The City of Marysville Wastewater System serves the residents and businesses in the City as well as Milford Center, the Honda of America auto and motorcycle plants, and Union County along Industrial Parkway.  The current facility treats an average daily flow of approximately 4.0 million gallons per day (mgd).  The Wastewater Treatment Plant (WWTP) is located on the north side of Marysville at 620 North Main Street.  The WWTP is staffed seven days a week, 24 hours per day.  The Wastewater Superintendent, Rick Varner, can be reached at (937) 642-1036 weekdays from 8:00am to 4:30pm.

History

The original sewers in Marysville were installed in 1913.  At that time the system was comprised of about 13 miles of six or eight inch clay gravity lines and a small pond.  In 1932 the first anaerobic digester was built as well as Imhoff tanks and the treatment pond was enlarged.  In the fifties, two aeration tanks with agitating aerators were added as well as final clarifiers and sludge drying beds.

1964 brought the first large expansion with the addition of another larger primary anaerobic digester, conversion of the Imhoff tanks to primary clarifiers, grit removal system, one additional aeration tank, a blower building and blowers to provide aeration, an additional final clarifier, and disinfection facilities.

In 1982 construction began on the existing treatment plant.  The facility is a two-stage activated sludge plant with tertiary filters.  The facility included pretreatment, primary clarifiers, additional aeration tanks, intermediate clarifiers, second stage aeration tanks and blower building, final clarifiers, effluent pumping, tertiary sand filters, chlorine and chemical feed systems, an equalization basin, administration building with a laboratory, a secondary anaerobic digester, and new sludge drying beds.  This expansion brought the total design capacity to 2.3 mgd.

In 1989 work began on a 1.7 mgd Orbal oxidation ditch and an additional final clarifier.  This expansion was added as a second flow train and runs parallel with the old plant.  A small pump station was also built to split the flow before pretreatment with approximately 58% of the flow directed to the existing 2-stage facility and 42% to the Orbal facility.  This brought the total design capacity to 4.0 mgd.

Two belt filter presses were installed in 1995 to dewater digested solids.  The first anaerobic digester built in the 1930's was converted to a lime holding tank to store used lime from the City Water Treatment Plant to be dewatered along with wastewater biosolids.

In 2000, a new headworks building with influent pumps, grit removal, fine screens, and flow diversion structure was constructed.  This facility replaced the pretreatment building constructed in the early 1980's.

In 2003, the anaerobic digester was converted to an aerobic digester.  The digester was modified and placed in operation in 2005.

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Collection System

The current sewer system is made up of approximately 89 miles of sewer lines.  This includes both gravity and force mains.  The sewers range from 6 to 36 inches in diameter.  The system also includes 14 lift stations and 2,065 manholes.

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New Facilities

In 2004, the City completed its Wastewater Master Plan.  From the results of this study, design of the new Water Reclamation Facility (WRF), to replace and expand the capacity of the existing facility began in 2005.  The new WRF will be located southeast of the City.  The new expanded Marysville Water Reclamation Facility is planned for "start-up" in late 2008.

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Personnel

The current Division of Wastewater is comprised of the following:

●Superintendent - Ohio EPA Class IV Operator's Certificate
●Chief Operator - Ohio EPA Class III Operator's Certificate
●Five Operators - OEPA Certified Operator's (Class III, II, and I)
●Lab Technician - Ohio EPA Class III Operator's Certificate, Class I Lab Analyst Certificate
●Two Maintenance Mechanics
●Collection System Crew Chief - Ohio EPA Class II Wastewater Collection
●Four Collection System Maintenance Crew Workers - OEPA Collection Systems Certified (Class II-I)
●Administrative Assistant