Insights into N2O turnovers under polyethylene terephthalate microplastics stress in mainstream biological nitrogen removal process

He, Yonghong; Liu, Yingrui; Yan, Min; Zhao, Tianhang; Liu, Yiwen; Zhu, Tingting; Ni, Bing‐Jie

doi:10.1016/j.watres.2022.119037

Cited by 37 publications

(10 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, it was reasonable to infer that the dead cells and EPS components wrapped around PVC-MPs would provide more anoxic microenvironment, which was favorable for the growth of involved denitrifiers and hence N 2 O production via heterotrophic denitrification (Figures and ). , AOB denitrification was generally promoted under the oxygen-limited condition . However, our results suggested that the contribution of the AOB denitrification pathway decreased in experimental reactors (Figure F), which had more anoxic microzones due to the interaction between PVC-MPs and PN sludge.…”

Section: Resultsmentioning

confidence: 70%

“…In addition, PVC-MPs increased the abundances of some denitrifying genera, possibly due to the interaction with PN sludge, i.e., increasing the possibility of providing more anoxic microzones and available substrates so that heterotrophic denitrification was promoted (Figure ). For instance, the predominant Arenimonas, enabling the degradation of refractory organics, sharply increased from 5.45 ± 0.52 to 41.82 ± 4.61% after long-term PVC-MP exposure. Similarly, the relative abundance increased from 0.11 ± 0.01 to 6.70 ± 0.97% for Ferruginibacter, known as a type of HB hydrolyzing organic matter .…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, it was reasonable to infer that the dead cells and EPS components wrapped around PVC-MPs would provide more anoxic microenvironment, 45 which was favorable for the growth of involved denitrifiers and hence N 2 O production via heterotrophic denitrification (Figures 2 and 4). 22,46 AOB denitrification was generally promoted under the oxygen-limited condition.…”

Section: Understanding the Interaction Between Pvc-mps And Pn Sludgementioning

confidence: 99%

See 2 more Smart Citations

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

He,

Liu,

et al. 2024

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Partial nitritation (PN) is an important partner with anammox in the sidestream line treating high-strength wastewater and primarily contributes to nitrous oxide (N 2 O) emissions in such a hybrid system, which also suffers from ubiquitous microplastics because of the growing usage and disposal levels of plastics. In this study, the influences of polyvinyl chloride microplastics (PVC-MPs) on N 2 O-contributing pathways were experimentally revealed to fill the knowledge gap on N 2 O emission from the PN system under microplastics stress. The long-term results showed that the overall PN performance was hardly affected by the low-dose PVC-MPs (0.5 mg/L) while obviously deteriorated by the high dose (5 mg/L). According to the batch tests, PVC-MPs reduced biomassspecific ammonia oxidation rates (AORs) by 5.78−21.94% and stimulated aerobic N 2 O production by 9.22−88.36%. Further, upon increasing dissolved oxygen concentrations from 0.3 to 0.9 mg O 2 /L, the degree of AOR inhibition increased but that of N 2 O stimulation was lightened. Site preference analysis in combination with metabolic inhibitors demonstrated that the contributions of hydroxylamine oxidation and heterotrophic denitrification to N 2 O production at 0.3 mg O 2 /L were enhanced by 18.84 and 10.34%, respectively, accompanied by a corresponding decreased contribution of nitrifier denitrification. Finally, the underlying mechanisms proposed for negative influences of PVC-MPs were bisphenol A leaching and reactive oxygen species production, which led to more cell death, altered sludge properties, and reshaped microbial communities, further resulting in enhanced N 2 O emission. Overall, this work implied that the ubiquitous microplastics are a hidden danger that cannot be ignored in the PN system.

show abstract

Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Understanding the Interaction Between Pvc-mps And Pn Sludgementioning

confidence: 99%

See 1 more Smart Citation

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

He,

Liu,

et al. 2024

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The construction of Beijing's Anammox denitrification project, which boasts the world's largest sludge digestion capacity at 15900 m 3 day −1 , anticipates an annual reduction in carbon emissions estimated at 10500 ton CO 2 -eq per year [ 43 ]. Nevertheless, due to the nitrite demand and oxygen-limited conditions, Anammox is usually applied for BNR in the presence of nitrifiers and heterotrophic denitrifiers, which would produce N 2 O during the BNR process [ 51 , 52 ]. The partial nitritation/anammox system did have a higher N 2 O emission factor than CAS in some studies [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

Mitigating greenhouse gas emissions from municipal wastewater treatment in China

Tong,

Liao,

et al. 2024

Environmental Science and Ecotechnology

Self Cite

View full text Add to dashboard Cite

“…The biofilm is stratified as three layers in the model (Carlson et al, 2021; He & Daigger, 2023), with biofilm activities in each layer simulated as a continuous stirred tank reactor and each layer connected by simulating diffusion. Three layers are selected for simplicity after running some preliminary models with different layers (data not shown).…”

Section: Methodsmentioning

confidence: 99%

Monitoring biofilm thickness using the membrane aerated biofilm reactor (MABR) fingerprint soft sensor to optimize nitrogen removal

Cao,

Cui,

Daigger

2023

Water Environment Research

View full text Add to dashboard Cite

The ongoing commercialization and installation of full‐scale membrane aerated biofilm reactors (MABRs) stimulate the increasing need to monitor biofilm development. Biofilm thickness in MABRs can be assessed indirectly by plotting the exhaust oxygen purity versus bulk ammonia concentration, defined here as the MABR fingerprint soft sensor. Dynamic simulations with diurnal flow variations of an MABR unit model were implemented over a broad range of biofilm thicknesses and influent conditions consisting of variable C/N ratios and applied ammonia fluxes to assess the utility of the MABR fingerprint. Results show that the continuously decreasing trend of the MABR fingerprint plot slopes can be employed as a useful signal for biofilm thickness control in nitrogen removal processes. This technique is useful in a wide range of influent conditions and is helpful for MABR operators and designers to arrange biofilm thickness control events efficiently and determine where in an overall treatment process the technique can be applied to control biofilm thickness and optimize process performance.Practitioner points The linear relationship between exhaust oxygen purity and bulk ammonia concentration is defined as the MABR fingerprint plot. MABR fingerprint plots are generated for a given biofilm thickness with diurnal flow or short‐term loading variations implemented. Continuously decreasing trends of the MABR fingerprint plot slopes are useful signals for biofilm control in nitrogen removal. The MABR fingerprint is useful over a wide range of influent conditions regarding C/N ratios and applied ammonia fluxes. MABR practitioners can use the fingerprint plots to determine when biofilm control measures should be taken.

show abstract

Insights into N2O turnovers under polyethylene terephthalate microplastics stress in mainstream biological nitrogen removal process

Cited by 37 publications

References 54 publications

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

Mitigating greenhouse gas emissions from municipal wastewater treatment in China

Monitoring biofilm thickness using the membrane aerated biofilm reactor (MABR) fingerprint soft sensor to optimize nitrogen removal

Contact Info

Product

Resources

About