使用基于酸盐的混合氧化剂从固体中去除和回收重型石油的改进过程
Yurou Guo1, Peng Lv1, Juan Li1
1School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
Environmental research
|February 28, 2024
概括
一种新的绿色氧化剂 (PFI) 显示出对石油污染土壤的处理有希望. 混合溶剂提取氧化工艺提高了高油性土壤的效率,而PFI有效地处理低油性污泥以满足国家标准.
科学领域:
- 环境科学 环境科学
- 绿色化学 绿色化学
- 土壤修复土壤的修复.
背景情况:
- 硫酸盐氧化剂在土壤和废水处理中很常见,但与重型多环芳 (PAHs) 斗争.
- 现有的方法显示,在含油量高 (>10%) 的土壤中,重型石油成分的降解程度有限 (<30%).
- 土壤表面的氧化铁涂层在高油污染场景中阻碍了氧化剂效率.
研究的目的:
- 评估一种新的绿色过氧化硫酸铁酸盐 (PFI) 氧化剂,用于修复受石油污染的土壤.
- 研究高油含量土壤中PFI氧化的局限性,并提出混合修复策略.
- 评估PFI在处理含有低石油含量的油性污泥中的有效性.
主要方法:
- 开发和应用一个绿色的过氧硫酸-铁酸盐 (PFI) 氧化剂.
- 实施混合工艺,涉及预溶剂提取 (使用二甲),然后PFI氧化和酸性洗.
- 使用PFI氧化剂对低油含量污泥降解的动力分析.
主要成果:
- 在环境条件下通过双重激活,PFI氧化剂有效降解重型石油分子.
- 一种混合溶剂提取-氧化工艺在高油含量土壤中实现了90%以上的石油回收和80%的氧化效率.
- PFI氧化剂成功地将低油含量油性污泥 (<2%) 处理到低于0.3%重量的石油,符合国家标准.
结论:
- 在高油含量土壤中,由于氧化铁涂层,PFI氧化剂的有效性是有限的,因此需要采用混合方法.
- 拟议的混合工艺克服了涂层的局限性,提高了石油回收和氧化效率.
- PFI氧化剂在石油污染的土壤和油性污泥中具有广泛的适用性,低油含量污泥的伪第一阶动力学后降解.
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