Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric Fields
The paper investigated studies on the application of pulsed electric fields for the treatment of liquid media in a continuous manner in a co-field treatment chamber with elliptic insulator profiles. The electric field distribution and the temperature rise in the treatment chamber were evaluated via...
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MDPI AG
2020-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/12/4071 |
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| author | Khanit Matra Pattakorn Buppan Boonchai Techaumnat |
| author_facet | Khanit Matra Pattakorn Buppan Boonchai Techaumnat |
| author_sort | Khanit Matra |
| collection | DOAJ |
| description | The paper investigated studies on the application of pulsed electric fields for the treatment of liquid media in a continuous manner in a co-field treatment chamber with elliptic insulator profiles. The electric field distribution and the temperature rise in the treatment chamber were evaluated via the finite element method. A non-uniform electric field was found at the elliptical insulator edges, while the electric field distribution on the insulator surface was rather uniform. The maximum temperature rise in the liquid media was located slightly behind the elliptic insulator due to the accumulated heat in the flowing liquid media. In the optimized treatment chamber, the average electric field intensity could be as high as 12.21 kV/cm at the moderate voltage at 7.5 kV. As a strategy to improve the inactivation while limiting the temperature rise, a series of treatment chambers was verified by experiments under the conditions of 7.5 kV, a 2.5% duty cycle, and 250 Hz. It was found that an increase in the treatment units could increase the inactivation efficiency for <i>Escherichia coli</i>. The average log reduction could be improved from 1.82 to 2.39 when the number of treatment units was increased from 1 to 5, respectively. |
| first_indexed | 2024-03-10T19:13:25Z |
| format | Article |
| id | doaj.art-c54866d9c6d347508f2838f1cad3eed8 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T19:13:25Z |
| publishDate | 2020-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c54866d9c6d347508f2838f1cad3eed82023-11-20T03:38:34ZengMDPI AGApplied Sciences2076-34172020-06-011012407110.3390/app10124071Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric FieldsKhanit Matra0Pattakorn Buppan1Boonchai Techaumnat2Department of Electrical Engineering, Engineering Faculty, Srinakharinwirot University, Ongkharak, Nakhon Nayok 26120, ThailandDepartment of Health Promotion, Faculty of Physical Therapy, Srinakharinwirot University, Ongkharak, Nakhon Nayok 26120, ThailandDepartment of Electrical Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, ThailandThe paper investigated studies on the application of pulsed electric fields for the treatment of liquid media in a continuous manner in a co-field treatment chamber with elliptic insulator profiles. The electric field distribution and the temperature rise in the treatment chamber were evaluated via the finite element method. A non-uniform electric field was found at the elliptical insulator edges, while the electric field distribution on the insulator surface was rather uniform. The maximum temperature rise in the liquid media was located slightly behind the elliptic insulator due to the accumulated heat in the flowing liquid media. In the optimized treatment chamber, the average electric field intensity could be as high as 12.21 kV/cm at the moderate voltage at 7.5 kV. As a strategy to improve the inactivation while limiting the temperature rise, a series of treatment chambers was verified by experiments under the conditions of 7.5 kV, a 2.5% duty cycle, and 250 Hz. It was found that an increase in the treatment units could increase the inactivation efficiency for <i>Escherichia coli</i>. The average log reduction could be improved from 1.82 to 2.39 when the number of treatment units was increased from 1 to 5, respectively.https://www.mdpi.com/2076-3417/10/12/4071pulsed electric fieldco-field treatment chamberelliptic insulator<i>Escherichia coli</i>microbial inactivationseries electrodes |
| spellingShingle | Khanit Matra Pattakorn Buppan Boonchai Techaumnat Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric Fields Applied Sciences pulsed electric field co-field treatment chamber elliptic insulator <i>Escherichia coli</i> microbial inactivation series electrodes |
| title | Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric Fields |
| title_full | Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric Fields |
| title_fullStr | Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric Fields |
| title_full_unstemmed | Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric Fields |
| title_short | Analytical and Experimental Studies on the Application of a Series of Treatment Chambers for <i>Escherichia coli</i> Inactivation by Pulsed Electric Fields |
| title_sort | analytical and experimental studies on the application of a series of treatment chambers for i escherichia coli i inactivation by pulsed electric fields |
| topic | pulsed electric field co-field treatment chamber elliptic insulator <i>Escherichia coli</i> microbial inactivation series electrodes |
| url | https://www.mdpi.com/2076-3417/10/12/4071 |
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