Effect of ferric iron (Fe(Ш)) on heterotrophic solid-phase denitrification: Denitrification performance and metabolic pathway

Pang, Yunmeng; Wang, Jianlong

doi:10.1016/j.biortech.2022.128401

Cited by 20 publications

(1 citation statement)

References 40 publications

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“…In contrast, in a batch reactor with citrate as the carbon source, 17.7 mg/L Fe 3+ was found to suppress the overall denitrification process ( Ramírez et al, 2018 ). In addition, Pang and Wang (2023) have recently shown that at concentrations of 10 and 50 mg/L, Fe 3+ can markedly suppress the removal of NO 3 – -N and facilitate the accumulation of NO 2 – -N during solid-phase denitrification. In their survey of the effects of Fe 3+ on the performance of an A 2 O system, Zhang et al (2021) observed a concentration-dependent effect, with chemical oxygen demand (COD) and ammonia nitrogen (NH 4 + -N) removal efficiencies being enhanced at Fe 3+ concentrations lower than 10 mg/L, whereas these processes were effectively suppressed at Fe 3+ concentrations higher than 10 mg/L.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Zhong

Pang³

et al. 2023

Front. Microbiol.

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In this study, the influence of Fe3+ on N removal, microbial assembly, and species interactions in a biofilm system was determined. The results showed that maximum efficiencies of ammonia nitrogen (NH4+-N), total nitrogen (TN), phosphorus (P), and chemical oxygen demand (COD) removal were achieved using 10 mg/L Fe3+, reaching values of 100, 78.85, 100, and 95.8%, respectively, whereas at concentrations of 15 and 30 mg/L Fe3+ suppressed the removal of NH4+-N, TN, and COD. In terms of absolute abundance, the expression of bacterial amoA, narG, nirK, and napA was maximal in the presence of 10 mg/L Fe3+ (9.18 × 105, 8.58 × 108, 1.09 × 108, and 1.07 × 109 copies/g dry weight, respectively). Irrespective of Fe3+ concentrations, the P removal efficiency remained at almost 100%. Candidatus_Competibacter (10.26–23.32%) was identified as the most abundant bacterial genus within the system. Determinism (50%) and stochasticity (50%) contributed equally to microbial community assembly. Co-occurrence network analysis revealed that in the presence of Fe3+, 60.94% of OTUs in the biofilm system exhibited positive interactions, whereas 39.06% exhibited negative interactions. Within the OTU-based co-occurrence network, fourteen species were identified as key microbes. The stability of the system was found to be predominantly shaped by microbial cooperation, complemented by competition for resources or niche incompatibility. The results of this study suggested that during chemical P removal in wastewater treatment plants using biofilm methods, the concentration of supplemental Fe3+ should be maintained at 10 mg/L, which would not only contribute to P elimination, but also enhance N and COD removal.

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Section: Introductionmentioning

confidence: 99%

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Zhong

Pang³

et al. 2023

Front. Microbiol.

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Photosynthesis Characterization of Mutant Algae and Enhanced Carbon Fixation of Algae–Bacteria Symbiosis Treating Municipal Wastewater

Zhao,

Liu,

Wang

et al. 2024

Fuel Cells

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Algae–bacteria symbiosis (ABS) as a sustainable wastewater treatment process has drawn mounting attention. However, nontrivial CO2 emissions were still present in municipal wastewater treatment due to the inadequate carbon fixation efficiency of microalgae under low carbon level. The obtained UV‐induced mutant Chlorella vulgaris MIHL4 performed higher carbon fixation capability (14.5%) and biomass productivity (25.3%) with improved photosynthetic fluorescence parameters and enzyme activities compared to wild‐type C. vulgaris. Transcriptome analyses showed pathways related to the carbon fixation and carbon catabolism were significantly up‐regulated in MIHL4. Compared with ABS inoculated with wild‐type C. vulgaris, CO2 emissions were significantly reduced by 32.1%–38.3% in ABS inoculated with MIHL4, where the biomass growth, metabolic activity, and sludge granulation were enhanced. Chlorella responsible for carbon fixation was the dominant population (19.3%) in ABS inoculated with MIHL4, in which the abundance of functional microbes and genes associated with photosynthesis as well as nutrient removal increased.

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Electroactive microorganism-assisted remediation of groundwater contamination: Advances and challenges

Feng

Yang

Zhang

et al. 2023

Bioresource Technology

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Effect of ferric iron (Fe(Ш)) on heterotrophic solid-phase denitrification: Denitrification performance and metabolic pathway

Cited by 20 publications

References 40 publications

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Photosynthesis Characterization of Mutant Algae and Enhanced Carbon Fixation of Algae–Bacteria Symbiosis Treating Municipal Wastewater

Electroactive microorganism-assisted remediation of groundwater contamination: Advances and challenges

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