Polystyrene nanoplastics reshape the anaerobic granular sludge for recovering methane from wastewater

Wei, Wei; Hao, Qiang; Chen, Zhijie; Bao, Teng; Ni, Bing‐Jie

doi:10.1016/j.watres.2020.116041

Cited by 117 publications

(39 citation statements)

References 61 publications

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“…The GPB and GNB were identified, as described in the Supporting Information. Live and dead cells were observed according to the live/dead staining test in the Supporting Information . Cell viability was analyzed by the Cell Counting Kit-8 (CCK-8) according to the procedure in the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

“…Results showed that the concentrations of PE, PET, PS, and PP were ∼24, ∼25, ∼7, and ∼5 particles/g-TS, respectively. The regular properties of WAS-control and WAS-experimental after eliminating microplastic interference, as previously described, 29 were analyzed (Table S1). Besides, sludge particle size, polyhydroxyalkanoate content, and Gram-positive/negative bacteria (GPB/GNB) of WAS-control and WASexperimental were analyzed.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Live and dead cells were observed according to the live/dead staining test in the Supporting Information. 29 Cell viability was analyzed by the Cell Counting Kit-8 (CCK-8) according to the procedure in the Supporting Information. The measurement of the ROS level was conducted using the ROS Activity Assay Kit (Amyjet, China).…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Different Pathways of Microplastics Entering the Sludge Treatment System Distinctively Affect Anaerobic Sludge Fermentation Processes

Wei

Chen

2021

Environ. Sci. Technol.

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Microplastics in wastewater inevitably accumulate in waste activated sludge (WAS) via wastewater biological treatment, potentially affecting the subsequent sludge treatment unit. Nevertheless, all previous research studies focused on the impacts of the direct addition of one type of model microplastics on the sludge anaerobic treatment process. This approach actually cannot reflect the real situation where multiple different microplastics simultaneously get into the wastewater treatment unit prior to the sludge treatment unit. Herein, this work innovatively proposed a more realistic method to assess the real toxic influences of microplastics on anaerobic WAS fermentation for short-chain fatty acid (SCFA) production by initially adding four typical microplastics (i.e., polyethylene terephthalate, polystyrene, and polypropylene) to the biological wastewater treatment system. Results showed that four microplastics initially entering the biological wastewater treatment reactor had little influence on the subsequent anaerobic SCFA production since WAS solubilization increased but hydrolysis and acidification decreased. In contrast, when the four microplastics were directly dosed in a WAS anaerobic fermenter, although there was no effect on WAS solubilization, the bioprocess of hydrolysis–acidification was clearly suppressed, ultimately significantly (P = 1.86 × 10–7) inhibiting the maximal SCFA production from WAS by 21.5 ± 0.1% compared to the control without microplastic addition. The excessive oxidative stress and toxic leachates from these typical microplastics reduced the relative abundances of key anaerobes (e.g., Longilinea sp.) involved in the anaerobic fermentation. This work revealed that the different pathways of microplastics entering the sludge treatment system had different impacts on anaerobic sludge fermentation processes and selecting a more realistic and accurate approach was important to evaluate the true toxicity of microplastics on the sludge anaerobic treatment system.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Different Pathways of Microplastics Entering the Sludge Treatment System Distinctively Affect Anaerobic Sludge Fermentation Processes

Wei

Chen

2021

Environ. Sci. Technol.

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“…Recently, several authors studied also the effects of MPs on methane and hydrogen production through anaerobic digestion of SeS, showing a strong dependence of the chemical nature of the plastic materials and their particle size and concentration. In general, low concentrations of MPs seem not to affect or slightly increase the methane production, while a highest number of MPs particles leads to the opposite effect [88,89]. For instance, Zhang et al [90] highlighted that methane production in anaerobic system was not affected by polystyrene MPs in the case of low concentration (0.2 g L −1 ), while it can be reduced almost by 20% in presence of the same MPs in higher dosage (0.25 g L −1 ).…”

Section: Effect On Sludge Propertiesmentioning

confidence: 99%

Microplastics in Sewage Sludge: A Known but Underrated Pathway in Wastewater Treatment Plants

et al. 2021

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Interest in the presence of microplastics (MPs) in wastewater has grown significantly in recent years. In fact, wastewater treatment plants (WWTPs) represent the last barrier before the discharge of MPs into an aquatic ecosystem. The research has highlighted how MPs are in part effectively removed from the waters and accumulated inside the sewage sludge (SeS) produced by the WWTP, being a cause for concern, especially in the case of agricultural reuse. This work aims to analyze the existing literature on the (i) methodical procedure for MPs analysis (thermal, spectroscopic, optical analyses), (ii) qualitative and quantitative presence of MPs in SeS, (iii) effect on sludge properties, and (iv) the possible accumulation in amended soils. Based on the results already obtained in the literature, this work aims to provide critical insights to stimulate interest in the topic and direct future research on aspects that should be deepened. In particular, it emerges that there is a clear need for standardization of the collection methods and the analytical techniques for identifying and quantifying MPs, since their physico-chemical characterization and the study on aging and on the response towards acid or basic pre-treatments are fundamental for the understanding of microplastics ecotoxicological potential.

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“…1 The size of the disposed plastics is reduced during fragmentation, aggregation, deposition, and transportation in water bodies. [2][3][4][5][6] As plastics are ubiquitous and long-lasting, they become accumulated rather than decomposed. 1,7,8 Based on the size of the plastics, they can be categorized as microplastics (more than 100 nm up to 500 mm) and nanoplastics (<100 nm).…”

Section: Introductionmentioning

confidence: 99%

Development of a schwarzite-based moving bed 3D printed water treatment system for nanoplastic remediation

et al. 2021

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Polystyrene nanoplastics reshape the anaerobic granular sludge for recovering methane from wastewater

Cited by 117 publications

References 61 publications

Different Pathways of Microplastics Entering the Sludge Treatment System Distinctively Affect Anaerobic Sludge Fermentation Processes

Different Pathways of Microplastics Entering the Sludge Treatment System Distinctively Affect Anaerobic Sludge Fermentation Processes

Microplastics in Sewage Sludge: A Known but Underrated Pathway in Wastewater Treatment Plants

Development of a schwarzite-based moving bed 3D printed water treatment system for nanoplastic remediation

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