Case Study

Expanding Capacity while Conserving Space, Energy And Chemical Use – Springfield, IL MSD

Expanding Capacity while Conserving Space, Energy And Chemical Use – Springfield, IL MSD

Challenge
​Springfield, Illinois Metro Sanitary District needed to expand the capacity of its Spring Creek Wastewater Treatment Plant to handle stormwater events. Additional goals included conserving space, energy and chemical use.

Solution
For biological nutrient removal (BNR), Springfield MSD's engineering firm recommended the Evoqua VLR (vertical loop reactor) System​ for Biological Treatment. The VLR System uses an aerobic anoxic reactor process, unique to Evoqua, to achieve BNR through simultaneous nitrification/denitrification. Advantages include:

  • Reduces ammonia and phosphorus to very low levels without the need for chemicals
  • Reduces the need for aeration, saving energy
  • Smaller footprint than traditional BNR systems
  • Reactor balancing options that provide superior stormwater management
  • Evoqua's SmartBNR™ control system automates significant parts of the operation​

Results
The expansion increases the plant's treatment capacity from 20 MGD to 32 MGD, with peak capacity up to 80 MGD. Effluent quality is well within significant limits and stormwater events have been handled well within the new system’s capacity. The system is meeting energy conservation goals and tight new ammonia, nitrogen and phosphorus limits with minimal chemical treatment.​​

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