Before governments began monitoring wastewater discharges and long before it was favorite to be "green" in your process, a Swedish firm named Wirsbo partnered with a Minnesota based water medicine firm to solve both a process wastewater question and fabricate a ideas to reuse the process water.
Wirsbo, founded in 1694 in Sweden is most predominant for its world leading in floor radiant heat tubing.
Wirsbo commerce its tubing through a robotic extrusion process, cooling the tubing in water troughs fed 24/7 by the robots. Because of the high temperature, and the open air trough, the cooling water in the trough was black and oily, with a burning odor. The trough itself had string algae 1-2" thick on the sides. Minnesota Water medicine arrived with ionization and oxygenation technology in 1996 to fabricate and fabricate a chemical free system.
Wirsbo has a 50 year warranty on their tubing, the use of chlorine or other chemicals degrade the life of their product. Tests after cooling, in chemically treated water were employed and were the same. Chemicals were not an option!
Minnesota Water medicine not only solved the "black water" cooling trough issue, a recirculation strategy was finally advanced allowing water to recirculate through 60 ton Evapco cooling towers and chiller bundles in later years.
"In increasing to the extreme black water on install, it was thought about that fusaria and nematode infestations to the cooling trough water existed as loading dock doors allowed these tasteless spores to enter the open trough water on each robotic process line."
Wirsbo implemented programmable controllers and an ionization test on every shift to preclude recurrence of the microbes.
Glass media was implemented in 2006 at flow rates of 60 Gpm to 400 Gpm to additional lower microns of filtration and maintenance cost. Filtration has evolved from bag to De, De to Zeolite, Zeolite to Glass over the 13 year site history, with Glass media extending both media life and reducing backwash by 50%. The glass media is used in Pentair Ta 60, Ta 100 and Tr 140 low pressure, high flow rate sand filters with high flow rate valves. Two years without re-bedding is now historical.
The use of Asahi differential pressure valves has allowed a headered bank of filters to automatically shift filters for backwashing at the convenience of on-site personnel. Previous bag filter systems did not permit the recirculation and rinse of the water and would shut down flow in the troughs requiring cleaning or turn out to continue manufacturing tubing.
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