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. 2018 Sep 17;11:250. doi: 10.1186/s13068-018-1255-0

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — a Effects of G22 bioflocculant dosage on the removal of different concentration dye solutions. Microscopic view of CBBR-250 dye before (b) and after (c, d) bioflocculation. Different dosages of bioflocculants (25–500 mg L⁻¹) were added to 40 mL of each dye solution at the concentrations of 25, 50 and 100 mg L⁻¹ with 1 mL of 10% CaCl₂ solution. Values represent mean ± SDs (n = 4)