Drinking water for the 24,000 residents of Lafayette, Colorado, east of Boulder, is provided by the city’s 13 million gallons per day (MGD) surface water treatment plant.
In late 2000, the Lafayette plant staff decided to switch from using gaseous chlorine to sodium hypo chlorite (NaOCl) as the primary disinfectant for the water treatment system. They wanted to find an alternative to distributing NaOCl under pressure to avoid the potential for problems associated with leaks and chemical off-gassing in a pressurized system.
The gaseous chlorine feed system was replaced with a LVN-2000 Liquid Chemical Feed System from Siemens, equipped with additional rotameters for seasonal plant flow rate fluctuations. The old gas system was removed with the exception of the water injector piping, which was retained and modified for the new W&T injector. The design of the LVN-2000 system makes its installation much simpler than other chemical delivery systems and yielded several cost saving advantages for the Lafayette plant.
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