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The accelerating effect of non-dissolved redox mediator (1,5-dichloroanthraquinone) on the biological denitrification was investigated in this paper using 1,5-dichloroanthraquinone immobilized by calcium alginate (CA) and a heterotrophic denitrification bacterium of Paracoccus versutus (GU111570). The results suggested that the denitrification rate was enhanced 2.1 fold by 25 mmol l(-1) 1,5-dichloroanthraquinone of this study, and a positive correlation was found for the denitrification rate and 1,5-dichloroanthraquinone concentrations from 0 to 25 mmol l(-1). According to the change characteristic of NO(3) (-) and NO(2) (-) during the denitrification process, the tentative accelerating mechanism of the denitrification by redox mediators was put forward, and redox mediator might play the role of reduced cofactors like NADH, N(A)DH and SDH, or the similar ubiquinol/ubiquinone (Q/QH(2)) role during the denitrification process.

Citation

Huijuan Liu, Jianbo Guo, Jiuhui Qu, Jing Lian, William Jefferson, Jingliang Yang, Haibo Li. Catalyzing denitrification of Paracoccus versutus by immobilized 1,5-dichloroanthraquinone. Biodegradation. 2012 Jun;23(3):399-405

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PMID: 22086549

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