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Columbia, MO -- Case Study : City of Grantsville, Utah
Problem Faced
The facility operated on a lagoon aeration treatment system consisting of three treatment ponds with surface aerators and six storage ponds without any aeration equipment. The existing aeration system only allowed effluent to be discharged during summer months due to permit requirements. The city desired a more efficient system that would allow a continuous discharge of treated effluent and have the capacity to meet future requirements for ammonia removal. To do so, the city would have to increase the treatment volume by either converting existing non-aerated ponds to aeration or construct new ponds that met state requirements.
The facility’s discharge permit required concentrations for BOD and TSS to be 30 mg/l or less, and to report ammonia concentrations in the final effluent. To design and upgrade the treatment plant’s capacity, the city contracted with Aqua Engineering Inc, located in Bountiful, Utah.
EDI’S Solution
Responding to the city of Grantsville’s wastewater treatment plant needs, Environmental Dynamics Inc. (EDI) proposed using the Atlas DBBR. Atlas DBBR is a lagoon-based extended aeration system that treats the raw wastewater using a batch reactor process. The technique provides continuous inflow of raw wastewater. It then undergoes a sequenced aeration reaction/mixing phase, followed by a settling phase. Finally, the water is decanted and discharged to treatment ponds. The effluent quality produced would meet the state requirements and allow continuous effluent discharge. It also creates nitrification that aids in the plant’s future ammonia removal needs.
“EDI’s hybrid extended aeration process allowed the plant to utilize their existing infrastructure to treat sewage without adding lagoon volume,” Darin Starr, EDI Sales Manager, said. “The plant is now able to run more efficiently while reducing extra costs.”
EDI Atlas DBBR system equipment was installed in treatment lagoon #1 after removing the existing surface aerators. Equipment required for the upgrade included EDI’s floating lateral aeration system with FlexAir 88S fine bubble diffuser assemblies, a BioReef Curtain, and four 24-inch diameter decant pipes with electric actuated valves, system control panel and three 220HP turbo blowers.
Source: http://www.wastewater.com/
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