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Non-ohmic electrical fringe field selective to biofilm suitable for addressing biofouling in wastewater treatment
- Title
- Non-ohmic electrical fringe field selective to biofilm suitable for addressing biofouling in wastewater treatment
- Authors
- Lee, Donghyun; Lee, Jeongeun; Lim, Hyun Jeong; Yoon, Yeomin; Chua, Beelee; Son, Ahjeong
- Ewha Authors
- 손아정
- SCOPUS Author ID
- 손아정
- Issue Date
- 2023
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- ISSN
- 1385-8947
1873-3212
- Citation
- CHEMICAL ENGINEERING JOURNAL vol. 454
- Keywords
- Biofilm; Electrical fringe field; Attached growth systems; Non-ohmic; Wastewater treatment
- Publisher
- ELSEVIER SCIENCE SA
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- The non-ohmic electrical fringe field has been shown to be a viable approach for addressing biofouling in wastewater treatment. Existing attached growth systems require periodic mechanical-or chemical-based maintenance or part replacement to regulate excessive biofilm formation. The proposed electrical approach uses a non-ohmic fringe field at a low voltage of 10 V and a low frequency of 100 kHz, where bacterial biofilm growth is noticeably reduced. The fringe field was generated by insulated interdigitated electrodes embedded below the surface on which the biofilm grew. Electric field simulation showed field strength of 15.2 and 12.3 V/ cm at 0.05 and 1 mm from the surface, respectively, which are sufficient to reduce biofilm growth. As the biofilm grows, the fringe field passing through it becomes denser (hence, higher field strength) owing to the difference in relative permittivity. It selectively targeted biofilms in water. The optical density measurements showed that the presence of fringe field was able to reduce the biofilm by-10.1 % as compared to the control. Adenosine triphosphate measurements suggested that the effect of fringe field on bacterial viability was even more pro-nounced at-20.6 % reduction. This is an efficient approach with no moving parts suitable for uninterrupted biofilm growth regulation in wastewater treatment.
- DOI
- 10.1016/j.cej.2022.140020
- Appears in Collections:
- 공과대학 > 환경공학과 > Journal papers
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