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Quantitatively tracing microplastics in sewage sludge using thermodesorption gas chromatography/mass spectrometry combined with pyrolysis
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Researchers developed a mass-based method using pyrolysis combined with thermal desorption gas chromatography to trace microplastics through sewage sludge treatment processes. They found that total microplastic concentrations dropped from about 8,700 micrograms per gram in primary sludge to roughly 470 micrograms per gram in final treated sludge. Centrifugal dewatering was the most effective step for removing microplastics, while thermal hydrolysis and anaerobic digestion had minimal impact.
Sewage sludge is a major source of environmental microplastics. To address this issue, a reliable mass-based methodology was developed for the identification and quantification of five frequently detected microplastics in sewage sludge-polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), and polyethylene terephthalate (PET)-using pyrolysis combined with thermal desorption gas chromatography/mass spectrometry (Py-TD-GC/MS). The method achieved detection limits ranging from 0.14 μg to 3.70 μg and was utilized to assess microplastics removal during wastewater and sludge treatment processes, covering sizes from 0.22 μm to 5.00 mm. Total microplastics concentrations decreased from 8714.59 ± 228.48 μg/g dry weight (dw) in primary sedimentation sludge to 3828.41 ± 557.92 μg/g dw in secondary sedimentation sludge, with PE, PET, and PVC as the dominant polymers. Size- and polymer-dependent deposition patterns were noted during wastewater treatment. Further treatments-including centrifugal dewatering, thermal hydrolysis, anaerobic digestion, and compression dewatering-reduced microplastics concentrations from 6033.18 ± 77.94 μg/g dw in raw sludge to 470.82 ± 48.08 μg/g dw in final sludge. Centrifugal dewatering significantly removed microplastics while thermal hydrolysis and anaerobic digestion had minimal effects. This study establishes a robust methodology for quantifying microplastics in sludge and insights into their removal processes, aiding source prevention for microplastics contamination.
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Researchers investigated what happens to microplastics embedded in sewage sludge when sludge is treated by pyrolysis, a high-temperature thermochemical process. Pyrolysis effectively destroyed most microplastic particles, but some residual polymer-derived compounds partitioned into the pyrolysis products.
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Researchers used pyrolysis gas chromatography-mass spectrometry to measure the mass concentration of both microplastics and nanoplastics at different stages of wastewater treatment. They found that treatment plants removed over 93% of microplastics and nanoplastics by mass, but measurable amounts still remained in treated effluent. The study provides important data on nanoplastic levels in wastewater, which have been largely unmeasured due to limitations of previous detection methods.
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Researchers quantified microplastic mass concentrations in three Australian wastewater treatment plants using pyrolysis-GC/MS, finding 840-3116 micrograms per liter in raw influent with over 99% removal by mass during pre-treatment stages.
Fate of microplastic during pyrolysis of sewage sludge
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Researchers examined how pyrolysis as a sewage sludge treatment method affects the fate of embedded microplastics, finding that thermal treatment largely destroys plastic particles. However, some polymer-derived volatile compounds transferred to pyrolysis gases and oils, suggesting that microplastic destruction does not eliminate all associated chemical risks.
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