Spring Creek Wastewater Treatment Plant (WWTP), Illinois, United States of America

Springfield in Illinois, US

Spring Creek wastewater treatment plant is located about one mile east of the 26th Ward WWTP at Springfield in Illinois, US. The plant's expansion began in 2009 and is expected to be completed by May 2014. It is expected to cost $125m.

The expansion will increase the plant's treatment capacity to 32 million gallons in a day (MGD) from the existing 20MGD. The new expanded plant is expected to serve about 145,000 residents in Sangamon County.

It will also include provision for future expansions of up to 80MGD to 107MGD at peak flow.

History of Spring Creek WWTP

"The expansion will increase the plant's treatment capacity to 32 million gallons a day (MGD) from the existing 20MGD."

The Spring Creek WWTP's construction began in 1926 and was completed in 1928. It was put into operation in 1929. In 2005, the Illinois Environmental Protection Agency (IEPA) declared that the wastewater treatment plant at Spring Creek was hydraulically and biologically overloaded.

Many expansions and renovations were completed at the plant between 1928 and 2008 but could not meet the increasing demand for treated water in the region.

A new plant construction was proposed to replace the existing Spring Creek plant. The design for the four-phased construction of the new plant began in 2007. In December 2008, SMSD approved $95m worth of bonds for the construction of first two phases of the wastewater treatment plant at Spring Creek. The funding for the project came from IEPA's state revolving loan and federal stimulus money.

Expansion of the wastewater treatment plant

The first phase of construction at the Spring Creek plant included the construction of a diversion structure, an influent sewer and an administration and operations building. It also included construction of disinfection building and an out fall sewer and cascade aerator.

"The new expanded plant is expected to serve about 145,000 residents in Sangamon County."

The second phase involved construction of headworks, site utilities, activated sludge structure, building and equipment. The first and second phases of construction began in August 2009.

The third phase included construction of ten clarifiers measuring 140 inches and 20,000 yards of concrete. Following the completion of first three phases in July 2012 the new plant began operations at the north site with the transfer of about four million gallons of activated sludge from the old plant.

The fourth phase of construction, which began in 2011, is expected to be completed by May 2014. It includes construction of new dewatering building and equipment, new boiler building, anaerobic digester cover replacement and anaerobic digester piping modifications. It also includes construction of a new vehicle maintenance building, new thickening building and equipment, new sludge storage tanks and modifications to existing sludge facilities.

Facilities at the new Spring Creek WWTP

The new plant will include biological nutrient removal (BNR) facilities, which are designed to limit nitrogen and phosphorus discharges. It will also feature coarse screens, fine screens, grit removal and influent pumping.

It will have primary as well as secondary clarifications and other treatment facilities for sludge dewatering and UV disinfection. It will also have anaerobic digesters and post aeration facilities.

SCADA technology

The plant is designed to be fully automatic. A Computerised Maintenance Management System (CMMS) will integrate the plant through the supervisory control and data acquisition (SCADA) system. The plant will be equipped with data and communications network. It will also have a VoIP telephone, proximity cards and digital security.

Contractors involved with Springfield's project

The Springfield Metro Sanitary District (SMSD) is the owner of the Spring Creek wastewater treatment plant.

Crawford, Murphy and Tilly (CMT) consulting engineers were awarded with the civil and site work design and construction administration assistance services for project. CMT is also acting as the programme manager, providing project oversight, planning, design and construction management services.

Construction contracts for the first and second phases were awarded to River City Construction. The third phase was awarded to Plocher Construction. The contract for the fourth phase was awarded to William Brothers Construction (WBCI).

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