Treatment of organic contaminants from water using an integrated sorption-oxidation system

Hossain, SMG

Treatment of organic contaminants from water using an integrated sorption-oxidation system

Hossain, SMG

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Publication Type:: Thesis
Issue Date:: 2012

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Field	Value	Language
dc.contributor.author	Hossain, SMG
dc.date.accessioned	2013-07-04T05:48:01Z
dc.date.available	2013-07-04T05:48:01Z
dc.date.issued	2012
dc.identifier.uri	http://hdl.handle.net/10453/23390
dc.description	University of Technology, Sydney. Faculty of Engineering and Information Technology.	en_US
dc.description.abstract	In-situ treatment of chlorophenols using a permeable reactive barrier is still an emerging research area. A novel integrated sorption-oxidation barrier is proposed and systematically investigated in a neutral pH, very poorly buffered water. Intermittent injections of permanganate oxidise dissolved and sorbed chlorophenol as well as the woody sorbent with manganese dioxide formed as a by-product. Common woody biomass (pine/hardwood) were evaluated as a cost effective sorbent. Chlorophenol uptake on these was relatively low (3–8 mg g-1) with evidence of sorption hysteresis. Increased sorbent particle size and reactions with the oxidant did not significantly affect sorption. Under dynamic conditions non-equilibrium sorption occurred with higher flow rates. Oxidation within the porous media was complex with multiple oxidation processes occurring simultaneously. An analytical method was developed to allow the quantification of chlorophenol in the presence of a quenching agent. This allowed the collection of kinetic data for the permanganate oxidation reaction. Oxidation of dissolved chlorophenol by manganese dioxide was found to be minimal. Early time data showed that the oxidation rate of pine (0.06 min-1) was less than for chlorophenol sorbed on pine (0.07–0.12 min-1) which was much less than for dissolved chlorophenols (0.4–1.48 min-1). This suggests that the reaction between permanganate and pine materials is kinetically controlled and will dominate only after the oxidation reaction with chlorophenol. The rate of sorbed chlorophenol oxidation decreased with increasing contaminant hydrophobicity. In column studies the oxidation of the pine sorbent was found to be both pH and residence time dependent. Some evidence of sorbent/column plugging and reduced sorbent oxidant demand due to manganese dioxide precipitation was found at pH 6.15 but not at pH 2. The research has shown that a novel sorbent-oxidation barrier system that can treat chlorophenol contaminated water is technically feasible. Insights into the key mechanisms that would occur in the system have been given. Further work into operationalizing these processes is still needed.	en_US
dc.format	Thesis (PhD)	en_US
dc.language.iso	en	en_US
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/23390/2/02whole.pdf
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	au.edu.uts.lib/ppc
dc.subject	Sorption.	en
dc.subject	Oxidation.	en
dc.subject	Water purification.	en
dc.subject	Adsorption.	en
dc.subject	Chlorophenols.	en
dc.title	Treatment of organic contaminants from water using an integrated sorption-oxidation system	en_US
dc.type	Thesis
utslib.copyright.status	open_access

Abstract:

In-situ treatment of chlorophenols using a permeable reactive barrier is still an emerging research area. A novel integrated sorption-oxidation barrier is proposed and systematically investigated in a neutral pH, very poorly buffered water. Intermittent injections of permanganate oxidise dissolved and sorbed chlorophenol as well as the woody sorbent with manganese dioxide formed as a by-product. Common woody biomass (pine/hardwood) were evaluated as a cost effective sorbent. Chlorophenol uptake on these was relatively low (3–8 mg g-1) with evidence of sorption hysteresis. Increased sorbent particle size and reactions with the oxidant did not significantly affect sorption. Under dynamic conditions non-equilibrium sorption occurred with higher flow rates. Oxidation within the porous media was complex with multiple oxidation processes occurring simultaneously. An analytical method was developed to allow the quantification of chlorophenol in the presence of a quenching agent. This allowed the collection of kinetic data for the permanganate oxidation reaction. Oxidation of dissolved chlorophenol by manganese dioxide was found to be minimal. Early time data showed that the oxidation rate of pine (0.06 min-1) was less than for chlorophenol sorbed on pine (0.07–0.12 min-1) which was much less than for dissolved chlorophenols (0.4–1.48 min-1). This suggests that the reaction between permanganate and pine materials is kinetically controlled and will dominate only after the oxidation reaction with chlorophenol. The rate of sorbed chlorophenol oxidation decreased with increasing contaminant hydrophobicity. In column studies the oxidation of the pine sorbent was found to be both pH and residence time dependent. Some evidence of sorbent/column plugging and reduced sorbent oxidant demand due to manganese dioxide precipitation was found at pH 6.15 but not at pH 2. The research has shown that a novel sorbent-oxidation barrier system that can treat chlorophenol contaminated water is technically feasible. Insights into the key mechanisms that would occur in the system have been given. Further work into operationalizing these processes is still needed.

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http://hdl.handle.net/10453/23390