An integrated performance assessment framework for water treatment plants |
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Authors: | Zhang Kejiang Achari Gopal Sadiq Rehan Langford Cooper H Dore Mohammed H I |
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Affiliation: | a Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada b Okanagan School of Engineering, UBC, Kelowna, BC, Canada c Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada d Department of Economics, Brock University, St Catharines, ON, Canada |
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Abstract: | An innovative framework for the performance assessment of a traditional water treatment plant (WTP) is presented that integrates the concepts of reliability, robustness, and Quantitative Microbial Risk Assessment (QMRA). Performance assessment for a WTP comprised of three units (i.e., unit 1: Coagulation/Flocculation and Sedimentation; unit 2: Filtration, and unit 3: Disinfection) was conducted. Performance functions for units 1, 2, and units 1 and 2 combined, were constructed by integrating turbidity robustness indices. Performance function for chlorine disinfection was developed based on the difference between achieved and required CT values. A health-based performance function was developed by comparing the target daily infection rate to the site-specific infection rate. It was used to identify whether the health-based target was met during the failures of units 1 to 3. Results obtained from the proposed performance functions can be used by operators to ensure that multiple barriers perform successfully under variable conditions. |
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Keywords: | Performance assessment Water treatment plant operation and management Reliability Robustness Quantitative Microbial Risk Assessment (QMRA) |
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