相关实验视频

Updated: Jul 4, 2025

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Published on: April 18, 2019

在多障碍先进的净水系统中去除和多基物质,以进行间接的饮用再利用

Lin Li¹, Laura Haak¹, Tatiana C Guarin^1,2

¹Department of Civil and Environmental Engineering, University of Nevada, Reno, Nevada, USA.

Water environment research : a research publication of the Water Environment Federation

|January 31, 2024

概括

先进的水处理有效地去除长链和多基基物质 (PFAS),但与短链化合物作斗争. 颗粒活性炭 (GAC) 显示在水再利用应用中减少PFAS的最大希望.

科学领域:

环境化学环境化学
水处理技术水处理技术
环境科学环境科学

背景情况:

和多醇基物质 (PFAS) 是水中发现的持久性环境污染物.
来自水回收设施 (WRF) 的二次废水可能含有大量的PFAS.
了解各种先进水处理 (AWT) 过程中的PFAS去除对于安全的饮用水再利用至关重要.

研究的目的:

评估不同的AWT工艺在从WRF二次废水中去除PFAS方面的有效性.
确定哪些PFAS化合物是最难去除的.
为 PFAS 污染水的有效处理策略的制定提供信息.

主要方法:

现场测试AWT列车,包括凝血-花-澄清-过,臭氧化,生物活性炭 (BAC) 过,颗粒活性炭 (GAC) 过和紫外线处理.
在几个月内收集的二次废水和处理水样本中分析PFAS度.
量化各种PFAS化合物,包括 perfluorocarboxylic 酸 (PFCAs) 和 perfluoroalkanesulfonates (PFSAs) 在内.

主要成果:

PFCAs,特别是PFPeA,是二次废水中占主导地位的PFAS,PFSA存在的度较低.
凝血-花-澄清-过显示了最小的PFAS减少.
臭氧化导致某些短链PFAS (PFBS,PFBA) 的度增加.
通过BAC过,长链PFAS被清除,但短链PFAS度增加.
GAC过非常有效,去除了大多数PFAS,但短链PFCAs仍然存在.
紫外线处理没有显著地去除短链PFCA.

结论:

AWT过程,特别是GAC,可以显著降低长链PFAS度,以便可供饮用再利用.
短链PFAS,包括PFCAs和PFBA,对当前的AWT流程构成重大挑战.
臭氧化和BAC过可能无意中增加短链PFAS水平.
需要量身定制的治疗策略,以应对短链PFAS的持续性.

关键词:

PFAS (多-和多-基基物质) 的使用情况先进的水处理列车列车.废水中的度.在试点规模进行治疗.饮用饮料可重复使用.

更多相关视频

Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique

Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique

Published on: September 28, 2022

A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.

A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.

Published on: July 9, 2012

相关概念视频

Drug Elimination by Renal Route: Tubular Reabsorption

Drug Elimination by Renal Route: Tubular Reabsorption

During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, lipophilic, and nonionized undergo passive reabsorption from the tubular fluid into the surrounding peritubular capillaries. This reabsorption process restricts their elimination through the kidneys. However, the majority of drugs are either weak acids or weak bases, and their ionization level is dependent on pH. By altering the pH of urine, the...

Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...