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. 2018 Oct 25;8:15793. doi: 10.1038/s41598-018-34183-3

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The concentration of LB-EPS (a) and TB-EPS (b) across the granulation process. The PS to PN ration of LB-EPS (c) and TB-EPS (d) and TB-EPS to LB-EPS ratio (e) during the operation period. Error bars represent standard deviation of three technical replicates. (f) Add-back of 5000 nM C8-HSL and C10-HSL increased the EPS production of anaerobic sludge. Two-way ANOVA was conducted and Bonferroni post-tests were performed to compute the significance. *P < 0.05, **P < 0.01 and ***P < 0.001 were used to indicate different significance.