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.
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:
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.