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Sequential photochemical-biological degradation of chlorophenols

Essam, Tamer LU ; Amin, Magdy Aly; El Tayeb, Ossama; Mattiasson, Bo LU and Guieysse, Benoit LU (2007) In Chemosphere 66(11). p.2201-2209
Abstract
UV/TiO2/H2O2, UV/TiO2 and UV/H2O2 were compared as pre-treatment processes for the detoxification of mixtures of 4-chlorophenol (4CP), 2,4-dichlorophenol (DCP), 2,4,6-trichlorophenol (TCP) and pentachlorophenol (PCP) prior to their biological treatment. When each chlorophenol was initially supplied at 50mg l(-1),UV/TiO2/H2O2 treatment supported the highest pollutant removal, COD removal, and dechlorination efficiencies followed by UV/TiO2 and UV/H2O2. The remaining toxicity to Lipediurn sativurn was similar after all pre-treatments. Chlorophenol photodegradation was always well described by a first order model kinetic (r(2) > 0.94) and the shortest 4CP, DCP, TCP and PCP half-lives of 8.7, 7.1, 4.5 and 3.3 h, respectively, were achieved... (More)
UV/TiO2/H2O2, UV/TiO2 and UV/H2O2 were compared as pre-treatment processes for the detoxification of mixtures of 4-chlorophenol (4CP), 2,4-dichlorophenol (DCP), 2,4,6-trichlorophenol (TCP) and pentachlorophenol (PCP) prior to their biological treatment. When each chlorophenol was initially supplied at 50mg l(-1),UV/TiO2/H2O2 treatment supported the highest pollutant removal, COD removal, and dechlorination efficiencies followed by UV/TiO2 and UV/H2O2. The remaining toxicity to Lipediurn sativurn was similar after all pre-treatments. Chlorophenol photodegradation was always well described by a first order model kinetic (r(2) > 0.94) and the shortest 4CP, DCP, TCP and PCP half-lives of 8.7, 7.1, 4.5 and 3.3 h, respectively, were achieved during UV/TiO2/H2O2 treatment. No pollutant removal was observed in the controls conducted with H2O2 or TiO2 only. Inoculation of all the photochemically pre-treated mixtures with activated sludge microflora was followed by complete removal of the remaining pollutants. Combined UV/TiO2/H2O2-biological supported the highest detoxification, dechlorination (99%) and COD removal (88%) efficiencies. Similar results were achieved when each chlorophenol was supplied at 100 mg l(-1). COD and Cl mass balances indicated UV, UV/H2O2, and UV/TiO2 treatments lead to the formation of recalcitrant photoproducts, some of which were chlorinated. (c) 2006 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
hazardous pollutants, advanced oxidation processes, biodegradation, industrial wastewater, photodegradation
in
Chemosphere
volume
66
issue
11
pages
2201 - 2209
publisher
Elsevier
external identifiers
  • wos:000248678100022
  • scopus:33846084395
ISSN
1879-1298
DOI
10.1016/j.chemosphere.2006.08.036
language
English
LU publication?
yes
id
a0f76a8e-4a7d-4877-a11a-41cb0dd29876 (old id 692783)
date added to LUP
2007-12-11 20:22:29
date last changed
2017-10-22 03:51:17
@article{a0f76a8e-4a7d-4877-a11a-41cb0dd29876,
  abstract     = {UV/TiO2/H2O2, UV/TiO2 and UV/H2O2 were compared as pre-treatment processes for the detoxification of mixtures of 4-chlorophenol (4CP), 2,4-dichlorophenol (DCP), 2,4,6-trichlorophenol (TCP) and pentachlorophenol (PCP) prior to their biological treatment. When each chlorophenol was initially supplied at 50mg l(-1),UV/TiO2/H2O2 treatment supported the highest pollutant removal, COD removal, and dechlorination efficiencies followed by UV/TiO2 and UV/H2O2. The remaining toxicity to Lipediurn sativurn was similar after all pre-treatments. Chlorophenol photodegradation was always well described by a first order model kinetic (r(2) > 0.94) and the shortest 4CP, DCP, TCP and PCP half-lives of 8.7, 7.1, 4.5 and 3.3 h, respectively, were achieved during UV/TiO2/H2O2 treatment. No pollutant removal was observed in the controls conducted with H2O2 or TiO2 only. Inoculation of all the photochemically pre-treated mixtures with activated sludge microflora was followed by complete removal of the remaining pollutants. Combined UV/TiO2/H2O2-biological supported the highest detoxification, dechlorination (99%) and COD removal (88%) efficiencies. Similar results were achieved when each chlorophenol was supplied at 100 mg l(-1). COD and Cl mass balances indicated UV, UV/H2O2, and UV/TiO2 treatments lead to the formation of recalcitrant photoproducts, some of which were chlorinated. (c) 2006 Elsevier Ltd. All rights reserved.},
  author       = {Essam, Tamer and Amin, Magdy Aly and El Tayeb, Ossama and Mattiasson, Bo and Guieysse, Benoit},
  issn         = {1879-1298},
  keyword      = {hazardous pollutants,advanced oxidation processes,biodegradation,industrial wastewater,photodegradation},
  language     = {eng},
  number       = {11},
  pages        = {2201--2209},
  publisher    = {Elsevier},
  series       = {Chemosphere},
  title        = {Sequential photochemical-biological degradation of chlorophenols},
  url          = {http://dx.doi.org/10.1016/j.chemosphere.2006.08.036},
  volume       = {66},
  year         = {2007},
}