Abundance and removal characteristics of microplastics at a wastewater treatment plant in Zhengzhou

Ren, Pengju; Dou, Ming; Cai, Wei; Li, GuiQiu; Jia, Ruipeng

doi:10.1007/s11356-020-09611-5

Cited by 54 publications

(15 citation statements)

References 46 publications

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Section: Characterization Of Mps By Size Shape and Coloursupporting

confidence: 93%

“…The remaining percentage corresponds to red, blue, green, yellow and purple. This is agreement with previous studies that analyse MPs in WWTPs where higher abundances of white and black MPs were also detected [40,48,74]. Figure 5 shows the percentages of MP classified by shape found in the different points of sampling: influent, secondary effluent and final effluent.…”

Section: Characterization Of Mps By Size Shape and Coloursupporting

confidence: 91%

“…In general, secondary effluent shows a notable decrease in MP concentration in comparison with those in influent (an average value of 1.90 ± 0.38 MPs/L), which means a removal efficiency (grit and grease removal + biological The WWTP receives in the influent, after screening systems, a mean concentration of 16.1 ± 3.3 MPs/L. This value is in accordance with other studies reporting similar MP concentrations in the influent of urban WWTP, for example, between 12-16 MPs/L in China [39][40][41], 12.2 MPs/L in Thailand [42], 15.1 MPs/L in Sweden [43] and 15.7 MPs/L in Scotland [44]. Nevertheless, it should be noted that other works reported MP concentration in influent samples much higher [45] or slightly lower [46] than those found in this work.…”

Section: Occurrence and Evolution Of Mpssupporting

confidence: 89%

“…The removal efficiencies found in the facility analysed in the present work were within the range reported in different European WWTPs (72-98%) [3,[57][58][59][60]. A wide variation can be found depending on the treatment technology used and the operating conditions in the WWTP [61], the origin and type of wastewater [20], as well as the sampling and identification methods used in the process, population density and regional development [40].…”

Section: Occurrence and Evolution Of Mpssupporting

confidence: 77%

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Long-Term Occurrence and Fate of Microplastics in WWTPs: A Case Study in Southwest Europe

et al. 2022

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Microplastic (MP) water pollution is a major problem that the world is currently facing, and wastewater treatment plants (WWTPs) represent one of the main alternatives to reduce the MP release to the environment. Several studies have analysed punctual samples taken throughout the wastewater treatment line. However, there are few long-term studies on the evolution of MPs over time in WWTPs. This work analyses the performance of a WWTP sited in Southwest Europe in relation with annual occurrence and fate of MPs. Samples were monthly taken at different points of the facility (influent, secondary effluent, final effluent, and sludge) and MPs were quantified and characterised by means of stereomicroscopy and FTIR spectrophotometry. The majority of MPs found in wastewater and sludge samples were fragments and fibres. Regarding to the chemical composition, in the water samples, polyethylene (PE), polyethylene terephthalate (PET) and polypropylene (PP) stood out, whereas, in the sludge samples, the main polymers were PET, polyamide (PA) and polystyrene (PS). The MPs more easily removed during the wastewater treatment processes were those with sizes greater than 500 µm. Results showed that the MPs removal was very high during all the period analysed with removal efficiencies between 89% and 95%, so no great variations were found between months. MP concentrations in dry sludge samples ranged between 12 and 39 MPs/g, which represented around 79% of the total MPs removed during the wastewater treatment processes. It is noticeable that a trend between temperature and MPs entrapped in sewage sludge was observed, i.e., higher temperatures entailed higher percentage of retention.

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Section: Characterization Of Mps By Size Shape and Coloursupporting

confidence: 93%

Section: Characterization Of Mps By Size Shape and Coloursupporting

confidence: 91%

Section: Occurrence and Evolution Of Mpssupporting

confidence: 89%

Section: Occurrence and Evolution Of Mpssupporting

confidence: 77%

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Long-Term Occurrence and Fate of Microplastics in WWTPs: A Case Study in Southwest Europe

et al. 2022

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“…In general, SeS is collected by grab sampling methods, often in different points of the bulk materials or for different times to ensure the statistical significance [11,32,33]. In many studies, the SeS is dried before starting the analyses [34][35][36]; in general, wet or dry samples are sieved with different meshes sieves to separate the plastic size fractions [37][38][39].…”

Section: Methodical Procedures Of Mps Detection In Sewage Sludgementioning

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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Occurrence of Microplastics in Wastewater Treatment Plants

and¹,

Li²

2022

Microplastics in Urban Water Management

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Abundance and removal characteristics of microplastics at a wastewater treatment plant in Zhengzhou

Cited by 54 publications

References 46 publications

Long-Term Occurrence and Fate of Microplastics in WWTPs: A Case Study in Southwest Europe

Long-Term Occurrence and Fate of Microplastics in WWTPs: A Case Study in Southwest Europe

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

Occurrence of Microplastics in Wastewater Treatment Plants

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