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Nitrogen removal performance and thermodynamic mechanisms of Feammox mediated by ferric pyrophosphate at various pHs
Wang, Jiaqi1,2,3,4; Song, Cheng1,4; Huo, Lixin1,2,3,4; Wang, Xingzu1,2,4,6; Liu, Hong1,2,4,6; Zhang, Xiaomei5
2024-02-01
摘要Fe(III) reduction coupled with anaerobic ammonium oxidation (Feammox) is an emerging nitrogen removal process that is favored under moderately acidic conditions, yet its performance and mechanisms in neutral and alkaline conditions are poorly understood. Ferric pyrophosphate (FP) with a non-redox active ligand was selected as a typical chelated iron to study the performance and thermodynamics of Feammox at various pH levels. Ammonia removal efficiency increased from 18.1 % at pH 5.0 to 40.1 % at pH 7.0 but dropped to 2.6 % at pH 9.0. Thermodynamic studies revealed that FP-mediated Feammox was the dominant ammoxidation process at pH > 4.97. X-ray diffraction and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) demonstrated that FP-mediated Feammox led to the precipitation of vivianite (Fe-3(PO4)(2)8H(2)O) in the sludge, thus facilitating phosphorus removal from the water. XPS indicated the presence of Fe(III) and Fe(II) in secondary minerals. 16S rRNA sequencing identified the dominant bacterial genera in the enriched sludges; these included norank_f_A4b, Arenimonas, and Limnobacter. This study improves our understanding of Feammox over a wide pH range and highlights the importance of Fe(III)-ligand complexes in this process.
关键词Feammox Ferric pyrophosphate Thermodynamics analysis Sulfate reduction Chelated iron
DOI10.1016/j.jwpe.2024.104864
发表期刊JOURNAL OF WATER PROCESS ENGINEERING
ISSN2214-7144
卷号58页码:10
通讯作者Wang, Xingzu(wangxingzu@cigit.ac.cn) ; Liu, Hong(liuhong@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001176277000001
语种英语