酸盐添加对饮用水PFAS处理性能的影响
Levi M Haupert1, Adam Redding2, J Margaret Gray3
1Office of Research and Development, Center for Environmental Solutions and Emergency Response, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA.
概括
整合新的水处理工艺,如离子交换 (IX) 和颗粒活性炭 (GAC),需要评估它们对清除和多基物质 (PFAS) 的影响. 酸盐添加可以降低PFAS的IX容量,强调考虑整个处理列车的重要性.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 分析化学 分析化学
背景情况:
- 在饮用水处理中实施新的单位操作需要评估有效性,成本和与现有流程的相互作用.
- 公用事业公司面临的挑战在于去除多基和多基物质 (PFAS) 以及挥发性有机污染物.
- 了解上游工艺对新型污染物去除的影响,对于有效的系统设计至关重要.
研究的目的:
- 评估离子交换 (IX) 和颗粒活性炭 (GAC) 对于PFAS去除的性能.
- 调查上游空气剥离和酸盐添加对PFAS处理有效性的影响.
- 在各种治疗场景下建模和预测IX和GAC的性能.
主要方法:
- 使用IX和GAC过系统进行了试点规模的研究.
- 在处理前和处理后监测水质参数,包括PFAS度.
- 酸盐添加和空气剥离被实施为上游处理步骤.
- 使用数学建模来适应试点数据和预测治疗性能.
主要成果:
- 颗粒状活性炭 (GAC) 在PFAS去除方面表现一致,不管水在空气剥离之前或之后是否经过处理.
- 在空气剥离前添加酸盐导致某些PFAS化合物的离子交换介质 (IX) 容量显著减少 (15%-25%).
- 建模为治疗列车相互作用和性能预测提供了宝贵的见解.
结论:
- 使用IX和GAC去除PFAS的有效性受上游处理过程的影响.
- 酸盐的添加可能会对IX的PFAS去除性能产生负面影响,这强调了需要仔细设计处理列车的必要性.
- 考虑整个水处理系统的整体方法对于成功实施新的污染物清除装置操作至关重要.
更多相关视频
09:04Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
Published on: April 18, 2019
12.5K
07:06Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique
Published on: September 28, 2022
1.6K
相关概念视频
Factors Affecting Solubility
33.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.5K
The Phosphorus Cycle
36.9K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
36.9K
Phosphorylation
50.3K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
50.3K
Phosphate Buffer
1.4K
The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
1.4K
