Wastewater collection and treatment plant updated with PLCs, SCADA

Problem

The city of Faribault, Minnesota, needed to modernize its wastewater collection system and treatment plant. The project included a major upgrade to all electrical components, including PLCs and SCADA system programming.

Solution

PRIMEX worked with the electrical contractor on engineering and commissioning the upgrades. A thin client architecture provides scalability and management. Critical upgrades included seven PLCs, motor control centers on a DeviceNet bus, 28 separately enclosed VFD controllers, and the Wonderware System Platform deployed inside the plant on virtualized server hardware. Virtualization allows the city to replace hardware rather than upgrading SCADA software licenses, saving money. As part of complete integration, PRIMEX handled system documentation, including a comprehensive description of operation, application programming and overall system responsibility.

Result: 

The Wonderware platform deployed across the entire plant includes redundant links that make sure all communications operate as desired. 844-477-4639; www.primexcontrols.com

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Customized solution to treat varying water quality

Problem

The city of Lexington, Illinois, needed a new water treatment plant as residents were seeing tinted drinking water caused by organic compounds. Water is sourced from multiple wells, creating complexity due to the unstable water quality.

Solution

Tonka Water, a Kurita America Brand, provided a customized solution for removal of TOC, iron, manganese and hardness. It included forced draft aeration, pressure filtration, detention and ion exchange, as well as full plant controls. The system provides four treatment processes under one manufacturer’s responsibility. The process begins with aeration for iron oxidation. Water then flows to detention, allowing time for the iron to oxidize. Next, water flows through an OptaCell Plus pressure filter for iron and manganese removal. The filter has isolated cell compartments above and below the underdrain, allowing individual cells to be backwashed or taken offline while the others remain in service. Each cell includes the Simul-Wash backwash system, reducing backwash waste and providing cost savings. In the next stage the water flows through four RidION ion-exchange softener vessels, followed by an Organix system for TOC removal.

Result:

The plant has met expectations since commissioning. 866-663-7633; www.kuritaamerica.co