微塑料在批量和动态凝结-花-沉系统中的去除受花大小的控制
Malik M A Awan1, Tyler Malkoske1, Husein Almuhtaram1
1Department of Civil and Mineral Engineering, University of Toronto, Toronto, ON M5S 1A4, Canada.
The Science of the total environment
|November 17, 2023
概括
传统的瓶子测试高估了微塑料 (MP) 清除效率. 最佳的MP降低依赖于氧化的形成,但连续流系统显示的去除率低于批量测试. 度的减少与MP的去除有很强的相关性.
科学领域:
- 环境科学 环境科学
- 水处理工程水处理工程
- 材料科学 材料科学 材料科学
背景情况:
- 大多数微塑料 (MP) 清除研究使用高剂量的凝固剂,模仿扫,使其他条件未得到研究.
- 基板级容器测试是常见的,但它们的批量水力动力学与全规模的连续流系统有很大的不同.
- 不同的操作条件对水处理中的MP去除的影响在很大程度上是未知的.
研究的目的:
- 通过使用传统的瓶子测试和连续流量板尺度系统来评估微塑料的去除.
- 在不同的凝血条件下确定最佳的pH和剂量,以减少MP.
- 为了比较批量和连续流水处理模型之间的MP去除效率.
主要方法:
- 进行了用不同尺寸和类型的微塑料进行试验,以确定最佳的pH和剂量,以减少MP.
- 采用连续流量基板尺度系统来比较MP去除与测试结果.
- 分析了微塑料度,度降低和特征 (大小和度) 之间的相关性.
主要成果:
- 氧化 (Al(OH) 3) 叶片的生产是微塑料去除的主要驱动因素.
- 与试验相比,连续流试验显示了较低的MP总去除,这表明性能可能过度预测.
- 在MP度和度降低之间发现了强烈的相关性,这表明度是可行的替代品.
- 叶群大小 (第90百分点直径) 和较大叶群 (>100微米) 的度和MP减少之间存在显著的相关性.
结论:
- 从容器测试中直接推断微塑料去除到全面性能可能是不可靠的.
- 降低度可以作为监测微塑料去除效率的有用替代品.
- 流体特征,特别是较大的流体大小,是水处理中有效去除微塑料的关键指标.
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