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. 2018 Mar 28;9:589. doi: 10.3389/fmicb.2018.00589

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Copyright © 2018 Qin, Wu, Li, Li, Zhang and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Characteristics of anaerobic granular sludge (AGS) of different sampling time points. (A) The mixed liquid suspended solids of sludge. (B) The mixed liquor volatile suspended solids of sludge (biomass). (C) The percentage of sludge volume. (D) The average diameter of granule. Error bar was SD obtained based on the data of five sampling time points, ANOVA analysis of Kruskal–Wallis test was used to analyze variation between different sampling heights, ^∗P < 0.05. NA indicated no analysis.