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. 2021 Mar 16;9(3):611. doi: 10.3390/microorganisms9030611

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Changes in chemical parameters as a function of time within 14 days of two-stage bio-oxidation and control experiment: (A) COD; (B) VFAs; (C) SO₄²⁻; (D) S²⁻. Blue dots refer to data of bio-oxidation using SOB and Bioremoil. Red dots refer control without adding microbial consortia (saturation of the solution with oxygen was kept at 1%from day 0 to 5), then, oxygen level was increased and saturation of the solution with oxygen was kept at 100% from day 6 to 14. Day 0—Inoculation of SOB; day 6—Inoculation of BioRemOil.