基于密度浮选和油提取的土壤微塑料分离方法研究

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Abstract To compare the characteristics of soil microplastic separation methods which could meet different usage requirements, this study conducted 12 experimental treatments (S1~S12) based on the density flotation and oil extraction methods, by analyzing the extraction efficiency and cost of microplastics comprehensively, including seven types of microplastics (PP; PE; PS; ABS; PC; PVC; PET) and three particle sizes (2~5mm; 1~2mm; 0.5~1mm). The results showed that:There are differences in the extraction efficiency among extraction methods. Specifically, the extraction efficiency of density flotation (S2~S4) ranged from 89.93% to 96.35% and was significantly influenced by the density of the flotation liquid. The extraction efficiency of the oil extraction method (S5~S10) ranged from 78.57% to 93.33% and was affected by the type of extraction oil (P<0.05), with no significant impact from the amount of oil used (P>0.05). As the density of microplastics increased, the extraction efficiency of the oil extraction method gradually decreased, and it exhibited specific selectivity based on microplastic particle size. The highest extraction efficiency for microplastics was achieved when the particle size was in the range of 1~2mm, exceeding 90%, while extraction efficiency significantly decreased for particle sizes >2mm. The combination of density flotation and oil extraction methods could increase the extraction efficiency of microplastics and reduced differences among different particle sizes, resulting in a more stable extraction effect. Considering both extraction efficiency and cost, three extraction methods were selected to meet different usage requirements:the economical method (S5), the balanced method (S2), and the high-energy method (S3).

Key words： soil microplastics density flotation oil extraction economical efficiency

Received: 13 March 2023

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X53

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	Articles by authors
	ZUO Zhen-jiang
	WANG Ju
	WANG Yan-hui
	XU Ming-xiang

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ZUO Zhen-jiang,WANG Ju,WANG Yan-hui等. Research on soil microplastic separation methods based on density flotation and oil extraction[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5954-5960.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5954

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