California City to Treat Nitrate in Groundwater Using Regenerable Ion Exchange

California City to Treat Nitrate in Groundwater Using Regenerable Ion Exchange

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The City of San Fernando, California, has awarded Envirogen Technologies, Inc. with a contract for a new, next generation SimPACK regenerable ion exchange (IX) treatment system to be used to remove nitrate contaminants from water from its Well 3 groundwater extraction well. As part of the award, Envirogen Technical Support staff will be onsite for assistance during installation and commissioning.

In addition to this new system, Envirogen was also selected to install an upgraded control package on Well 7A. The Well 7A SimPACK system, originally purchased in 2013 and installed by Envirogen, continues to be operated and maintained by Envirogen’s service staff. The control panel upgrade will bring new features and improved performance to ensure continued, reliable operation for years to come.

The new Well 3 treatment system was designed to handle higher levels of nitrate compared to the previously installed Well 7A system. Once installed and operational, the city intends to blend the combined water sources from Well 3 and Well 7A, treating the combined nitrate concentration using the two SimPACK systems (existing and new).

The new system consists of the following components:

• Pre-filtration using Envirogen FluxFlo bag filters and bag filter housings to remove suspended solids greater than 5 microns ;

• SimPACK regenerable IX unit inside an engineered container to shelter the system from weather and tampering; and

• Programmable Logic Controller featuring Envirogen SimPACK control logic to minimize waste rates and salt consumption.

The SimPACK system is a multi-bed design operated in a staggered mode process. The staggered bed is Envirogen’s N+3 method, allowing all but three of the vessels to be online while two vessels are being regenerated and one vessel is in standby. This design provides system redundancy, as required by the California Water Resources Board Division of Drinking Water, while producing a consistent effluent water quality that meets the target water quality requirements. Nitrate levels are monitored using an online nitrate analyzer that can measure alternately between the influent and effluent sample points. The process of transitioning vessels from online to regeneration to standby is completely controlled by the PLC provided.

In addition to the benefits of onsite regeneration, fully automated operations and system redundancy afforded by the SimPACK design, the City of San Fernando will also see low waste rates and energy requirements, long media life, and consistent water quality, according to Envirogen Technologies.

“We place enormous value on the role of Envirogen as a leading technology company in contaminated water treatment,” says Matthew Baumgardner, director of public works for the City of San Fernando. “Their technical knowledge and expertise in nitrate removal are proven to the City of San Fernando since 2013, when they delivered our first Envirogen SimPACK system to Well 7A.”

“Performance and reliability are the most crucial factor. The Envirogen service team has been collaborating with city staff on the oversight of our existing system for many years and providing an excellent service for their robust IX equipment. So, when the opportunity surfaced for the City of San Fernando to potentially implement a second nitrate removal system for the Well 3 groundwater extraction well, we were pleased to move forward with Envirogen’s next generation regenerable IX technology.”


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