在日本的污泥处理过程中微塑料的行为和流动
Sai Liu1, Kazuyuki Oshita1, Wenjing Guo1
1Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Japan.
The Science of the total environment
|November 15, 2024
概括
污水处理厂 (WWTP) 是微塑料 (MP) 的重要来源. 这项研究优化了污泥中的MP分析,揭示了MP在整个处理过程中存在,PMMA,PE和PS是最常见的.
科学领域:
- 环境科学 环境科学
- 水处理工程水处理工程
- 聚合物科学 聚合物科学
背景情况:
- 微塑料 (MP) 污染是一个重大的环境问题,特别是在城市地区.
- 污水处理厂 (WWTP) 被确定为MP释放到环境中的主要贡献者.
- 了解WWTP中的MP命运对于减轻其生态影响至关重要.
研究的目的:
- 优化在污水污泥中检测微塑料的分析方法.
- 量化不同污泥处理单元内的微塑料度和类型.
- 为了估计微塑料在整个污泥处理过程中的流量和分布.
主要方法:
- 优化了利用超声波预处理和双重消化对污水污泥的微塑料分析方法.
- 采样了来自两个大阪水处理厂的各种处理阶段的污泥和分离水.
- 提取,识别和量化大于100微米的微塑料,记录它们的尺寸和类型.
主要成果:
- 在所有污泥处理阶段检测到微塑料,确定了13种类型.
- 污泥呈现出高MP度 (816470颗/kg干污泥),而分离水的度较低 (01740颗/kg干污泥).
- 几乎所有的MP都被保留在加厚/脱水的污泥中,只有5-10%返回初级沉积池.
结论:
- 优化的方法证明了从污水污泥中回收微塑料的高效率.
- 聚甲基甲酸 (PMMA),聚乙烯 (PE) 和聚烯 (PS) 是主要发现的微塑料类型.
- 微塑料颗粒尺寸分布在整个污泥处理过程中基本上保持一致,这表明在早期阶段,如砂室,可以进行清除.
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