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Τime planning and costing of the upgrade project of the Wastewater Treatment Plant (WWTP) of Marpissa, Paros

Melissaropoulou Vasiliki

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Year 2022
Type of Item Diploma Work
Bibliographic Citation Vasiliki Melissaropoulou, "Τime planning and costing of the upgrade project of the Wastewater Treatment Plant (WWTP) of Marpissa, Paros", Diploma Work, School of Chemical and Environmental Engineering, Technical University of Crete, Chania, Greece, 2022
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The purpose of this dissertation is the time planning of the upgrade project of the Wastewater Treatment Plant (WWTP) of Marpissa, Paros using the PERT and CPM methods, as well as the costing of the work for the conduction of the project. The proposed project aims at the upgrading of the WWTP of Marpissa, through the application of innovative technologies in waste water treatment. After the completion of this project, the WWTP of Marpissa will be able to accept increased input load, while simultaneously decreasing its energy requirements and operating costs. The novelty of the project is attributed to the early removal of solids and particulate BOD from the effluent, using special type filtration systems (microwaves / self-cleaning upward flow sand filters), before they enter the aeration tank. Thus, a reduction of the total electricity consumption of WWTP is estimated at about 30-35%. In the future, the treated wastewater will be used for irrigation of forest area, without harming the environment with harmful substances.Initially for the theoretically background, an extensive bibliographical review was attempted regarding the definition of the project, its management and circle of life, the time planning and the two methodologies that will be used, as well as the various processes that follow the liquid waste through a WWTP. A detailed description of the conditions in the existing facility and of the proposed project follows, with the aim of emphasizing the importance of the project.The part that follows, which is most important part of the dissertation, contains the network analysis of both CPM and PERT methodologies. In CPM methodology, the project consists of activities with known completion times; while in PERT, conditions of uncertainty prevail.The proposed project consists of 36 sub-activities, which are grouped into three (3) categories; the study and design of the project, the construction site installation and the implementation of innovation and construction in WWTP of Marpissa. The overall deadline for the execution of the project is 729 days. Based on calculations that were made in the CPM method, the minimum completion time was determined at 661 days, while in PERT, 665,8 days. According to the sensitivity analysis, which was carried out immediately after, the probability of completion of the project in less than 666 days is 1%, while the probability of its completion in a later period than 666 days is 99%. Through the analysis of the costs of the project, the total cost of the project emerges, which amounts to 287.030€.Finally, there are comments and conclusions of this study, as the annexes describe in a few words the MS Project program, which was used for verifying the calculations of the time planning.

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