Biodegradability and toxicity assessment of trans-chlordane photochemical treatment

The removal of trans-chlordane (C10H6Cl8) from aqueous solutions was studied using UV, UV/H2O2, UV/H2O2/Fe2+, UV/TiO2, or UV/TiO2/H2O2 treatment using either UV/Vis blue lamps or UVC lamps (254 nm). H2O2, FeSO4 and TiO2 were added at 1700, 456, and 2500 mg L-1, respectively. trans-Chlordane was not...

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Main Authors: Moradas, Gerly, Auresenia, Joseph L., Gallardo, Susan, Guieysse, Benoit
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Published: Animo Repository 2008
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Online Access:https://animorepository.dlsu.edu.ph/faculty_research/1429
https://animorepository.dlsu.edu.ph/context/faculty_research/article/2428/type/native/viewcontent
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spelling oai:animorepository.dlsu.edu.ph:faculty_research-24282022-11-12T03:09:22Z Biodegradability and toxicity assessment of trans-chlordane photochemical treatment Moradas, Gerly Auresenia, Joseph L. Gallardo, Susan Guieysse, Benoit The removal of trans-chlordane (C10H6Cl8) from aqueous solutions was studied using UV, UV/H2O2, UV/H2O2/Fe2+, UV/TiO2, or UV/TiO2/H2O2 treatment using either UV/Vis blue lamps or UVC lamps (254 nm). H2O2, FeSO4 and TiO2 were added at 1700, 456, and 2500 mg L-1, respectively. trans-Chlordane was not significantly removed in non-irradiated controls and in samples irradiated with UV/Vis. It was also not removed in the absence of surfactant Triton X-114 added at 250 mg L-1. In the presence of the surfactant, trans-chlordane concentration was reduced by 95-100% after 48 h of UVC and UVC/H2O2 treatments and 70-80% after UVC/H2O2/Fe2+, UVC/TiO2 and UVC/H2O2/TiO2 treatments. Based on these results, UVC, UVC/H2O2 and UVC/TiO2 treatments were further investigated. UVC treatment supported the highest pollutant removal (100% in 48 h), dechlorination efficiency (81% in 48 h), and detoxification to Lepidium sativum seed germination and activated sludge respiration although irradiated samples remained toxic to Chlorella vulgaris. Biodegradation of the UVC irradiated samples removed the source of algae toxicity but this could not be clearly attributed to the removal of trans-chlordane photoproducts because the surfactant interfered with the chemical and biological assays. Evidence was found that trans-chlordane was photodegraded through photolysis causing its successive dechlorination. trans-Chlordane removal was well described by a first order kinetic model at a rate of 0.21 ± 0.01 h-1 at the 95% confidence interval. © 2008 Elsevier Ltd. All rights reserved. 2008-11-01T07:00:00Z text text/html https://animorepository.dlsu.edu.ph/faculty_research/1429 https://animorepository.dlsu.edu.ph/context/faculty_research/article/2428/type/native/viewcontent Faculty Research Work Animo Repository Oxidation Biodegradation Dechlorination Organochromium compounds Toxicity testing Chemical Engineering
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
topic Oxidation
Biodegradation
Dechlorination
Organochromium compounds
Toxicity testing
Chemical Engineering
spellingShingle Oxidation
Biodegradation
Dechlorination
Organochromium compounds
Toxicity testing
Chemical Engineering
Moradas, Gerly
Auresenia, Joseph L.
Gallardo, Susan
Guieysse, Benoit
Biodegradability and toxicity assessment of trans-chlordane photochemical treatment
description The removal of trans-chlordane (C10H6Cl8) from aqueous solutions was studied using UV, UV/H2O2, UV/H2O2/Fe2+, UV/TiO2, or UV/TiO2/H2O2 treatment using either UV/Vis blue lamps or UVC lamps (254 nm). H2O2, FeSO4 and TiO2 were added at 1700, 456, and 2500 mg L-1, respectively. trans-Chlordane was not significantly removed in non-irradiated controls and in samples irradiated with UV/Vis. It was also not removed in the absence of surfactant Triton X-114 added at 250 mg L-1. In the presence of the surfactant, trans-chlordane concentration was reduced by 95-100% after 48 h of UVC and UVC/H2O2 treatments and 70-80% after UVC/H2O2/Fe2+, UVC/TiO2 and UVC/H2O2/TiO2 treatments. Based on these results, UVC, UVC/H2O2 and UVC/TiO2 treatments were further investigated. UVC treatment supported the highest pollutant removal (100% in 48 h), dechlorination efficiency (81% in 48 h), and detoxification to Lepidium sativum seed germination and activated sludge respiration although irradiated samples remained toxic to Chlorella vulgaris. Biodegradation of the UVC irradiated samples removed the source of algae toxicity but this could not be clearly attributed to the removal of trans-chlordane photoproducts because the surfactant interfered with the chemical and biological assays. Evidence was found that trans-chlordane was photodegraded through photolysis causing its successive dechlorination. trans-Chlordane removal was well described by a first order kinetic model at a rate of 0.21 ± 0.01 h-1 at the 95% confidence interval. © 2008 Elsevier Ltd. All rights reserved.
format text
author Moradas, Gerly
Auresenia, Joseph L.
Gallardo, Susan
Guieysse, Benoit
author_facet Moradas, Gerly
Auresenia, Joseph L.
Gallardo, Susan
Guieysse, Benoit
author_sort Moradas, Gerly
title Biodegradability and toxicity assessment of trans-chlordane photochemical treatment
title_short Biodegradability and toxicity assessment of trans-chlordane photochemical treatment
title_full Biodegradability and toxicity assessment of trans-chlordane photochemical treatment
title_fullStr Biodegradability and toxicity assessment of trans-chlordane photochemical treatment
title_full_unstemmed Biodegradability and toxicity assessment of trans-chlordane photochemical treatment
title_sort biodegradability and toxicity assessment of trans-chlordane photochemical treatment
publisher Animo Repository
publishDate 2008
url https://animorepository.dlsu.edu.ph/faculty_research/1429
https://animorepository.dlsu.edu.ph/context/faculty_research/article/2428/type/native/viewcontent
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