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• W45339841 abstract "Management of wastewater treatment plants has become a major environmental and economic concern in North America because of the unprecedented deterioration of these facilities. This situation is aggravated by the lack of adequate funds for upgrading and maintenance. In 2008, Statistics Canada estimated that wastewater treatment assets have exceeded 63% of their useful life, the highest level among public infrastructure facilities. Similar studies in the United States found current wastewater treatment facilities with a near-failure average grade of D-. These facts show the urgent need for rehabilitation decision tools to keep these facilities running effectively. This dissertation aims to respond to such a pressing need by developing a performance assessment model (PAM) for the maintenance and rehabilitation of wastewater treatment plants (WWTPs) that depends on various treatment and infrastructure aspects. The developed PAM is based on the evaluation of both treatment and infrastructure performance for the main treatment phases of a WWTP. The treatment performance of each phase is based on efficiency of treatment and robustness of its parameters as set by design standards. The infrastructure performance of each treatment phase is determined using infrastructure condition rating models developed by integrating the multi-attribute utility theory (MAUT) and the analytic hierarchy process (AHP).The required data for these models were collected via questionnaires from, site visits to, and interviews with experts in Canada and the United States. The results reveal that physical factors have the highest impact on deterioration of WWTP infrastructure and that pumps are the most vulnerable infrastructure unit. Deterioration curves for different infrastructure units in a WWTP are generated using sensitivity analysis, which shows the effect of age over their condition rating indexes. The treatment and infrastructure performance indexes are merged and presented in a combined condition rating index. Integer programming approach is used to optimize the rehabilitation interventions within available budget constraints with a minimum desired condition rating for each infrastructure unit.The developed PAM is validated using data of three WWTPs from Canada and the United States. Managers of these WWTPs acknowledged the efficacy of the developed model outputs and deemed it systematic, straightforward, and valuable for clearly pinpointing the main problems in these WWTPs." @default.
• W45339841 created "2016-06-24" @default.
• W45339841 creator A5073748026 @default.
• W45339841 date "2011-05-06" @default.
• W45339841 modified "2023-09-27" @default.
• W45339841 title "Performance Assessment Model for Wastewater Treatment Plants" @default.
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