Performance, kinetics characteristics and enhancement mechanisms in anammox process under Fe(II) enhanced conditions

Tang, Simin; Xu, Zehao; Liu, Yalei; Yang, Guangfeng; Mu, Jun; Jin, Ren‐Cun; Qiao, Yingjie

doi:10.1007/s10532-020-09905-y

Cited by 34 publications

(8 citation statements)

References 44 publications

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“…As the diameter of the sludge increases, the adsorption capacity of EPS for iron ions increased, and more iron ions are transported to anammox cells. With the excessive accumulation of iron ions, an inhibitory effect occurred …”

Section: Resultsmentioning

confidence: 99%

Advancing the Comprehension of Iron Ions with Different Valences in Anammox-Based Processes: Insight into the Response and Mechanism Based on Prediction and Classification Machine Learning Models

Jiang,

Xu,

et al. 2023

ACS EST Water

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The responses of anammox to Fe 2+ and Fe 3+ have been widely discussed; however, the critical concentration of Fe 2+ and Fe 3+ is not certain due to the different culture environments. A reliable and widely applicable predictive classification system based on the anammox-based system with iron-containing wastewater needs to be established, which can surmount the independence between different experiments and be combined with statistical analysis to elucidate the mechanism of the effect of Fe 2+ and Fe 3+ based on critical concentrations. The results confirmed that 5 mg/ L iron promoted the nitrogen removal process, while higher concentrations inhibited nitrogen removal with a ratio of above 80%. Moreover, the results of Spearman correlation analysis proved that Fe 2+ showed a more obvious effect on the nitrogen removal rate than Fe 3+ . To precisely predict the nitrogen removal performance of anammox, Support Vector Machine, XGBoost, and Random Forest (RF) were compared, and the RF model was confirmed as the preferable model (R 2 = 0.99). According to the classification model, the influence of iron ions on the anammox performance could be successfully traced back to the valent states of iron with an accuracy of 97.7%. Furthermore, a mechanism of the nitrogen removal process in the anammox-based system under iron ion stress was proposed.

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Section: Resultsmentioning

confidence: 99%

Advancing the Comprehension of Iron Ions with Different Valences in Anammox-Based Processes: Insight into the Response and Mechanism Based on Prediction and Classification Machine Learning Models

Jiang,

Xu,

et al. 2023

ACS EST Water

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“…Iron seems to be the most important cation, and a stimulating effect on granulation, biofilm growth, anammox activity, and total nitrogen removal by the bioreactor community was noted for both Fe 2+ and Fe 3+ [ 65 , 74 , 87 ]. In long-term experiments, the addition of iron cations increased the anammox activity by up to 20% compared to the control [ 88 ]. Fe 2+ is needed for redox reactions and electron transfer reactions in metabolic processes [ 89 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Mineral Carriers on Biofilm Formation and Nitrogen Removal Activity by an Indigenous Anammox Community from Cold Groundwater Ecosystem Alone and Bioaugmented with Biomass from a “Warm” Anammox Reactor

Vishnyakova

Popova

Artemiev

et al. 2022

Biology

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The complex pollution of aquifers by reduced and oxidized nitrogen compounds is currently considered one of the urgent environmental problems that require non-standard solutions. This work was a laboratory-scale trial to show the feasibility of using various mineral carriers to create a permeable in situ barrier in cold (10 °C) aquifers with extremely high nitrogen pollution and inhabited by the Candidatus Scalindua-dominated indigenous anammox community. It has been established that for the removal of ammonium and nitrite in situ due to the predominant contribution of the anammox process, quartz, kaolin clays of the Kantatsky and Kamalinsky deposits, bentonite clay of the Berezovsky deposit, and zeolite of the Kholinsky deposit can be used as components of the permeable barrier. Biofouling of natural loams from a contaminated aquifer can also occur under favorable conditions. It has been suggested that the anammox activity is determined by a number of factors, including the presence of the essential trace elements in the carrier and the surface morphology. However, one of the most important factors is competition with other microbial groups that can develop on the surface of the carrier at a faster rate. For this reason, carriers with a high specific surface area and containing the necessary microelements were overgrown with the most rapidly growing microorganisms. Bioaugmentation with a “warm” anammox community from a laboratory reactor dominated by Ca. Kuenenia improved nitrogen removal rates and biofilm formation on most of the mineral carriers, including bentonite clay of the Dinozavrovoye deposit, as well as loamy rock and zeolite-containing tripoli, in addition to carriers that perform best with the indigenous anammox community. The feasibility of coupled partial denitrification–anammox and the adaptation of a “warm” anammox community to low temperatures and hazardous components contained in polluted groundwater prior to bioaugmentation should be the scope of future research to enhance the anammox process in cold, nitrate-rich aquifers.

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“…As the most abundant transition metal in biological systems, iron was often found in nitrogenous wastewater and affected the biological activity (Ribeiro et al, 2017;Guo et al, 2019). It has been reported that the growth and activity of microorganisms were enhanced at lower iron level but inhibited at higher level in biosystems for nitrogen removal (Zhang., 2018;Zhang et al, 2019;Tang et al, 2020). Many studies have showed that a certain concentration of Fe(II) enhance microbial activity, thereby improving the nitrogen removal rate in nitrogen removal systems including anammox systems, nitrification, denitrification, completely autotrophic nitrogen removal over nitrite (CANON), etc.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have showed that a certain concentration of Fe(II) enhance microbial activity, thereby improving the nitrogen removal rate in nitrogen removal systems including anammox systems, nitrification, denitrification, completely autotrophic nitrogen removal over nitrite (CANON), etc. (Straub et al, 1996;Liu and Horn, 2012;Shu et al, 2016;Zhang et al, 2019;Tang et al, 2020). However, the response of nitrogen removal performance, kinetic characteristics and functional bacteria in SND system under Fe(II) enhanced conditions nearly has not been widely studied.…”

Section: Introductionmentioning

confidence: 99%

Performance, kinetic characteristics and bacterial community of short-cut nitrification and denitrification system at different ferrous ion conditions

Chang,

Zhang,

Chen

et al. 2024

Biodegradation

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In order to explore the operation performance, kinetic characteristics and bacterial community of the short-cut nitrification and denitrification (SND) system, the SND system with pre-cultured short cut nitrification and denitrification sludge was established and operated under different ferrous ion (Fe (II)) conditions.Experimental results showed that the NH4 + -N removal efficiency (ARE) of SND system was 97.3% on Day 5 and maintained a high level of 94.9%±1.3% for a long operation period. When the influent Fe(II) concentration increased from 2.3mg L -1 to 7.3mg L -1 , the sedimentation performance, sludge concentration and organic matter removal performance were improved. However, higher Fe(II) of 12.3mg L -1 decreased the removal performance of nitrogen and CODCr with the relative abundance of Proteobacteria and Bacteroidetes decreased to 30.28% and 19.41% , respectively. Proteobacteria, Bacteroidetes, Firmicutes were the dominant phyla in SND system.Higher Fe(II) level of 12.3 mg L -1 increase the RA of denitrifying genus Trichococcus (33.93%), and the denitrifying genus Thauera and Tolumonas dominant at Fe(II) level of no more than 7.3 mg L -1 .

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Performance, kinetics characteristics and enhancement mechanisms in anammox process under Fe(II) enhanced conditions

Cited by 34 publications

References 44 publications

Advancing the Comprehension of Iron Ions with Different Valences in Anammox-Based Processes: Insight into the Response and Mechanism Based on Prediction and Classification Machine Learning Models

Advancing the Comprehension of Iron Ions with Different Valences in Anammox-Based Processes: Insight into the Response and Mechanism Based on Prediction and Classification Machine Learning Models

Effect of Mineral Carriers on Biofilm Formation and Nitrogen Removal Activity by an Indigenous Anammox Community from Cold Groundwater Ecosystem Alone and Bioaugmented with Biomass from a “Warm” Anammox Reactor

Performance, kinetic characteristics and bacterial community of short-cut nitrification and denitrification system at different ferrous ion conditions

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