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Bringing UV Into Dairy

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Excerpt from article on Water Usage and Treatment by Mikell Knights

The reuse of cow water for process line rinsing and flushing to achieve a significant
reduction in potable water consumption was a primary goal for AgriMark-Cabot Dairy in
Middlebury, VT. The Middlebury plant generates significant quantities of cow water as a
byproduct of its whey production, which amounts to approximately 2,000 tons of whey
protein concentrate and whey permeate daily.

Pasteurization of the cow water to the FDA Pasteurized Milk Ordinance requirements was
necessary for water reuse and to further Cabot’s sustainability goals, according to Doug
Yedwabnick, North American sales director for Atlantium, which provided a UV treatment
solution to meet the dairy’s needs.

Cabot installed Atlantium’s Hydro-Optic low-energy water disinfection system, an
alternative to more energy-intensive heat pasteurization approaches. The Atlantium RZ104
PMO inactivates spores and water-borne microorganisms with a medium pressure UV dose
(120 mJ/cm2) that achieves high log reduction.

“Heat pasteurization consumes 150kW per hour while the Atlantium technology uses just
3kW per hour to achieve the same level of treatment,” says Yedwabnick. The Hydro-Optic
models treat water continuously at flow rates ranging from 15 gpm to 4,000 gpm, so it can
deliver low energy usage with high rates of treatment. The water can be used for processes
such as final rinse, sanitation and saline solution dilution.

The unit can be installed downstream of a polishing RO device and is designed to kill
biological contaminants, not remove them like other water treatment approaches, explains
Yedwabnick. With the installation of the system, Cabot saw electricity consumption go
down by 158,000kW, CIP for tanks and allergens reduced by $13,000 and downtime costs
lowered to $19,200. Overall net savings of more than $71,000 have been realized since the
unit was installed in 2010.