, but appeared to be slightly influenced by initial TCAA concentration. There was a higher correlation between pseudo-first rate constant k and UV intensity and H2O2 dosage, implying that higher removal capacity can be achieved by improvement of both factors. The newly found trichloroacetamide (TCAcAm), the potential TCAA, was more frangible than TCAA, indicating that TCAA hardly regenerates by hydrolysis of TCAcAm. Finally, a preliminary cost analysis revealed that the UV/H2O2/MCA process was more cost-effective than the UV/H2O2 process in removal of TCAA from drinking water.",
keywords = "Advanced oxidation processes, Cost analysis, Disinfection by-products, Microaeration, Trichloroacetamide, Trichloroacetic acid",
author = "Gao, {N. Y.} and Chu, {W. H.} and Yang Deng and B. Xu",
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TCAA degradation in ultraviolet (UV) irradiation/hydrogen peroxide (H 2O2)/micro-aeration (MCA) combination process. / Gao, N. Y.; Chu, W. H.; Deng, Yang; Xu, B.

In: Journal of Water Supply: Research and Technology - AQUA, Vol. 58, No. 7, 01.12.2009, p. 510-518.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - TCAA degradation in ultraviolet (UV) irradiation/hydrogen peroxide (H 2O2)/micro-aeration (MCA) combination process

AU - Gao, N. Y.

AU - Chu, W. H.

AU - Deng, Yang

AU - Xu, B.

PY - 2009/12/1

Y1 - 2009/12/1

N2 - The photochemical degradation of trichloroacetic acid (TCAA) employing ultraviolet (UV) irradiation/hydrogen peroxide (H2O 2)/micro-aeration (MCA) combination process was investigated by varying operational parameters. Relatively slow TCAA degradation was observed during direct UV radiation and H2O2 oxidation, while TCAA cannot be removed by MCA alone. UV/H2O2/MCA combination process proved to be more effective than UV/H2O2. With the initial concentration of 55.7 μgl-1, more than 93.4% of TCAA can be removed within 180 min under UV radiation intensity of 1,048.7 μW cm -2, H2O2 dosage of 30mgl-1 and MCA flow rate of 25 l min-1 in neutral conditions. Removal rate of TCAA was sensitive to UV radiation intensity, H2O2 dose and solution pH, but appeared to be slightly influenced by initial TCAA concentration. There was a higher correlation between pseudo-first rate constant k and UV intensity and H2O2 dosage, implying that higher removal capacity can be achieved by improvement of both factors. The newly found trichloroacetamide (TCAcAm), the potential TCAA, was more frangible than TCAA, indicating that TCAA hardly regenerates by hydrolysis of TCAcAm. Finally, a preliminary cost analysis revealed that the UV/H2O2/MCA process was more cost-effective than the UV/H2O2 process in removal of TCAA from drinking water.

AB - The photochemical degradation of trichloroacetic acid (TCAA) employing ultraviolet (UV) irradiation/hydrogen peroxide (H2O 2)/micro-aeration (MCA) combination process was investigated by varying operational parameters. Relatively slow TCAA degradation was observed during direct UV radiation and H2O2 oxidation, while TCAA cannot be removed by MCA alone. UV/H2O2/MCA combination process proved to be more effective than UV/H2O2. With the initial concentration of 55.7 μgl-1, more than 93.4% of TCAA can be removed within 180 min under UV radiation intensity of 1,048.7 μW cm -2, H2O2 dosage of 30mgl-1 and MCA flow rate of 25 l min-1 in neutral conditions. Removal rate of TCAA was sensitive to UV radiation intensity, H2O2 dose and solution pH, but appeared to be slightly influenced by initial TCAA concentration. There was a higher correlation between pseudo-first rate constant k and UV intensity and H2O2 dosage, implying that higher removal capacity can be achieved by improvement of both factors. The newly found trichloroacetamide (TCAcAm), the potential TCAA, was more frangible than TCAA, indicating that TCAA hardly regenerates by hydrolysis of TCAcAm. Finally, a preliminary cost analysis revealed that the UV/H2O2/MCA process was more cost-effective than the UV/H2O2 process in removal of TCAA from drinking water.

KW - Advanced oxidation processes

KW - Cost analysis

KW - Disinfection by-products

KW - Microaeration

KW - Trichloroacetamide

KW - Trichloroacetic acid

UR - http://www.scopus.com/inward/record.url?scp=77149133779&partnerID=8YFLogxK

U2 - 10.2166/aqua.2009.005

DO - 10.2166/aqua.2009.005

M3 - Article

VL - 58

SP - 510

EP - 518

JO - Journal of Water Supply: Research and Technology - AQUA

JF - Journal of Water Supply: Research and Technology - AQUA

SN - 0003-7214

IS - 7

ER -