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At the phylum level, the dominant groups with more than 1% of relative abundance in Raw water samples were Proteobacteria, Bacteroidetes, and Actinobacteria, accounting for 86.03, 4.73, and 3.99%, respectively, as shown in Table 3. Proteobacteria accounted for the highest proportion in raw water, due to the fact that Proteobacteria are more adaptable to environmental conditions and are prone to regrowth after the ultrafiltration process. The diversity of ‘5TP’ in tea polyphenols disinfected water samples decreased at the phylum level, and the predominant community was Proteobacteria, which increased from 86.03% of the raw water to 96.63% after disinfection. The proportions of Bacteroidetes, Actinobacteria, and Nitrospirae in the tea polyphenols disinfected water samples were significantly reduced, as shown in Table 3.

Table 3

Percentage of major species at the phylum level (%)

Flora speciesRaw5TP
Proteobacteria 86.03 96.63 
Bacteroidetes 4.73 0.05 
Actinobacteria 3.99 0.16 
Nitrospirae 0.24 0.07 
Others 5.01 3.09 
Flora speciesRaw5TP
Proteobacteria 86.03 96.63 
Bacteroidetes 4.73 0.05 
Actinobacteria 3.99 0.16 
Nitrospirae 0.24 0.07 
Others 5.01 3.09 

Note: Raw stands for raw water; 5TP stands for 5 mg/L polyphenols in disinfected water samples.

The relative abundance of bacterial communities in raw water samples (Raw) and tea polyphenols disinfected water samples (5TP) at the class level is shown in Figure 4, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Flavobacteriia, and Actinobacteria with relative abundance greater than 1% of raw water, accounting for 32.35, 28.32, 25.10, 4.54, and 3.99%, respectively. After disinfection with tea polyphenols, the proportion of the dominant group of bacteria increased to 49.74% for Alphaproteobacteria and 37.91% for Betaproteobacteria, while the proportion of Gammaproteobacteria decreased to 8.76%. The relative abundances of Flavobacterium and Actinobacteria were also reduced to 0.03 and 0.15%, respectively, indicating that tea polyphenols have a significant selective inhibitory effect on Flavobacterium, Actinobacteria, and Gammaproteobacteria.

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