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Investigation of upgrading wastewater treatment facilities with primary filtration systems

Maniaki Ioanna

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Summary

The present thesis aims to investigate the upgrading of Wastewater Treatment Plants (WWTPs) with primary filtration systems (microscreens followed by Continuous Upflow Media Filters, CBUMFs), within the framework of the project " Upgrade of WWTPs for the management of increased demands and the reduction of the operational cost (ANELIXI)." The thesis was conducted at the Design of Environmental Processes Laboratory of the School of Chemical Engineering and Environmental Engineering at the Technical University of Crete, under the supervision of Professor Petros Gikas. The ANELIXI project aims to implement innovative technology for upgrading overloaded WWTPs in Greece and Cyprus, with low energy and operating cost. To investigate the implementation of the ANELIXI project technology, a questionnaire was created to identify the needs of existing WWTPs in Greece and Cyprus, the determining specific parameters for integrating the technology into existing facilities, and expressing interest in adopting/integrating the ANELIXI project technology. The project ANELIXI aims to implement innovative technology for upgrading overloaded Wastewater Treatment Plants (WWTPs) in Greece and Cyprus, with reduced energy and operating costs. To investigate the adoption of ANELIXI project technology, a questionnaire was created to identify the needs of existing WWTPs in Greece and Cyprus, determine specific integration parameters of the technology into existing facilities, and express interest in the absorption/integration of ANELIXI project technology. Information and data collection were conducted through an extensive questionnaire sent to a total of one hundred forty-three (143) WWTPs in Greece and Cyprus. The examined sample of this thesis consisted of sixteen (16) WWTPs in Greece and four (4) WWTPs in Cyprus, with Equivalent Population (EP) ranging from 3,000 to 90,000 inhabitants in Greece and from 11,000 to 275,000 inhabitants in Cyprus. The range of influent flow rate was from 300 to 30,000 m3 /d for Greek WWTPs and from 500 to 29,000 m3 /d for Cypriot WWTPs, respectively. The primary method of secondary treatment in both Greece and Cyprus is extended aeration, with 65% of Greek WWTPs and 64% of Cypriot WWTPs choosing this method, based on the examined sample. The average electricity consumption per cubic meter of influent wastewater in Greek WWTPs was calculated from 0.28 to 0.96 kWh/m3 , while in Cyprus, it ranged from 0.61 to 1.87 kWh/m3 . Overloading is a common challenge for WWTPs in both countries. In Greece, 87% of WWTPs reported cases of overloading, while in Cyprus WWTPs, the percentage reached 50%. The majority of WWTPs both Greece and Cyprus expressed interest in adopting the primary treatment systems of the ANELIXI project. This attitude underscores the recognition of the benefits offered by technologies of the ANELIXI’s project to both new and existing WWTPs, while simultaneously contribute to the development of new wastewater treatment technologies with low cost and energy requirements. Therefore, this project is presented as a catalyst for the modernization of conventional wastewater treatment processes, emphasizing the urgent need for continuous advancements in the wastewater management sector.

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