Formation of microorganism-derived dissolved organic nitrogen in intermittent aeration constructed wetland and its stimulating effect on phytoplankton production: Implications for nitrogen mitigation

Wang, Xiaoning; Wang, Jie; Chen, Jingyi; Chen, Jieyu; Lv, Yabing; Chen, Ruiya; Xu, Juchen; Li, Dapeng; He, Xinyi; Hou, Jie

doi:10.1016/j.watres.2022.119563

Cited by 11 publications

(3 citation statements)

References 43 publications

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“…This result indicated that DON instead of DIN played a dominant role in N-based biomass production. Wang et al found a similar relationship between DON and N-based biomass production and demonstrated that produced DON showed a greater stimulating effect on biomass productivity than DIN in wastewater effluent from constructed wetlands. Similarly, numerical analysis also showed that the low-molecular-weight DON component from the biological wastewater treatment process produced nearly 10 times more Chl a than DIN per mg N basis .…”

Section: Resultsmentioning

confidence: 82%

“…To assess the eutrophication potential of effluent from the bioreactors, we conducted a bioassay according to previous studies. , Briefly, the algal species used in this study was Selenastrum capricornutum, which was obtained from the FACHB collection of the Chinese Academy of Sciences. To remove large particles but retain the bacteria as a bacterial inoculum of the bioassay, a glass fiber filter (0.7 μm pore size) was used.…”

Section: Methodsmentioning

confidence: 99%

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2-Hydroxy-1,4-Naphthoquinone: A Promising Redox Mediator for Minimizing Dissolved Organic Nitrogen and Eutrophication Effects of Wastewater Effluent

Cheng,

You,

et al. 2024

Environ. Sci. Technol.

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Researchers and engineers are committed to finding effective approaches to reduce dissolved organic nitrogen (DON) to meet more stringent effluent total nitrogen limits and minimize effluent eutrophication potential. Here, we provided a promising approach by adding specific doses of 2-hydroxy-1,4-naphthoquinone (HNQ) to postdenitrification bioreactors. This approach of adding a small dosage of 0.03−0.1 mM HNQ effectively reduced the concentrations of DON in the effluent (ANOVA, p < 0.05) by up to 63% reduction of effluent DON with a dosing of 0.1 mM HNQ when compared to the control bioreactors. Notably, an algal bioassay indicated that DON played a dominant role in stimulating phytoplankton growth, thus effluent eutrophication potential in bioreactors using 0.1 mM HNQ dramatically decreased compared to that in control bioreactors. The microbe-DON correlation analysis showed that HNQ dosing modified the microbial community composition to both weaken the production and promote the uptake of labile DON, thus minimizing the effluent DON concentration. The toxic assessment demonstrated the ecological safety of the effluent from the bioreactors using the strategy of HNQ addition. Overall, HNQ is a promising redox mediator to reduce the effluent DON concentration with the purpose of meeting low effluent total nitrogen levels and remarkably minimizing effluent eutrophication effects.

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Section: Resultsmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

2-Hydroxy-1,4-Naphthoquinone: A Promising Redox Mediator for Minimizing Dissolved Organic Nitrogen and Eutrophication Effects of Wastewater Effluent

Cheng,

You,

et al. 2024

Environ. Sci. Technol.

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“…However, the accumulation of NO 2 − -N caused by continuous aeration resulted in a decrease in the TN removal rate. Studies have shown that intermittent aeration stimulates microorganisms to release tryptophan and simple aromatic proteins, while this situation does not occur under continuous aeration conditions [7,18]. Bian et al [19] showed that when the initial DO concentration increased from 0.5 mg/L to 1.5 mg/L, the TN removal rate increased by 20% accordingly.…”

Section: Effects Of Different Aeration Modes On Denitrification Perfo...mentioning

confidence: 99%

Study on Enhancement of Denitrification Performance of Alcaligenes faecalis

Luo,

Hu,

Zhang

et al. 2023

Separations

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Nitrogen pollution in water bodies presents a serious threat to ecosystems due to its role in eutrophication. In this study, the aerobic denitrifying bacterium Alcaligenes faecalis was used as a model microorganism to investigate the optimal operating conditions for nitrogen removal from nitrogen-containing wastewater by Alcaligenes faecalis under different aeration modes, microbial dosages and C/N ratios. The results showed that the optimal aeration mode for efficient bacterial denitrification was 10 min of aeration with a 30 min interval, and the total nitrogen removal reached 87.82%. At different bacterial doses, NO3−–N was completely denitrified and NO2−–N accumulation levels were reduced, all of which resulted in significant denitrification, and the final total nitrogen removal efficiencies reached 86.39–98.50%. With an increase in the C/N ratio, the pollutant removal performance of denitrifying bacteria increased. When the C/N ratio was 17, the final rates of NO3−–N, TN and COD removal were 100%, 98.50% and 96.13%, respectively. At lower C/N ratios, the growth and metabolism of microorganisms were inhibited and fewer electron acceptors were available during the denitrification process, which seriously affected denitrification performance. In this study, the denitrification performance of aerobic denitrifying bacterium Alcaligenes faecalis was explored in experiments using changes in aeration mode, microbial dosage and C/N ratio, and the optimal operating conditions of Alcaligenes faecalis for treating nitrogenous wastewater were indicated. This provides technical support for Alcaligenes faecalis in improving the remediation effect of nitrogenous wastewater and provides a theoretical basis for further in-depth research on the performance of Alcaligenes faecalis in the future.

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Impact of aerobic/anoxic alternation number on performance, microbial community and functional genes of sequencing batch biofilm reactor treating mariculture wastewater

Wang

Pan

Chu

et al. 2023

Bioresource Technology

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Formation of microorganism-derived dissolved organic nitrogen in intermittent aeration constructed wetland and its stimulating effect on phytoplankton production: Implications for nitrogen mitigation

Cited by 11 publications

References 43 publications

2-Hydroxy-1,4-Naphthoquinone: A Promising Redox Mediator for Minimizing Dissolved Organic Nitrogen and Eutrophication Effects of Wastewater Effluent

2-Hydroxy-1,4-Naphthoquinone: A Promising Redox Mediator for Minimizing Dissolved Organic Nitrogen and Eutrophication Effects of Wastewater Effluent

Study on Enhancement of Denitrification Performance of Alcaligenes faecalis

Impact of aerobic/anoxic alternation number on performance, microbial community and functional genes of sequencing batch biofilm reactor treating mariculture wastewater

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