冻融循环下聚丙烯微塑料在雨水生物过滤器中的流动性

IF 6.6 Q1 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials letters Pub Date : 2022-11-01 DOI:10.1016/j.hazl.2022.100048
Vera S. Koutnik , Annesh Borthakur , Jamie Leonard , Sarah Alkidim , Hatice Ceylan Koydemir , Derek Tseng , Aydogan Ozcan , Sujith Ravi , Sanjay K Mohanty
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引用次数: 10

摘要

雨水生物过滤器自然经历干湿和冻融循环,这可以重新移动沉积的颗粒污染物,包括微塑料。然而,这些自然风化条件对沉积微塑料迁移性的影响尚未得到评价。我们将微塑料沉积在用沙子或沙子与土壤的混合物(体积比为25%)填充的柱上,以模拟生物过滤介质,使其遭受间歇性渗透事件,并被冻融循环或干燥循环打断。对比两种处理后生物过滤器中微塑料的垂直分布,我们发现90%以上的微塑料保留在过滤介质的前3cm内,但在较深层的分布因介质类型和处理条件而异。冻融循环比干湿循环更有效地增加沉积微塑料的向下迁移率。我们将这些结果归因于通过扩大冰晶破坏过滤介质,这可能会释放沉积的胶体和相关的微塑料。冻融处理后出水中天然胶体浓度的增加证实了这一假设。该结果可用于预测雨水生物过滤器根区或经历自然冻融循环的污染土地的微塑料运输。
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Mobility of polypropylene microplastics in stormwater biofilters under freeze-thaw cycles

Stormwater biofilters naturally experience dry-wet and freeze-thaw cycles, which could remobilize deposited particulate pollutants including microplastics. Yet, the effect of these natural weathering conditions on the mobility of deposited microplastics has not been evaluated. We deposited microplastics on columns packed with sand or a mixture of sand with soil (25% by volume) to simulate biofilter media, subjected them to intermittent infiltration events punctuated by either freeze-thaw cycles or drying cycles. Comparing the vertical distribution of microplastics in biofilters after both treatments, we showed that more than 90% of microplastics were retained within the first 3 cm of filter media, but the distribution in deeper layers varied with media type and treatment conditions. Freeze-thaw cycles were more effective than dry-wet cycles in increasing the downward mobility of deposited microplastics. We attributed these results to the disruption of filter media by expanding ice crystals, which could release deposited colloids and associated microplastics. An increase in natural colloid concentration in the effluent following freeze-thaw treatments confirmed the hypothesis. The results are useful in predicting microplastic transport in the root zone in stormwater biofilters or contaminated land experiencing natural freeze-thaw cycles.

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来源期刊
Journal of hazardous materials letters
Journal of hazardous materials letters Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry, Waste Management and Disposal, Environmental Engineering
CiteScore
10.30
自引率
0.00%
发文量
0
审稿时长
20 days
期刊最新文献
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