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Degradation pathways and kinetics of anthraquinone compounds along with nitrate removal by a newly isolated Rhodococcus pyridinivorans GF3 under aerobic conditions

Lu, Hong, Wang, Xiaolei, Zang, Miaomiao, Zhou, Jiti, Wang, Jing, Guo, Wanqian
Bioresource technology 2019 v.285 pp. 121336
aerobic conditions, anthraquinones, catechol, denitrification, dyes, hydrophilicity, hydrophobicity, liquid chromatography, logit analysis, mass spectrometry, metabolites, nitrates, polluted soils, wastewater
A novel Rhodococcus pyridinivorans GF3 capable of degrading anthraquinone compounds (ACs) was isolated from 1-amino-4-bromoanthraquinone-2-sulfonic acid contaminated soil under aerobic conditions. Strain GF3 could degrade nine ACs at 150 rpm and 30 °C. LC-MS analysis showed that ACs were degraded via catechol and salicylic acid-produced pathways, which were different from previously reported phthalic acid-produced pathway. Strain GF3 could also completely remove ACs along with nitrate removal via aerobic denitrification. Further analysis found that the catechol as a metabolite of ACs could contribute to aerobic denitrification. The degradation of the mixture of five ACs used in 1-amino-4-bromoanthraquinone-2-sulfonic acid-producing process followed the modified Gompertz model under aerobic denitrification. During this process, except for anthraquinone (29.5% removal), the degradation efficiencies of hydrophilic and hydrophobic ACs reached over 90% and 60% in 48 h, respectively. These results show that strain GF3 is of potential application for the treatment of anthraquinone dye intermediates-containing wastewaters.