Microplastics affect the ammonia oxidation performance of aerobic granular sludge and enrich the intracellular and extracellular antibiotic resistance genes

Wang, Zhiqi; Gao, Jingfeng; Dai, Huihui; Zhao, Yifan; Li, Dingchang; Duan, Wanjun; Guo, Yi

doi:10.1016/j.jhazmat.2020.124981

Cited by 53 publications

(15 citation statements)

References 41 publications

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“…Previous studies suggested that MPs/NPs can interfere or alter EPS structures . In this study, EPS polysaccharides and proteins were characterized as the major constituents of sludge EPS .…”

Section: Resultsmentioning

confidence: 68%

“…Compared to the control, there was a marginal decrease in ROS level (−4.9%) for 50 μg/L of PsNPs, whereas higher PsNPs levels increased ROS levels by 17.1 (100 μg/L PsNPs) and 34.84% (150 μg/L PsNPs). A few recent studies also reported that high MPs/NPs levels would increase the ROS generation in AD. , Interestingly, THP could reduce ROS levels for sludge exposed to high PsNPs levels (100–150 μg/L). For instance, ROS levels in 80 ° C-100 μg/L and 160 ° C-100 μg/L decreased by 7.8 and 3.5% compared to 100 μg/L of PsNPs alone.…”

Section: Resultsmentioning

confidence: 99%

“…A few recent studies also reported that high MPs/NPs levels would increase the ROS generation in AD. 37,38 Interestingly, THP could reduce ROS levels for sludge exposed to high PsNPs levels (100−150 μg/L). For instance, ROS levels in 80 °C-100 μg/L and 160 °C-100 μg/L decreased by 7.8 and 3.5% compared to 100 μg/L of PsNPs alone.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Thermal Hydrolysis of Sludge Counteracts Polystyrene Nanoplastics-Induced Stress during Anaerobic Digestion

et al. 2022

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Microplastics (MPs)/nanoplastics (NPs) have been widely detected in wastewater treatment plants (WWTPs). They are captured mainly by sludge and unavoidably move into the anaerobic digestion (AD) process. Recent studies suggested that MPs/NPs could induce oxidative stress to the microbiome in digesters. The thermal hydrolysis process (THP) has been implemented for sludge pretreatment in many full-scale WWTPs. To date, there is limited knowledge about how THP can influence MPs/NPs-induced stress during AD. This study systematically investigated the impact of THP (80 and 160 °C) on AD of sewage sludge exposed to different levels (50–150 μg/L) of polystyrene nanoplastics (PsNPs), one of the most found MPs/NPs in WWTPs. Compared to the control, higher PsNPs levels of 100 and 150 μg/L decreased methane yields by 17.98 and 29.34%, respectively. Moreover, reactive oxygen species (ROS) levels increased by 17.18 and 34.84%. Our results demonstrated that THP counteracted the suppression of methane production imposed by such PsNPs concentrations, with decreased ROS levels. Also, THP reduced antibiotic resistance gene (ARG) propagation that can be encouraged by PsNPs, thus minimizing the ARG transmission risks of digestate biosolids. These findings suggest that THP holds a high promise to further develop as a remediation method for MPs/NPs in WWTPs.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Thermal Hydrolysis of Sludge Counteracts Polystyrene Nanoplastics-Induced Stress during Anaerobic Digestion

et al. 2022

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“…Even though a precise, accurate and united definition of MPs and NPs has not yet been established in the literature, as scientists are still disputing [11], the majority of the authors have defined MPs as the particles of synthetic polymers with sizes <5 mm or <1000 µm to >0.1 µm or 1 µm to 1 mm [12], while NPs are the pieces of plastics with a size <20 µm or <0.1 µm or <1 µm or <100 nm or <1000 nm [13]. Those materials can be further divided into primary and secondary MPs and NPs.…”

Section: Microplastics Nanoplastics and Plastic-derived Chemicalsmentioning

confidence: 99%

Potential Effects of Persistent Organic Contaminants on Marine Biota: A Review on Recent Research

Vagi

Petsas

Kostopoulou

2021

Water

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Synthetic organic compounds belonging to different chemical classes and possessing diverse physicochemical properties are frequently present in marine environments. Microplastics, pharmaceuticals, pesticides, polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs) are contained in the list of persistent organic pollutants (POPs) that have been detected in the global marine system. Numerous ecotoxicological studies have revealed the direct and indirect effects of anthropogenic toxicants on marine biota. The present review presents the research that has been conducted during the period from 1 January 2016 to 30 June2021 concerning the lethal and sub-lethal impacts of selected organic-synthetic stressors on different plant and animal marine species, and summarizes the observed or predicted individual and combined effects after exposure to chemical mixtures of such contaminants. Future research needs dependent on the knowledge gaps that remain in the bibliography are also highlighted.

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“…Although the full spectrum of their effects and mechanisms is yet to be determined, microplastic bioaccumulation in multiple biota through higher trophic levels has the potential to amplify their effects by their increasing dosage in top predators (such as humans) and can affect functions as varied as feeding behaviors, metabolism, and fecundity (da Costa Araujo and Malafaia 2021 ; Foley et al 2018 ). Sampling different environments and geographic locations has shown microplastic burdens of varying abundance, types, sizes, shapes, and ages, contributing to a variety of health dangers including bacterial antibiotic resistance (Su et al 2021 ; Wang et al 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Polystyrene and Polyethylene Microplastics Decrease Cell Viability and Dysregulate Inflammatory and Oxidative Stress Markers of MDCK and L929 Cells In Vitro

2021

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Microplastics are ubiquitous environmental pollutants that are a growing concern to many ecosystems, as well as human health. Many of the effects of microplastics on mammalian cells and tissues remain unknown. To address this, we treated L929 murine fibroblasts and Madin–Darby canine kidney (MDCK) epithelial cell lines with 1 μg/mL, 10 μg/mL, or 20 μg/mL of polyethylene (PE) or polystyrene (PS) microspheres in vitro for 6 and 24 h and measured the resulting changes in cell viability, metabolism, and transcriptional expression of inflammatory cytokines and antioxidant enzymes. We observed dose-dependent decreases in cell viability corresponding to increases in doses of both PE and PS. We conducted cell metabolism assays and observed dose-dependent increases in metabolism per cell with increasing doses of both PE and PS. Similarly, we also observed increased expression of the superoxide dismutase-3 gene ( SOD3 ), indicating oxidative stress caused by the microplastics treatments. We also observed increased expression of TNFα , but decreased expression of IFNβ , suggesting different mechanisms by which the microplastics regulate inflammatory responses in mammalian cells. Our results contribute new data to the growing understanding of the effects of microplastics on mammalian cells and indicate complex cellular stress responses to microplastics in the environment.

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Microplastics affect the ammonia oxidation performance of aerobic granular sludge and enrich the intracellular and extracellular antibiotic resistance genes

Cited by 53 publications

References 41 publications

Thermal Hydrolysis of Sludge Counteracts Polystyrene Nanoplastics-Induced Stress during Anaerobic Digestion

Thermal Hydrolysis of Sludge Counteracts Polystyrene Nanoplastics-Induced Stress during Anaerobic Digestion

Potential Effects of Persistent Organic Contaminants on Marine Biota: A Review on Recent Research

Polystyrene and Polyethylene Microplastics Decrease Cell Viability and Dysregulate Inflammatory and Oxidative Stress Markers of MDCK and L929 Cells In Vitro

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