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- W4328129502 abstract "Abstract Reverse osmosis (RO) is widely used in wastewater reclamation to alleviate the increasingly global water shortage. However, it has an inconvenient defect of biofouling. Some disinfection processes have been reported to select certain undesirable disinfection-residual bacteria (DRB), leading to severe long-term biofouling potential. To provide constructive guidance on biofouling prevention in RO systems, this study performed a 32-day experiment to parallelly compared the biofouling characteristics of RO membranes of DRB after five mature water disinfection methods (NaClO, NH 2 Cl, ClO 2 , UV, and O 3 ) and two recently developed water disinfection methods (K 2 FeO 4 and flow-through electrode system). As a result, the DRB biofilm of K 2 FeO 4 and O 3 caused a slight normalised flux drop (22.4 ± 2.4% and 23.9 ± 1.7%) of RO membrane compared to the control group (non-disinfected, ~27% normalised flux drop). FES, UV, NaClO and ClO 2 caused aggravated membrane flux drop (29.1 ± 0.3%, 33.3 ± 7.8%, 34.6 ± 6.4%, and 35.5 ± 4.0%, respectively). The biofouling behaviour showed no relationship with bacterial concentration or metabolic activity ( p > 0.05). The thickness and compactness of the biofilms and the organics/bacterial number ratio in the biofilm, helped explain the difference in the fouling degree between each group. Moreover, microbial community analysis showed that the relative abundance of typical highly EPS-secretory and biofouling-related genera, such as Pseudomonas , Sphingomonas , Acinetobacter , Methylobacterium , Sphingobium , and Ralstonia , were the main reasons for the high EPS secreting ability of the total bacteria, resulting in aggravation of biofouling degree ( p < 0.05). All types of disinfection except for NaClO and ClO 2 effectively prevented pathogen reproduction in the DRB biofilm." @default.
- W4328129502 created "2023-03-22" @default.
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- W4328129502 date "2023-03-21" @default.
- W4328129502 modified "2023-10-15" @default.
- W4328129502 title "Biofouling characteristics of reverse osmosis membranes by disinfection-residual-bacteria post seven water disinfection techniques" @default.
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- W4328129502 doi "https://doi.org/10.1038/s41545-023-00240-2" @default.
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