Here is a look at the 6 kind of methods used to pretreat water in the purification process necessary to use it in a cleanroom laboratory.
There’s water purification that produces Type 1, or ultrapure water, but equally important is the pretreatment step that results in Type 2 water. Pretreatment actually removes most of the contaminants in tap water. This step needs to be relied upon consistently, yet it is often overlooked. To ensure your water is purified to the highest possible standard, be sure to use a combination of the following technologies:
- Distillation. This removes a wide range of contaminants, but it requires large volumes of tap water and electrical energy. This method of purification is relied on much less today as contaminants are carried into the condensate.
- Reverse osmosis. The efficiency of this method varies among contaminants, but it is capable of removing the bulk of most of them.
- Ion exchange resins. This effectively removes dissolved inorganics (ions) and charged organics. It doesn’t remove neutral organics, bacteria, or particles, however.
- Electrodeionization. This process deionizes water while the ion exchange resins are continuously regenerated by the electric current in the unit.
- Activated carbon. There are two forms of this: natural and synthetic. Natural activated carbon has a high concentration of ionic contaminants. It’s only used as a preliminary step to remove chlorine from water. Synthetic activated carbon is much cleaner, and used to remove trace organics of low molecular weight.
- Germicidal UV. Ultraviolet radiation inactivates microorganisms and prevents microbial growth and contamination. This is a widely used germicidal treatment for water.
In our next article, we will discuss the best combination of methods to produce Type 2 water. If you have questions about cleanrooms or need certification or validation, contact Gerbig Engineering Company. We care about your success. 888-628-0056; email@example.com