With tight security and restricted access, biohazard lab facilities need ultrapure water treatment systems that can be serviced without compromising water quality, human safety or the facility’s environment.
Water used in research at these laboratories needs to be extremely pure, but
tap water typically contains particulates, dissolved organics and dissolved
inorganics, which can impact the testing results. To remove the contaminants
and ensure water quality that meets ASTM standards, it must be treated with a
combination of technologies.
To meet the special needs of biohazard laboratories, Siemens Water
Technologies, Shrewsbury, Mass., offers a standard ultrapure water treatment
system, which includes a pretreatment cartridge to remove chlorine and
particulates; a reverse osmosis system with storage reservoir; and an ultrapure
lab-water polishing system. The system meets 18.2 MΩ ultrapure water with less than 3 ppb total organic carbon and
less than 0.001 EU/ml endotoxin levels. When fitted with an optional bioguard
filter, the system further removes biological contamination.
In addition, the system is self-contained on a single roller cart that can
be transported from the laboratory to a decontamination area or out to an
engineer for servicing. The system is fed from a tap-water source.
Incoming tap water enters the water treatment system through external and
internal pretreatment cartridges to remove chlorine and particulates. The water
then flows into the reverse osmosis membranes, where organics, total dissolved
solids and bacteria are reduced. Reverse osmosis cartridges remove 95 percent
of the monovalent ions and 98 percent of the divalent ions as well as organics
with a molecular weight greater than 200.
The product water then feeds into the storage reservoir, where the
pre-purified water is pumped to the laboratory's water-polishing unit, at which
point it flows through deionization packs that remove oxidized organics and
ions. Then the water flows through a dual-wavelength ultraviolet sterilizer, which
disinfects the water and reduces total organic carbon levels. The water
undergoes a final ultrafiltration purification step to remove pyrogens and
nucleases. An optional point-of-use bioguard filter can be added for microbial
reduction at the dispense point.
For more information, go to www.water.siemens.com.
Making Lab's Tap Water Ultrapure
July 27, 2011