加拿大生物固体中存在多少微塑料颗粒?
Branaavan Sivarajah1, David R Lapen2, Sarah B Gewurtz3
1Department of Geography and Environmental Studies, Carleton University, Ottawa, Ontario, Canada.
Journal of environmental quality
|June 10, 2023
概括
微塑料颗粒通过经过处理的污水污泥 (生物固体) 进入加拿大农田. 生物固体中的度明显高于之前报告的,突出显示了陆地微塑料污染的关键途径.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 土壤科学 土壤科学
背景情况:
- 对农田的处理污水污泥 (生物固体) 应用是微塑料颗粒 (MP) 进入陆地生态系统的已知途径.
- 以前对加拿大生物固体中微塑料度的估计仅限于来自四个废水处理厂 (WWTP) 的样本.
研究的目的:
- 量化加拿大生物固体中的微塑料度,解决一个重要的知识差距.
- 为了比较不同地理区域的生物固体中的微塑料含量,WWTP类型和污泥处理过程.
主要方法:
- 从加拿大九个省份的22个WWTP收集和分析了生物固体样本.
- 在每个样本中,每克干重的量化微塑料颗粒.
- 识别和分类的微塑料类型 (纤维,碎片).
主要成果:
- 所有分析的生物固体样本都含有大量的微塑料度 (2281353颗粒/g干重;中位数为636颗粒/g).
- 微塑料度比国际上以前报告的生物固体高出数量级.
- 纤维构成了占主导地位的MP类型 (中位数为86%),其次是碎片 (中位数为13%).
- 根据地理区域,WWTP类型或污泥处理,没有发现MP度的显著差异.
结论:
- 加拿大生物固体的微塑料度比以前理解的要高得多,对陆地生态系统构成相当大的风险.
- 微塑料度的变化似乎受到当地污水区特征,WWTP过程和运营因素的复杂相互作用的影响.
- 这些发现强调了将生物固体视为陆地环境中微塑料污染的主要来源的重要性,并需要进一步研究管理策略.
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