Anaerobic decolorization and detoxification of cationic red X-GRL by <i>Shewanella oneidensis</i> MR-1 Qian Li Xiao-Li Feng Ting-Ting Li Xue-Rong Lu Qiu-Yue Liu Xue Han Yu-Jie Feng Zhao-Ying Liu Xi-Jia Zhang Xiang Xiao 10.6084/m9.figshare.5249029.v1 https://tandf.figshare.com/articles/journal_contribution/Anaerobic_decolorization_and_detoxification_of_cationic_red_X-GRL_by_i_Shewanella_oneidensis_i_MR-1/5249029 <p>The ability of an electrochemically active bacterium, <i>Shewanella oneidensis</i> MR-1, to decolorize azo dye cationic red X-GRL (X-GRL) was investigated. <i>S. oneidensis</i> MR-1 showed a high decolorization capability for X-GRL under anaerobic conditions. The Mtr respiratory pathway was proved to be involved in the extracellular decolorization of X-GRL. The decolorization efficiency of <i>S. oneidensis</i> MR-1 was significantly inhibited when the initial X-GRL concentration was over 200 mg L<sup>−1</sup>. Increasing the inoculum volume of <i>S. oneidensis</i> MR-1 could obviously promote the X-GRL decolorization. The 100 mg L<sup>−1</sup> X-GRL and 6% (v/v) inoculum volume were chosen as the optimal parameter. Under such a condition, almost all of X-GRL (100 mg L<sup>−1</sup>) could be completely reduced after 12-h incubation at the pH range of 5.5–8.0 and temperature range of 30–40°C. Salinity in the medium also affected X-GRL decolorization. Lactate and citric acid were found to be the suitable electron donors for X-GRL decolorization. Although the genotoxicity increased slightly, the phytotoxicity of X-GRL in the decolorization process was significantly reduced by <i>S. oneidensis</i> MR-1.</p> 2017-07-27 10:04:40 Biodecolorization anaerobic reduction Shewanella oneidensis MR-1; decolorization efficiency cationic red X-GRL