Journal
MEMBRANES
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/membranes12100965
Keywords
NaOCl cleaning; PVDF hollow fiber membrane; physicochemical properties; membrane fouling behavior
Categories
Funding
- Guangdong Basic and Applied Basic Research Foundation [2022A1515010731]
- Science and Technology Program of Guangzhou [202102080181]
- Guangzhou Jinrongtao Environmental Protection Technology Co., Ltd. [HT-99982020-0138]
Ask authors/readers for more resources
This study investigated the effects of NaOCl dose and solution pH on the properties of PVDF ultrafiltration membranes. The results showed that membrane pores increased with exposure time prolonging, and more pores were observed at pH 8 aging condition. Different chemical groups were formed under different pH conditions. The hydrophilicity and pure water permeability of the membranes had slight changes during NaOCl aging process. The antifouling properties of some membranes were slightly improved, while others showed severer flux decline with humic acid filtration.
Sodium hypochlorite (NaOCl) is a commonly used cleaning agent for recovering membrane performance in membrane technologies. A thorough understanding of the impacts of NaOCl exposure on membrane properties and fouling behavior is important for optimizing chemical cleaning process and extending membrane lifespan. In this study, three commercial polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membranes (SMM-1010, MEMCOR(R) CS II and ZeeWeed 500) were used to systematically explore the effects of NaOCl dose and solution pH (8 and 10) on membrane properties. The results showed that membrane pores increased with exposure time prolonging, and more pores were observed at pH 8 aging condition. The amide group in the Fourier transformation infrared spectra was disappeared, while the carboxylic acid and succinimide groups were formed at pH 10 and pH 8 conditions, respectively. The hydrophilicity and pure water permeability (PWP) of SMM-1010 and MEMCOR(R) CS II membranes had insignificant changes during NaOCl aging process, whereas the hydrophilicity of ZeeWeed 500 membrane slightly decreased and its PWP increased by 1.4-fold. The antifouling properties of NaOCl-aged SMM-1010 and MEMCOR(R) CS II membranes were slightly improved, whereas the NaOCl-aged ZeeWeed 500 membrane showed severer flux decline with humic acid filtration. Our findings could provide guidance for practical chemical cleaning process optimization.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available