Abstract
Abstract Wastewater treatment plants (WWTPs) contain a large number of components, and these components in turn require a large number of maintenance activities and high costs. In this paper, a Fuzzy-based Multi-Criteria Decision Support System (FBMCDS) model was designed based on the failure mode and effect analysis FM-EA and applied to the Rustumiya Project (RP) in Iraq. Information of the RP’s components, failure modes, applied maintenance activities and costs were collected from the documented data, site visit and face-to-face interviews as well as opinions of 44 experts. Through applying the fuzzy logic to analysis the failure modes and effects, the risk priority index (FMRPI) and total intensity (FMTI) of each failure mode ware computed. Thus, maintenance priorities and weights of the RP’s failure modes were specified. In addition, the best maintenance plan was specified based on the FMRPI-FMTI diagram that shows the importance and the type of maintenance required for each failure mode. Failure of the submersible pump has the first rank in terms of priority, while the last priority was occupied by the building failure mode, where the mechanical failure modes are of the highest importance, followed by the electrical failure modes. Finally, the construction failure modes are ranked last due to the small probability of failure. The designed model is considered an efficient tool due to the similarity of the results with the reality of the situation and the ease of reading and displaying the results. In addition, this model can be applied to other projects such as water treatment plants and irrigation projects.
Highlights
The world is facing rapid and huge developments in various aspects of life, which makes the major resources granted by mother earth insufficient and destined to regression
The Fuzzy-based Multi-Criteria Decision Support System FBMCDS model was designed to include the F-failure mode and effect analysis (FM-EA) which is computed through calculating the FMRPI and Failure Mode Total Intensity (FMTI) for each failure mode, applied to the data collected from different sources, which ended with prioritizing failure modes and suggesting the best maintenance plan
The detailed examination of the components of Rustumiya Project (RP) wastewater treatment plants (WWTPs) resulted in defining the failure modes of the RP WWTP, Table 14 illustrates the mechanical, electrical, and construction failure modes specified according to the reviewed documents, site visit and direct interviews, in addition to the information collected from the plant's data, and the operation and maintenance manuals
Summary
The world is facing rapid and huge developments in various aspects of life, which makes the major resources granted by mother earth insufficient and destined to regression. We as human beings live and die on earth it is our duty to take care of its resources, knowledge about the quality of water resources is a significant need to preserve and control their consumption [1], it can be inferred that most of the water bodies around the world are diminishing. One of the most important solutions to control the quantities of water used and the quality of water returned to water resources is the wastewater treatment plants (WWTPs). WWTPs get rid of large quantities of suspended and dissolved solids, in addition to a high percentage of organic matter through a series of activities (physical, chemical, and biological) that end with an acceptable water quality within the rules and regulations that differs in every region in the world. A large proportion of consumed water returns to its original water body with an acceptable water quality. The process of developing projects to the modern state and adopting machines and automation instead of manpower
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