32 MGD Wastewater Treatment Plant
Biological Nutrient Removal
SPRINGFIELD METROPOLITAN SANITARY DISTRICT, Illinois
The expansion of the Spring Creek Wastewater Treatment plant that broke ground in 2009 will result in modernized facilities that provide the capacity to meet regulatory requirements and consumer demand well into the future. The Springfield Metropolitan Sanitary District (SMSD) retained CMT to conduct facility planning, evaluate process alternatives and provide lead services for design, construction management and start-up for upgrading and expanding the Spring Creek plant from 20 MGD to 32 MGD.
The existing plant was initially constructed in 1928, with the latest major improvements made in the early 1970s. The $125 million plant will have a peak flow of 80 MGD with provisions for future expansion to 107 MGD peak flow. The proposed plant’s headworks are sized for 150 MGD to handle the anticipated additional 43 MGD of CSO volume. CMT is also leading the development of the district’s CSO Long Term Control Plan (LTCP).
The new WWTP includes biological nutrient removal (BNR) facilities designed to limit nitrogen and phosphorus discharges, and is one of the largest such facilities in the state of Illinois.
Other features of the plant include coarse screens, fine screens, grit removal, influent pumping, primary clarification, secondary clarification, UV disinfection, anaerobic digesters, sludge dewatering facilities and post aeration.
CMT is leading the systems integration design for what will be a fully-automated facility. Key features include a Computerized Maintenance Management System (CMMS) designed to integrate with the plant’s newsupervisory control and data acquisition (SCADA) system. Other technical features include a data and communications network, digital security, proximity cards and a VOIP telephone system.
One of the keys to the project’s ongoing success was the ability to acquire commitments upfront for all of the funding. In order to maximize the use of low-interest state revolving funds for the construction of the proposed improvements and to facilitate the use of local contractors, the construction is being completed in four phases over a four-year period. The plant is expected to be operational in the summer of 2012.