The potent effects of polyoxometalates (POMs) on controlling sulfide and methane production from sewers

Guo, Haixiao; Tian, Lixin; Liu, Siru; Wang, Yufen; Hou, Jiaqi; Zhu, Tingting; Liu, Yiwen

doi:10.1016/j.cej.2022.139955

Cited by 27 publications

(5 citation statements)

References 57 publications

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“…Iron content on the surface of PAA-induced WAS is lower than that of the control ( Fig. 6 d), attributing to the fact that PAA-induced AOP causes Fe 2+ release from EPS and its redistribution in sludge flocs through disrupting sludge structure [ 53 ]. Thus, Fe 2+ is likely to be the vital substance for PAA activation by WAS.…”

Section: Resultsmentioning

confidence: 99%

Peracetic acid (PAA)-based pretreatment effectively improves medium-chain fatty acids (MCFAs) production from sewage sludge

Wang,

Guo,

et al. 2024

Environmental Science and Ecotechnology

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Section: Resultsmentioning

confidence: 99%

Peracetic acid (PAA)-based pretreatment effectively improves medium-chain fatty acids (MCFAs) production from sewage sludge

Wang,

Guo,

et al. 2024

Environmental Science and Ecotechnology

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“…There might be some organic degradation intermediates of BMPs, providing a reasonable explanation for the significantly higher relative content of the fluorescent component [excitation and emission wavelengths of 251 nm (331 nm) and 415 nm, respectively] in the effluent (Figure S17). ,, Considering the increased EPS concentrations but lower intensities of characteristic peaks of the Fourier transform infrared (FTIR) spectrum in the reactor with BMPs (Figure C and Figure S18), the degradation intermediates of BMPs were thought to bind to active sites of EPS or be adsorbed by denitrifying sludge. , Accordingly, a dramatically lower content of C1 (excitation and emission wavelengths of 283 and 344 nm, respectively, representing tryptophan-like proteins) , but a much higher content of C3 (excitation and emission wavelengths of 274 and 311 nm, respectively, representing tyrosine-like proteins) were observed in the reactor with BMPs (Figure E). In contrast, there was no significant difference between the control reactor and that with NBMPs [ p > 0.05 (Table S4)].…”

Section: Results and Discussionmentioning

confidence: 99%

Biodegradable Microplastics Increase N₂O Emission from Denitrifying Sludge More Than Conventional Microplastics

He,

Li,

Liu

et al. 2024

Environ. Sci. Technol. Lett.

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Despite the increasing concern about the impacts of microplastics on wastewater treatment, the underlying mechanism by which microplastics affect nitrous oxide (N 2 O) accumulation during denitrification is still underexplored. In particular, effects of biodegradable microplastics (BMPs) on sewage sludge systems are largely overlooked. Previous studies often used one type of polymer as model microplastics, far from a real-world scenario of various microplastics occurring simultaneously. This work assesses the toxic influences of microplastics by chronically adding four typical BMPs versus four conventional nonbiodegradable microplastics (NBMPs) to denitrifying sludge. Our results showed that both BMPs and NBMPs suppressed denitrification performance, intensified electron competition, regulated electron distribution, and consequently promoted N 2 O accumulation at a chemical oxygen demand:nitrate ratio of <4:1. Importantly, more severe impacts were observed in the reactor with BMPs. A subsequent mechanistic study revealed that BMPs significantly decreased the relative abundances of denitrifiers and key genes involved in the electron transport and consumption system (ETCS), which might be related to the significantly varied extracellular polymeric substance components. In contrast, NBMPs damaged bacterial membranes and directly caused more dead cells by overproducing reactive oxygen species, hence disrupting the ETCS. Overall, this work suggested that microplastics in wastewater, especially BMPs, could disrupt denitrification and potentially increase greenhouse gas emission.

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“…However, high-dose PVC-MPs resulted in decreased EPS secretion due to its biocidal effect, leading to more cell death, as detected by the LIVE/DEAD Bacterial Staining Kit (Figure S9). 43,44 In addition, a 21.3 ± 2.6% increase in LDH release was detected (Figure 3D), indicating that PVC-MPs destroyed cell membrane integrity, 44 which was an important factor for the increased fractions of dead cells in experimental reactors. As a result, the overall performance and AORs were negatively affected in the 5 mg/L PVC-MP reactor.…”

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

confidence: 92%

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

He,

Liu,

et al. 2024

Environ. Sci. Technol.

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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.

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The potent effects of polyoxometalates (POMs) on controlling sulfide and methane production from sewers

Cited by 27 publications

References 57 publications

Peracetic acid (PAA)-based pretreatment effectively improves medium-chain fatty acids (MCFAs) production from sewage sludge

Peracetic acid (PAA)-based pretreatment effectively improves medium-chain fatty acids (MCFAs) production from sewage sludge

Biodegradable Microplastics Increase N₂O Emission from Denitrifying Sludge More Than Conventional Microplastics

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

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The potent effects of polyoxometalates (POMs) on controlling sulfide and methane production from sewers

Cited by 27 publications

References 57 publications

Peracetic acid (PAA)-based pretreatment effectively improves medium-chain fatty acids (MCFAs) production from sewage sludge

Peracetic acid (PAA)-based pretreatment effectively improves medium-chain fatty acids (MCFAs) production from sewage sludge

Biodegradable Microplastics Increase N2O Emission from Denitrifying Sludge More Than Conventional Microplastics

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

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Biodegradable Microplastics Increase N₂O Emission from Denitrifying Sludge More Than Conventional Microplastics