管道表面的和铁氧化物促进了饮用水分配系统中溶解的积累
Guiwei Li1, Qi Chen1, Yue Zhou2
1Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
The Science of the total environment
|March 16, 2024
概括
溶解的很容易沉积在涂有和氧化铁的饮用水管道上,特别是在未经消毒的情况下. 生物膜和金属氧化物在饮用水分配系统 (DWDS) 中的积累中发挥着关键作用.
科学领域:
- 环境科学 环境科学
- 水的化学 水的化学
- 材料科学 材料科学 材料科学
背景情况:
- 含的沉积物在饮用水分配系统 (DWDS) 中很常见.
- 溶解转化为管道沉积物的机制尚未完全理解.
- 了解这些机制对于管理水质和基础设施完整性至关重要.
研究的目的:
- 研究DWDS中溶解积累的机制.
- 确定影响管道表面沉积的因素.
- 提供对控制DWDS中的矿存量的策略的见解.
主要方法:
- 批量实验使用合成的金属氧化物和实际的成品水.
- 用PVC和铁管进行长期管道实验.
- 分析不同pH值下金属氧化物和生物膜吸收溶解的情况.
- 在各种消毒条件下的沉积的比较 (化,胺化,非消毒).
主要成果:
- 溶解的在性pH下,在干净的PVC管道上显示出最小的沉积.
- (Mn) 和铁 (Fe) 氧化物显著增强了溶解的吸收和沉积.
- 管道表面上的生物膜也促进了溶解的积累.
- 腐蚀的铁管与铁的腐蚀产品容易积累的.
- 没有消毒的条件有利于在铁管道上沉积颗粒,这可能是由于生物膜固定.
- 铁管中不断积累的导致铁的释放到水中增加.
结论:
- 金属氧化物 (Mn和Fe) 在含有这些固体的DWDS中溶解的积累中至关重要.
- 生物膜在增强沉积方面发挥着重要作用.
- 消毒策略可以影响沉积动态.
- 这些发现为沉积物形成和DWDS潜在的控制策略提供了新的视角.
更多相关视频
11:43Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers
Published on: March 24, 2023
1.3K
04:48Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII
Published on: May 4, 2020
8.1K
相关概念视频
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.0K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.0K
01:06Coagulation
292
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
292
00:56Extraction: Advanced Methods
446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
04:01Factors Affecting Solubility
33.4K
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:
33.4K
02:49Corrosion
24.2K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
24.2K
03:24Common Ion Effect
41.7K
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 Châtelier’s principle. Consider the dissolution of silver iodide:
41.7K