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Chlorine quenching phenomena and the application of fluorescence spectroscopy in drinking water

Al-Janabi, Shahad Sadeq (2013)
Ph.D. thesis, University of Birmingham.

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Abstract

The purpose of this study is to examine and understand the chlorine quenching phenomena and the application of fluorescence spectroscopy under chlorinated and rechlorinated conditions.
Partially treated water samples were collected from various water treatment works and dosed with range of initial chlorine concentrations. Measurements of the residual chlorine, fluorescence intensities and THMs were conducted simultaneously at specific time intervals until residual chlorine deplete to below detection limits.
Results show the maximum quenching of fluorescence intensity is between 10% and 60% of the initial intensity value. The quenching amounts were found to increase proportionally to an increase in the initial chlorine dosage. The organic matter (OM) reaction pathway with respect to chlorine was found to consist of three phases; a rapid decrease in intensity, a slow steady decrease in intensity, and a recovery or steady state. The fluorescence quenching mechanisms static and dynamic were found to be associated with the OM reaction pathway. The OM intensity was used to develop an effective model to predict THMs. The quenching Stern-Volmer models were found to be valuable and straightforward for calculating the chlorine consumption in drinking water. Finally rechlorination conditions showed increase in the amount of quenched intensity with low chlorine dosage.

Type of Work:Ph.D. thesis.
Supervisor(s):Bridgeman, John and Sterling, Mark and Baker, Andrew
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Civil Engineering
Subjects:QD Chemistry
TA Engineering (General). Civil engineering (General)
Institution:University of Birmingham
ID Code:3887
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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