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. 2015 Nov 30;6:1337. doi: 10.3389/fmicb.2015.01337

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Copyright © 2015 Li, Rui, Yao, Zhang, Yan, Wang, Yan and Li.

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) or licensor 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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The heatmap showing the correlations of relative abundance of various phyla (A) and genera (B) with available operational parameters. The phyla and genera with average relative abundances of higher than 0.1% and 0.3%, respectively, were listed. SRT, sludge retention time; T, digester temperature; COD, chemical oxygen demand; FA, free ammonia; C:N, ratio of COD/ ${NH}_{4}^{+} - N$ . **p < 0.01, *p < 0.05.