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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2023, Vol. 17 Issue (6) : 74    https://doi.org/10.1007/s11783-023-1674-4
RESEARCH ARTICLE
Removal of ammonium and nitrate through Anammox and FeS-driven autotrophic denitrification
Yanfei Wang1,2, Xiaona Zheng1,2, Guangxue Wu3, Yuntao Guan1,2()
1. Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
2. State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, China
3. Civil Engineering, School of Engineering, College of Science and Engineering, National University of Ireland, Galway, Galway H91 TK33, Ireland
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Abstract

● Simultaneous NH4+/NO3 removal was achieved in the FeS denitrification system

● Anammox coupled FeS denitrification was responsible for NH4+/NO3 removal

● Sulfammox, Feammox and Anammox occurred for NH4+ removal

Thiobacillus, Nitrospira , and Ca. Kuenenia were key functional microorganisms

An autotrophic denitrifying bioreactor with iron sulfide (FeS) as the electron donor was operated to remove ammonium (NH4+) and nitrate (NO3) synergistically from wastewater for more than 298 d. The concentration of FeS greatly affected the removal of NH4+/NO3. Additionally, a low hydraulic retention time worsened the removal efficiency of NH4+/NO3. When the hydraulic retention time was 12 h, the optimal removal was achieved with NH4+ and NO3 removal percentages both above 88%, and the corresponding nitrogen removal loading rates of NH4+ and NO3 were 49.1 and 44.0 mg/(L·d), respectively. The removal of NH4+ mainly occurred in the bottom section of the bioreactor through sulfate/ferric reducing anaerobic ammonium oxidation (Sulfammox/Feammox), nitrification, and anaerobic ammonium oxidation (Anammox) by functional microbes such as Nitrospira, Nitrosomonas, and Candidatus Kuenenia. Meanwhile, NO3 was mainly removed in the middle and upper sections of the bioreactor through autotrophic denitrification by Ferritrophicum, Thiobacillus, Rhodanobacter, and Pseudomonas, which possessed complete denitrification-related genes with high relative abundances.

Keywords Anammox      Denitrification      FeS      NH4+/NO3      Sulfammox     
Corresponding Author(s): Yuntao Guan   
Issue Date: 22 December 2022
 Cite this article:   
Yanfei Wang,Xiaona Zheng,Guangxue Wu, et al. Removal of ammonium and nitrate through Anammox and FeS-driven autotrophic denitrification[J]. Front. Environ. Sci. Eng., 2023, 17(6): 74.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-023-1674-4
https://academic.hep.com.cn/fese/EN/Y2023/V17/I6/74
Time(d) Influent concentration (mg/L) Influent loading rate (mg/(L·d))
Phase NH4+-N NO3-N NH4+-N NO3-N HRT (h)
1–20 I 100 100 50 50 24
21–51 II 100 100 50 50 24
52–147 III 100 100 50 50 24
148–170 IV 50 50 25 25 24
171–200 V 50 50 50 50 12
201–220 VI 50 50 100 100 6
221–240 VII 50 50 50 50 12
241–298 VIII 50 0 50 0 12
Tab.1  Operation parameters of the reactor
Fig.1  Dynamics of influent and effluent (a) NH4+-N, (b) NO3-N, and (c) NO2-N concentrations.
Fig.2  Dynamics of key parameters for different feed modes ((a–c), influent of NH4+ and NO3, (d–f), influent of only NH4+), including nitrogen concentrations of NH4+-N, NO2-N, and NO3-N (a, d), the nitrogen conversion pathways based on the mass balance along the flow path of the bioreactor (b, e), and the concentrations of S2–, SO42–, total-Fe, Fe2 +(c, f) in this reactor.
Fig.3  Microbial activities of functional microorganisms for Sulfammox (Sulfam), Feammox (Feam), nitrification (Nitrifi), Anammox (Anam), denitrification (Denitri) processes in the reactor (suspended sludge system (a–b), the entire system of biofilm and suspended sludge (c–d), N-loss: total inorganic nitrogen loss).
Fig.4  Variations of the measured effluent SO42– (a), and total-Fe concentrations (b) during the long-term operation.
Fig.5  The relative abundances of microbial community at the genus level (top 35) sampled from inoculum (Day 0) and Days 66, 156, 208, 235, 275 at different heights.
Fig.6  Relative abundances of nitrogen metabolism (a) and sulfur metabolism (b) related enzymes harbored by functional microorganisms in the reactor.
Fig.7  The proposed synergistic pathways of NH4+/ NO3 removal in this system (FeRB and SRB are referred to iron-reducing bacteria and sulfate-reducing bacteria, respectively).
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