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PureLine's PureClO2™ Gas Series Generator Makes Controlling
Pathogens Easy and Effective for U.S. Cheese
Plant |
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GOALS
To disinfect water in the chill loop to prevent
food contamination
without fouling the system or causing corrosion.
SITE
A dairy in California.
HISTORY
The Dairy had a large process chilled loop
that frequently became contaminated with milk
products.
The milk products provided an excellent source
of food for a variety of bacteria. Since the
chilled loop
is considered a potential source of food contact,
the bacteria in the chilled water had to be
maintained below detectable limits to comply
with regulatory requirements. For twenty years,
the Dairy had used traditional biocides to
battle the problem, but they always eventually
fouled the system or caused corrosion.
Detectable levels of bacteria required immediate
emergency maintenance that caused a significant
increase operating costs and, at times, unscheduled
downtime. Yet, failure to take immediate action
could result in even greater product loss,
a shutdown mandated by state or federal regulators,
or the possible danger that there could be
a bacteria-related illness outbreak among
consumers that would lead to huge revenue
losses.
PROBLEM
For twenty years, the Dairy tried a variety
of non-oxidizing and oxidizing biocides in
an effort to remedy the problem. These were
industry-standard biocides easily available
to water treatment service providers. The
non-oxidizers proved to be ineffective in
terms of their cost and efficacy. These products
did not penetrate the slime layers that formed
in conditions found under the chilled water
loop. As a result, there was a rapid recovery
of the bacteria levels in the circulated water.
Frequent high-dose shock treatments were required
to treat the contamination, but these treatments
were costly and created a significant increase
in organic loading.
The oxidizing biocides used were all classified
as “surface burning agents.” The
organic loading in the chilled water created
a heavy demand on these agents. Feeding the
oxidizing biocides at dosages required to
meet this demand and achieve a successful
kill created corrosion throughout the system.
SOLUTION
The client purchased and installed a PureLine
PureClO2™ Gas Series Model HP-6E chlorine dioxide generator.
PureLine’s electrochemical chlorine dioxide
gas generation systems produce a pure gas
stream using just one precursor. Purecide
25 is exposed to a patented electrochemical
cell where it is converted into a chlorine
dioxide solution by applying current and separating
the resulting by-products using proprietary
 membrane
technology. The pure chlorine dioxide gas
is then stripped from the solution using an
eductor and proprietary stripping column.
The pure chlorine dioxide gas is immediately
introduced into the water or air stream to
be treated. The generators are equipped with
a state-of-the-art control package that makes
operating the system easy and allows for immediate
automatic response to disinfectant demand
.
PureLine’s safe and reliable method for
generating chlorine dioxide provided the Dairy
with an alternative to the biocides it had
been using. Safe, pure, effective chlorine
dioxide did not add to the organic loading
or produce significant corrosive salts or
outside fluids. Pure chlorine dioxide gas
proved to be highly efficient kill agent even
at low dosages, and was completely compatible
with the existing treatment program formulations.
The chlorine dioxide was able to penetrate
and eliminate the slime formations without
attacking system metallurgy. Because PureLine’s
proprietary on-line control system automatically
monitors the system for any contamination,
maintaining the system’s cleanliness
was made much easier and prevented unexpected
emergency maintenance or shutdowns.
RESULTS
PureLine’s innovative chlorine dioxide
generation technology and control instrumentation
combined with the company’s professional
service program resulted in a successful treatment
solution that was easy for plant operators
to implement even with the schedule constraints
typical at today’s dairy production facilities.
Safe and reliable technology combined with
professional support services virtually eliminated
plant maintenance requirements. Daily routine
system monitoring was reduced to less than
10 minutes
per day.
For less than $2,500 per month, the Dairy
now receives a comprehensive packaged solution
that includes a full-service agreement along
with an open-cooling system disinfection application
that is safe for continuous critical food
contact. PureLine’s overall program fees
are very competitive with other traditional
treatments the Dairy used in the past. However,
better efficacy and system protection, a reduction
in unscheduled maintenance, and easy implementation
have all made PureLine’s chlorine dioxide
gas generator a much more cost-effective solution
to Diary’s problems.
CONCLUSION
PureLine’s line of safe, reliable and
highly effective chlorine dioxide gas generators
serve as an alternative to biocide in applications
where there are:
» persistent pathogens
» heavy organic or other contaminant
loading
» system conditions that reduce contact
time
» extended system retention time with
oxidant-sensitive treatment formulations and
system metallurgy
and where potable acceptance
may affect the efficacy and application of
traditional biocides.
As a result, PureLine’s chlorine dioxide
gas generators offer ideal disinfection solutions
for drinking water, chilled water, process
waters, industrial and municipal wastewater,
reclaimed water, air emissions control, re-used
and water conservation applications. |
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