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. 2019 Oct 23;10:2418. doi: 10.3389/fmicb.2019.02418

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Copyright © 2019 Fu, Jin, Conrad, Liu and Liu.

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(s) 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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Time course of accumulated (A) CH₄, (B) δ¹³C of CH₄, (C) acetate, (D) δ¹³C of acetate, (E) CO₂, (F) δ¹³C of CO₂, (G) H₂ concentration, and (H) pH during the treatment of sewage sludge at 30°C, BES as an inhibiter of methanogenesis. The δ¹³C of the sludge organic matter (−29.8‰) was represented by dotted line. Mean ± SD, n = 3.