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City of Mansfield Waste Water Treatment Plant

Program objectives

  • Prevent industrial pollutant discharges from passing through municipal wastewater treatment plants untreated.
  • Protect treatment plants from the threat posed by untreated industrial wastewater\
  • To improve the quality of effluents and sludges
  • Educate industrial users of the affects of toxic pollutant discharges

Currently The City of Mansfield monitors seventy-four industries in the Mansfield and surrounding areas.

History

1902 The first ‘contact filter type’ sewage treatment plant was constructed by the City.
1918 An additional plant of the trickling filter type was  built to treat the sewage from the low level areas in Mansfield.
1936 Both plants were replaced by one new plant.
1939 A report was submitted to the City containing recommendations for collection and treatment of sewage that was not implemented due to the defense period, shortage of manpower, materials and the intervention of World War II.
1942 The small South Boulevards sewage plant was built.
1945 Due to equipment wearing out, increase of population and other factors, the City’s facilities for sewage treatment became inadequate.
1948 The City acquired the South Boulevards plant.
1953 Floyd G. Brown and Associates of Marion Ohio were retained as consulting engineers.  A review of the 1939 report was done and recommendations for improvements begin.
1960 The new four MGD waste treatment plant was completed.
1984 Plant improvements began and were completed in 1987.

Design Data

Average Design Flow 12 MGD
Peak Design Flow 25 MGD
Average BOD Loading 20,000 lbs/day
Average Suspended Solids 
Loading		 20,000 lbs/day
Average Ammonia Loading 2,000 lbs/day
Equalization Basin 4.9 million gallon capacity
Equalization Pumping  4 Screw pumps each @ 8.33 MGD
3 Screw pumps each @ 12.5 MGD
Bar Screens 2 Mechanical each  @ 25 MGD
1 Manual @ 25 MGD
Grit Removal 2 Aerated chambers with bucket elevators
Primary Clarifiers 2 Each @ 80’ x 80’ x 10’ Approx. 90 –  150 min’s detention time
Aeration Tanks 8 Each @ 222’ x 25’ x 15'
4.98 MGD total capacity
10 Hours average detention time
Aeration Blowers 4 Gas engine-driven each @ 6,500 cfm
2 Electric motor-driven each @ 5,000 cfm
Final Clarifiers 3 Each @ 100 ft. sq., 11 ft. deep
2.46  MG total capacity
Chlorination / Dechlorination 2 Chlorine contact tanks
Total volume of  0.26 MG
1 Chlorine gas feeder rated 
@ 500 lbs/day
1 Chlorine gas feeder rated 
@ 1,000 lbs/day
1 Chlorine gas feeder rated 
@ 2,000 lbs/day
2 Sulfer Dioxide gas feeders 
rated each @ 150 lbs/day
Effluent Pumping Station 4 Vertical turbine pumps each @ 8.0 MGD
Sludge Thickeners 2 Each @ 50’ diameter - 26,500 lbs./day of solids
Anaerobic Digestors  2 Primary each @ 148,000 cu. ft.
2 Secondary each @ 138,000 cu. ft.
Sludge Filter Presses 2 each @ 3,000 lbs/hr

 

Related Links

Laboratory
Maintenance
Sampling
Treatment Processes
Waste Water Crew