Dynamically adjusting operations according to the pollutant load The upgrades at the plant enabled huge energy savings of 20 percent, or 640,000 kWh a year, compared to the previous system. Much of the energy reduction was achieved by the new ability to dynamically adjust operations according to the pollutant load to be removed. This flexibility is critical since discharge from local textile businesses can lead to highly variable nitrogen peaks loads. The improvement of the wastewater treatment plant helped Lariana Depur to enhance the water quality of
the Seveso River, and consequently, meet the stringent discharge directives regulating the Lake Como area. The upgrade helps the plant to drastically reduce the risk of exceeding the limit of nitrogen concentrations in its discharge (15 mg/l). At the same time, the integrated solution lowers the plant’s energy footprint to make the community more sustainable.
The plant's new PLC-based control system was developed by Lariana Depur with help from Xylem. The system receives process data from Xylem WTW sensors, for dissolved oxygen and nitrogen, and enables the plant to know when to add more air or less air, or no air at all, in which case the adaptive mixers are started to avoid sedimentation in the tank.
"This upgrade sets a new standard for wastewater treatment in industrial zones, particularly those where there is textile manufacturing," says Marco Leoncavallo, Customer Excellence Manager, Xylem Water Solutions Italia. “We are proud to partner with Lariana Depur in helping to preserve local water resources.” Xylem, email@example.com, www.xylem.com
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