Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process

This study describes the removal of sulfamethoxazole and cephalexin by catalytic ozonation process in two types of reactors i) batch stirred type and ii) water circulation type. The first step was to screen a suitable catalyst during ozonation of sulfamethoxazole in a batch type reactor. It was obse...

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Main Author:	Akhtar, Javaid
Format:	Thesis
Language:	English
Published:	2011
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/36920/5/JavaidAkhtarPFKKSA2011.pdf
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spelling	my-utm-ep.369202018-05-27T08:15:35Z Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process 2011-10 Akhtar, Javaid QD Chemistry This study describes the removal of sulfamethoxazole and cephalexin by catalytic ozonation process in two types of reactors i) batch stirred type and ii) water circulation type. The first step was to screen a suitable catalyst during ozonation of sulfamethoxazole in a batch type reactor. It was observed that loading of Fe2O3/CeO2 did not suppress the adsorption capacity of PAC and that adsorption process was by physisorption for Fe2O3/CeO2 loaded PAC or PAC. Moreover, the loading of Fe2O3/CeO2 synergized the effectiveness of powdered activated carbon (PAC), for removal of sulfamethoxazole during catalytic ozonation. Complete removal of sulfamethoxazole was observed using Fe2O3/CeO2 loaded PAC catalyst within 5 min of ozonation on batch reactor. Further screening of catalyst suggested granular activated carbon (GAC) was a better catalyst compared to CeO2, MnO2, and MnO2- CeO2 metal oxides. In the presence of GAC as catalyst, approximately 90 % of cephalexin was removed in 5 min during batch ozonation process. GAC assisted ozonation of two antibiotics was conducted in a newly developed circulating reactors. Circulating batch reactor removed > 98 % of sulfamethoxazole and > 80% of COD using GAC as catalyst in 15 min duration. Similarly, 80-100% of cephalexin was removed using circulation batch reactor. Biodegradability was increased to more than 90% and 98% for cephalexin and sulfamethoxazole antibiotics respectively using circulating batch ozonation. Finally, a separate study was performed for solid phase regeneration of GAC to emulate the effectiveness of in-situ regeneration during ozonation process. In situ ozonation regenerated GAC efficiently. BET analysis, TPD-N2 and TGA profiles of regenerated GAC resembled more of virgin GAC and differed from saturated GAC sample. 2011-10 Thesis http://eprints.utm.my/id/eprint/36920/ http://eprints.utm.my/id/eprint/36920/5/JavaidAkhtarPFKKSA2011.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Chemical Engineering Faculty of Chemical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Akhtar, Javaid Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process
description	This study describes the removal of sulfamethoxazole and cephalexin by catalytic ozonation process in two types of reactors i) batch stirred type and ii) water circulation type. The first step was to screen a suitable catalyst during ozonation of sulfamethoxazole in a batch type reactor. It was observed that loading of Fe2O3/CeO2 did not suppress the adsorption capacity of PAC and that adsorption process was by physisorption for Fe2O3/CeO2 loaded PAC or PAC. Moreover, the loading of Fe2O3/CeO2 synergized the effectiveness of powdered activated carbon (PAC), for removal of sulfamethoxazole during catalytic ozonation. Complete removal of sulfamethoxazole was observed using Fe2O3/CeO2 loaded PAC catalyst within 5 min of ozonation on batch reactor. Further screening of catalyst suggested granular activated carbon (GAC) was a better catalyst compared to CeO2, MnO2, and MnO2- CeO2 metal oxides. In the presence of GAC as catalyst, approximately 90 % of cephalexin was removed in 5 min during batch ozonation process. GAC assisted ozonation of two antibiotics was conducted in a newly developed circulating reactors. Circulating batch reactor removed > 98 % of sulfamethoxazole and > 80% of COD using GAC as catalyst in 15 min duration. Similarly, 80-100% of cephalexin was removed using circulation batch reactor. Biodegradability was increased to more than 90% and 98% for cephalexin and sulfamethoxazole antibiotics respectively using circulating batch ozonation. Finally, a separate study was performed for solid phase regeneration of GAC to emulate the effectiveness of in-situ regeneration during ozonation process. In situ ozonation regenerated GAC efficiently. BET analysis, TPD-N2 and TGA profiles of regenerated GAC resembled more of virgin GAC and differed from saturated GAC sample.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Akhtar, Javaid
author_facet	Akhtar, Javaid
author_sort	Akhtar, Javaid
title	Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process
title_short	Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process
title_full	Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process
title_fullStr	Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process
title_full_unstemmed	Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process
title_sort	removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical Engineering
granting_department	Faculty of Chemical Engineering
publishDate	2011
url	http://eprints.utm.my/id/eprint/36920/5/JavaidAkhtarPFKKSA2011.pdf
_version_	1747816478784094208

Removal of sulfamethoxazole and cephalexin from water by catalytic ozonation process

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