Wastewater Treatment

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Wastewater is defined as water that has been used for domestic or industrial purposes.  Wastewater treatment includes physical, chemical, and biological processes to remove pollutants from wastewater before discharging it into a water body.  Treating the wastewater and returning it to the river is done at a wastewater treatment plant.  The process of separating the waste from the wastewater is complex, difficult, and also very interesting.

Wastewater treatment staff are responsible for the operation and maintenance of multiple facilities.

The Bull Creek plant was originally constructed in 1958 and, through the years, two expansion projects brought the plant to a treatment capacity of .9 million gallons per day (MGD).   In 2000, the City of Gardner had to purchase and install a package waste treatment plant to keep up with the rapid population growth.  The package plant capacity was .3MGD and utilized aerobic digestion and UV disinfection as its treatment process. 

The Kill Creek Water Resource Recovery Plant was constructed in 2002 and is capable of treating 2.5 MGD, with a peak treatment capacity of 7.5 MGD.  To accommodate future growth, the facility was modularized so that it can be expanded from the current capacity of 2.5 MGD to 7.5 MGD.  It has already been plumbed for additional treatment trains allowing the facility to be expanded in the future without disrupting operations.

The Bull Creek Treatment Plant and the Interim Package Plant were taken offline in 2008.  With the expansion of the Kill Creek Water Resource Recovery Plant, improvements to the South Lift Station, and conversion of the old Bull Creek plant to a lift station, the Kill Creek Plant now has the capacity to serve all aspects of the City's wastewater needs.

There are currently 17 lift stations within the collection system, which pump sewage to the Kill Creek Water Resource Recovery Plant.  City staff continually monitor and regulate the pump stations through inspections, preventative maintenance, and repairs.  These stations are also monitored remotely with the use of modems and computers, allowing operators to respond to alarm conditions whenever they occur.