Control of Disinfection By-Products (DBP's) in Drinking Water Distribution Systems

Project: Research project

Project Details

Description

Control of Disinfection By-Products (DBP's) in Drinking Water Distribution Systems Control of Disinfection By-Products (DBP's) in Drinking Water Distribution Systems The objectives of the proposed study are (I) to evaluate pilot-scale photocatalysis and enhanced coagulation for their ability to remove or destroy disinfection byproduct (DBP) precursors, DBPs including total trihalomethanes (TTHMs) and five haloacetic acids (HAA5), and DBP formation potential (FP) in Arizona surface waters, and (2) to investigate the characteristics of natural organic matters which have the greatest impact on the formation ofDBPs. The proposed experimental design consists of three tasks. During the first task, untreated central Arizona surface water from the Salt River and Central Arizona Project (CAP) Canal will be used to evaluate and compare the efficacy ofDBP precursor removal using photocatalysis and enhanced coagulation. In addition to the two untreated source waters, water samples will be collected at different stages in the water treatment process, including following sedimentation and following filtration. During the second task, removal efficacy ofDBPs such as TTHMs and HAA5 using photocatalysis and enhanced coagulation will be evaluated. Water from a distribution "hot spot" will also be tested. Following treatment, the waters will be rechlorinated using chlorine and chloramines to evaluate the DBP formation potential in the treated water. During the last task, DBP formation as a function of size and composition fractionation will be explored in an attempt to identify the characteristics of natural organic matter that have the greatest impact on the formation ofDBPs. This study aims to address different treatment scenarios using a pilotscale Ti02 photocatalysis reactor to treat central Arizona surface waters. Enhanced coagulation has also been included as a point of comparison as it has been identified as the best available technology for DBP mitigation. This study provides information on the pilotscale energy requirements necessary to achieve DBP precursor reductions (i.e., DOC, UV254 etc.), organic mineralization, and a reduction in DBPs (i.e., TTHMs and HAA5) and DBP formation potential.
StatusFinished
Effective start/end date3/1/095/31/11

Funding

  • OTHER: Arizona Public University (ABOR): $60,000.00

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