Improved anti-biofouling performance of pressure retarded osmosis (PRO) by dosing with chlorhexidine gluconate
- Authors
- Sun, Peng-Fei; Kim, Taek-Seung; Kim, Han-Shin; Ham, So-Young; Jang, Yongsun; Park, Yong-Gyun; Tang, Chuyang Y.; Park, Hee-Deung
- Issue Date
- 1-5월-2020
- Publisher
- ELSEVIER
- Keywords
- Pressure retarded osmosis (PRO); Biofouling; Structural parameter (S); Internal concentration polarization (ICP); Chlorhexidine gluconate (CHG)
- Citation
- DESALINATION, v.481
- Indexed
- SCIE
SCOPUS
- Journal Title
- DESALINATION
- Volume
- 481
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56048
- DOI
- 10.1016/j.desal.2020.114376
- ISSN
- 0011-9164
- Abstract
- Pressure retarded osmosis (PRO) is an emerging technology capable of extracting energy from salinity gradients of wastewater paired with SWRO brine. However, this process's performance is hindered by irreversible bio-fouling due to bacteria-containing wastewater and the sponge-like support layer of PRO membranes. In this study, chlorhexidine gluconate (CHG), a non-oxidizing biocide, was continuously added to feed solution to investigate its anti-biofouling performance during PRO. CHG showed higher anti-microbial and anti-biofilm activity than did other non-oxidizing biocides. Even at low dosages of CHG, water flux declines were greatly mitigated and benefited from the internal concentration polarization (ICP)-elevated concentrations within the active-support layer interface. CHG plays a critical role by inhibiting bacterial growth, and a 65-88% reduction of extracellular polymeric substances was achieved on the membrane surface and throughout the feed spacers. Membrane characterization demonstrated that the improved performance could be attributed to a consistent structural parameter and alleviation of ICP self-compensation effects. This study thus shows that a combination of biocide dosing and pressure assisted-osmotic backwashing can be a useful strategy for controlling biofouling during the PRO process.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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