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Effects of different quinoid redox mediators on the removal of sulphide and nitrate via denitrification |
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| Authors: | Aranda-Tamaura Clicerio Estrada-Alvarado María Isabel Texier Anne-Claire Cuervo Flor Gómez Jorge Cervantes Francisco J |
| Institution: | aDepartamento de Ciencias del Agua y del Medio Ambiente, Instituto Tecnológico de Sonora, Av. 5 de Febrero 818 Sur, Cd. Obregón, Sonora 85000, Mexico bDepartamento de Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Av. 5 de Febrero 818 Sur, Cd. Obregón, Sonora 85000, Mexico cDepartamento de Biotecnología, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Iztapalapa 09340, Mexico dDivisión de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICyT), Camino a la Presa San José 2055, Col. Lomas 4a, Sección, C.P. 78216, San Luis Potosí, SLP, Mexico |
| Abstract: | The impact of different quinoid redox mediators on the simultaneous conversion of sulphide and nitrate in a denitrifying culture was evaluated. All quinones evaluated, including anthraquinone-2,6-disulphonate (AQDS), 2-hydroxy-1,4-naphthoquinone and 1,2-naphthoquinone-4-sulphonate (NQS) were reduced by sulphide under abiotic conditions. NQS showed the highest reduction rate by sulphide (132 μmol h?1) and promoted the maximum rate of sulphide oxidation (87 μmol h?1) by denitrifying sludge, which represents an increase of 44% compared to the control lacking quinones. The reduced form of AQDS (AH2QDS) served as an electron donor for the microbial reduction of nitrite and N2O, which represents the first demonstration of hydroquinones supporting the microbial reduction of denitrifying intermediates. The results taken as a whole suggest that some quinones may significantly increase the rate of removal of S and N under denitrifying conditions. |
| Keywords: | Denitrification Humus Quinones Sulphide Wastewater |
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