Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 420, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126671
Keywords
Thermal treatment; Polyester microfibers; Soil bio-physical properties
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Funding
- National Natural Science Foundation of China [41867024]
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This study investigated the effects of thermal treatment on soil properties, enzymatic activities, and microbial communities in polyester-microfibers contaminated soils. Results showed that polyester microfibers influenced soil physical properties and microbial communities regardless of thermal treatment, with even dose-effects observed following thermal treatment. The findings may guide the development of viable methods for remediating soils contaminated with microplastics.
Soilborne microplastics can persist for decades and their consequences are of growing concern. Therefore, it is important to explore the feasible approaches for eliminating microplastic effects on soil properties. Through an incubation experiment, we evaluate the effects of thermal treatment on physical properties, enzymatic activities and microbial communities in polyester-microfibers contaminated soils. The effects of polyester-microfiber levels (0%, 0.1%, 0.3% and 1.0% of soil dry weight) on soil properties were detected under not heated (PMF), heated (mPMF) and added with natural-organic-matters (OM) following heated (mPMF+OM) conditions. Our results showed that 1.0% mPMF soil had lower bulk density and higher mean weight diameter than 0% mPMF soil, akin to PMF soils. Meanwhile, great volumes of < 30 mu m pores in 0.3% and 1.0% mPMF soils were observed than that in 0% mPMF soil. Additionally, the dose-effects of melted polyester-microfiber on soil enzymatic activities and bacterial communities were still observed following thermal treatment, even under the OM added condition. Furthermore, our results demonstrated that polyester microfibers influenced soil microbial communities and functioning via altering specific soil physical properties, regardless of thermal treatment or not. Results of this study should be useful to guide further develop viable methods for remediating soils contaminated with microplastics.
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