Promoting nitrogen removal during Fe(III) reduction coupled to anaerobic ammonium oxidation (Feammox) by adding anthraquinone-2, 6-disulfonate (AQDS). (April 2019)

• Record Type: Journal Article
• Authors: Yang, Yafei; Peng, Hong; Niu, Junfeng; Zhao, Zhiqiang; Zhang, Yaobin
• Is Part Of: Environmental pollution. Volume 247(2019)
• Page Start: 973
• Page End: 979
• Publication Date: 2019-04
• Subjects: Feammox -- AQDS -- Nitrogen loss -- Fe(III)/Fe(II) cycle -- Anaerobic digestion; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2019.02.008
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Feammox, i.e., Fe(III) reduction coupled to anaerobic ammonium oxidation, is a potential alternative to ammonium removal in natural and artificial ecosystems. However, the efficiency of Feammox is quite low to restrain its practical application in wastewater/solid disposal. In this study, three batch experiments, including control (Fe2 O3 /AQDS-free), Fe2 O3 group (25 mM Fe2 O3 only) and AQDS-Fe2 O3 group (25 mM Fe2 O3 and 0.6 mM AQDS), were conducted in 200 mL serum vials to explore whether AQDS can promote Feammox. Results showed that the nitrogen removal efficiency of the AQDS-Fe2 O3 group was 82.6%, compared with 64.3% of the Fe2 O3 group and 46.0% in the control. AH2 QDS, the reduced state of AQDS, was detected in the AQDS-Fe2 O3 group. Another experiment indicated that AH2 QDS was oxidized back to AQDS by Fe2 O3 . These results suggested that AQDS/AH2 QDS had been serving as electron shuttles between ammonium and Fe2 O3 to successively forward the oxidation of NH4 + . X-ray diffraction analysis showed that new Fe(III) species were found in the systems, implying that a Fe(II)/Fe(III) cycle also occurred. In agreement, both iron-reducing and oxidizing bacteria were detected in the systems. Graphical abstract: Image 1 Highlights: Nitrogen removal rate increased by 18.3% by adding AQDS. New Fe(III) species were found after experiment. NOx − -dependent Fe(II) oxidation likely occurred. AH2 QDS was detected in the AQDS-Fe2 O3 group. Iron-reducing and oxidizing bacteria were both detected.