Journal of Water and Wastewater Science and Engineering

Journal of Water and Wastewater Science and Engineering

The Effect of Pulsed Electric Field (PEF) in Deactivating Biological Factors in the Wastewater Process of Conventional Water Treatment Plants

Document Type : Research Paper

Authors
1 Assistant Professor, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Chemistry, Islamic Azad University of Tehran Medical Sciences, Tehran, Iran.
2 M.Sc. Student, Department of Applied Chemistry, Faculty of Pharmaceutical Chemistry, Islamic Azad University of Tehran Medical Sciences, Tehran, Iran.
3 Managing Director and Chairman of the Board of Directors of Aria Mehrgan Medical Equipment Company (METASU), Tehran, Iran.
Abstract
In this article, the biological factors present in the purification process, as well as the formation of side compounds such as trihalomethanes, are examined.  Chlorine together with organic substances in wastewater creates side compounds such as trihalomethanes. By using pulsed electric field (PEF) technology, the inactivation of biological load such as nematodes, diatoms, cyanophyces and chlorophyces was investigated in these wastewaters, which is economical in the long term and also prevents the production of side compounds. In this biological investigation, the effluent from washing the filters of the drinking water treatment plant qualitatively with different voltages in the range of 1 to 13 kV with an interval of 1 kV with a constant frequency of 500 Hz at different times (10, 20, 30, 40, 50 and 60 min) exposed to contact and then qualitatively evaluated under the microscope. This qualitative study showed that the range of 1 to 6 kV has no effect on the biological agents in the wastewater, including nematodes, and the effect of the deactivation of the pulsed electric field (PEF) on the biological agents occurs in the range of 13-6 kV. This research showed that in the PEF system, the type of biological agents, the amount of voltage, contact time and the percentage of inactivation of biological agents in rotifers; 13 kV with a contact time of 60 min, maximum 20%, nematodes; 13 kV with a contact time of 60 min, maximum 25%, diatoms; 11 kV and contact time of 60 min, maximum 75%, chlorophytes; 10 kV and contact time of 60 min, maximum 90% and cyanophyces; 10 kV and a contact time of 60 minutes were effective in inactivating them up to 90%.
Keywords

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Volume 9, Issue 3
Autumn 2024
Pages 42-50

  • Receive Date 30 October 2023
  • Revise Date 29 December 2024
  • Accept Date 21 January 2025