一种合成和透明的粘土有效地去除Microcystis aeruginosa
Yuan Li1, Miki Hondzo1, Judy Q Yang1
1University of Minnesota, Minneapolis, MN, USA; Department of Civil, Environmental, and Geo Engineering, University of Minnesota, Minneapolis, Minnesota, USA.
Harmful algae
|July 13, 2024
概括
拉波尼特粘土有效地去除有害的藻类繁殖 (HABs) 在明显低于自然粘土的度. 这种合成粘土提供了一种具有成本效益的解决方案,用于减轻水生生态系统中的Microcystis aeruginosa.
科学领域:
- 环境科学 环境科学
- 水处理技术水处理技术
- 生态毒理学 生态毒理学
背景情况:
- 有害的藻类繁殖 (HABs),通常是由Microcystis aeruginosa引起的,对水生生态系统,人类健康和经济构成重大风险.
- 粘土藻类花是一种新兴的HAB缓解策略,利用粘土聚合和去除藻类细胞.
- 已经探索了本托尼特和高利尼特等天然粘土及其改性形式,但它们的效率和成本效益各不相同.
研究的目的:
- 为了评估拉波尼特的有效性,一种合成的石灰泥,在从水中去除Microcystis aeruginosa细胞.
- 为了比较拉波尼特的细胞去除效率与天然 (本托尼特,高尼特) 以及它们的聚化 (PAC) 修改版本.
- 评估laponite在现实水生环境中的HAB缓解方面的成本效益和实际适用性.
主要方法:
- 用拉波尼特,本托尼特,考利尼特和它们的PAC修改对应物进行了粘土藻类花试验.
- 确定了最佳的粘土度,以实现80%的Microcystis aeruginosa细胞的去除.
- 细胞去除效率进行了比较,并研究了基本机制,如颗粒大小和接触率.
- 在Powderhorn湖的水样上进行了实地测试,以验证laponite的性能.
主要成果:
- 拉波尼特表现出优异的性能,需要显著降低度 (0.05 g/L) 达到80%的Microcystis aeruginosa细胞去除,相比本托尼特 (2 g/L) 和高尼特 (4 g/L).
- 拉波尼特所需的材料比天然粘土少40至80倍,比PAC修饰的高酸少6倍,以获得同等的去除效率.
- 拉波尼特的增强性能归因于其较小的颗粒大小,导致与藻类细胞的接触率更高.
- 拉波尼特被证明有效地从实际的湖水样本中去除HAB.
结论:
- 拉波尼特是一种高效和具有成本效益的药物,可以缓解有害的藻类繁殖,特别是由Microcystis aeruginosa引起的藻类繁殖.
- 与天然和改性粘土相比,其优越的性能使其成为大型水处理应用的有希望的替代品.
- 拉波尼特的合成,可降解性质和较低的所需剂量为HAB管理提供了重要的环境和经济优势.
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