This highly technical and precise market in all its processes needs very specific and effective disinfection and water treatment systems
In ultrapure water systems, UV technology, in combination with ozone, provides an improved synergistic approach toward reducing trace amounts of
organic compounds (TOC), which are the most difficult to control in a water system of these characteristics.
Ozone is often used as a supplemental disinfectant. Residual ozone must then be removed using UV at 254 nm wavelength.
Ozone absorbs UV energy, quickly dissipating and breaking down into O2 molecules. As a general reference,
1 ppm of ozone can be removed
with
a UV dose of 90 mJ/cm2.
Equally important is the efficient use of water through strategies for the recovery of process water and the reuse of waste water. In the first case, through the capture and
reuse of water used in cooling, data centers can reduce their dependence on fresh water sources. While in waste water reuse systems, this effluent can be
reused in the cooling process, decreasing the demand for new water and reducing the overall water footprint.
Most common applications
Desinfection
This is the most common application of UV in water treatment. A UV unit can significantly reduce microbe counts by destroying the
least 99.9% of the bacteria present in the influent flow.
The water line for microelectronics applications could have several points where UV equipment can be installed. Some typical installation locations would be
downstream of the carbon filter and/or directly upstream of the OI plant. Disinfection of the process distribution loop is also recommended.
-to the delivery, the return and even both- as well as the previous storage tank.
TOC reduction
Ultraviolet (UV) systems are used for the effective reduction of organics, commonly known as TOC (total organic carbon).
TOC reduction is achieved through a powerful UV system at
185nm wavelength, appropriately designed and sized for compliance
of this application, as well as strategically located in combination with other equipment.
Carbon dioxide is a typical byproduct of the TOC reduction process, which results in a decrease in water resistivity. While the majority
of organic molecules are oxidized into carbon dioxide and water molecules, other more resistant species become ionized or weakly charged, after absorbing
the UV. Therefore, polishing deionization (DI) beds are typically placed downstream of TOC reduction units, so that they not only remove
charged/ionized organics, but also restore the resistivity of the water.
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Ozone Destruction
Ozone is commonly used in water line pretreatment, as well as for the sanitization process and recirculation circuits. Nevertheless,
Before the point of use, residual dissolved ozone has to be destroyed to ensure that the process water is not compromised.
UV technology is the preferred method for this application mainly because it is a non-chemical and fast-reacting process.
After taking the appropriate design parameters, choosing the appropriate UV unit guarantees ozone destruction to non-detectable values,
ensuring the integrity of the process and product. For the destruction of 1.0 ppm of residual ozone it is recommended
a UV dose of 90 mJ/cm2.
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Chlorine / Chloramine Destruction
UV radiation allows these problems to be solved while destroying chlorine, occupying a small surface area and reducing maintenance costs.
In addition, popular methods of removing chlorine and chloramines, such as carbon beds or chemical injection, have proven to be problematic.
Sodium metabisulfite involves the elimination of one chemical substance through the use of another, generating food for microorganisms, while
Coal beds can be inefficient, vulnerable to preferential channel formation, providing a breeding ground for microorganisms.
The application of
UV radiation technology for the destruction of chlorine and chloramines
pre-membrane filtration and RO for the
Water conditioning is establishing itself as the most sustainable alternative.
Mobile Plants (for rent)
The
AquaMobile© rental system can meet emergency or long-term water needs in municipal and industrial applications.
Containerized systems are quickly and easily installed to begin producing high-quality water within four hours of arrival on site.
AquaMobile© is an ideal solution to supplement or replace your existing water treatment system, whether to meet permanent or temporary needs.
✓ Emergency situations
✓ Failures in existing equipment
✓ Seasonal water demand surges exceeding system capacity
✓ Planned interruptions due to maintenance, upgrade or replacement of the existing system
Wide range of technologies:
• Lamellar decantation
• Sand bed / drum filtration
• Desalination / RO
• Ion exchange
• Evaporation and crystallization
• MF/ UF
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Typical Water Line Scheme in Microelectronics
