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. 2019 Jul 16;9:109. doi: 10.1186/s13568-019-0827-0

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© The Author(s) 2019

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.

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Fig. 3 — Microbial DOC degradation rates as a function of depth in the BAC filters. Depth 0 corresponds to the top of the filter bed. Data depict means and standard deviations of three parallel incubations. Filters 1 and 2 are filled with granular activated carbon whereas filter 3 is filled with extruded activated carbon