An Arizona Aquifer Protection Permit (APP) is required for any facility that discharges pollutants to the groundwater. The two key requirements of APP are the ability to meet the Aquifer Water Quality Standards at the point of compliance, and to use the Best Available Demonstrated Control Technology. In the case of Camp Verde, they needed to achieve a Class A+ Reclaimed Water target.
As defined by the APP, that means that filtered effluent before disinfection complies with the 24-hour average turbidity criterion of < 2 NTUs and must not exceed 5 NTUs at any time. Additionally, before discharge to a reclaimed water distribution system, Class A+ reclaimed water samples can have no detectable fecal coliform organisms, the single sample maximum concentration of fecal coliform organisms is less than 23/100 ml, and concentration of total nitrogen must be < 10 mg/L.
After exploring various options to control turbidity and meet the intended Reuse permit for watering the new community park, Camp Verde’s engineers selected our infini-D™ Zero-Downtime Cloth Disk Filter to serve as tertiary treatment for achieving a Class A+ target.
The disk filter utilizes an outside-in flow: as influent passes through infini-D cloth media, suspended solids remain on the outside of the cloth, until the buildup of solids triggers a backwash cycle involving a vacuum head rotating around the face of the stationary disk.
One of the benefits to the infini-D is that each disks filtrate is visible discharging from the individual effluent valves. This feature allows operators to monitor each disk’s operation and quickly isolate a disk’s performance. Should a filter cloth need replacing, an individual disk effluent valve can be closed to facilitate disk removal without taking the entire filter cell off-line or draining the tank. Since the filter disks are stationary and do not rotate during backwashing, the infini-D eliminates the need for rotating seals, thereby preventing contamination of effluent in the event of a seal failure.
Construction started in October 2018. Engineers and staff at the WWTP in Camp Verde did most of the installation work, with guidance and input from our operations team. The system was designed to achieve a target of < 2 NTU turbidity, and the filter has an average rating at 900 GPM with 1500 GPM peak flow. The project also included the construction of a 24’ x 44’ steel building over the filter as well as a non-contact UV system, so that both the filters and UV system would be protected from the elements in a climate-controlled building.
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