《Table 1–Properties of granules at different phases in two reactors.》

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《The key role of inoculated sludge in fast start-up of sequencing batch reactor for the domestication of aerobic granular sludge》

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As shown in Table 1，the settling performance of AGS in the R1reactor was improved，and the SVI decreased from 45.16 for the seed sludge to 35.27 mL/g at day 54.Meanwhile，the settling velocity increased from 37.8 to 60.48 m/hr.By contrast，the SVI in R2 reactor showed a gradual increase from the beginning of operation to day 22，and finally stayed steady at60.24 mL/g.The values of settling velocity in the R1 and R2reactors at day 22 were 57.6 and 41.1 m/hr，respectively，and the settling velocity in R2 was lower than in R1 throughout.A study showed that sedimentation performance is good when the settling velocity is 50–100 m/hr（Winkler et al.，2012）.It seemed that the excellent settleability ensured the retention of AGS within the R1 reactor（He et al.，2018）.Therefore，the MLSS of granules in the R1 reactor was higher than that of those in the R2 reactor.The moisture content in the R1 reactor showed a stable trend，while that in the R2 reactor showed a slight decrease.However，the moisture content in the R1reactor was lower than that in the R2 reactor.The effect of the hydrophobicity of seed sludge on the aerobic granules was found to be significant，which conforms with the granulation process；this may be explained by the cell surface hydrophobicity hypothesis（Song et al.，2010）.