Program Objectives
- Prevent industrial pollutant discharges from passing throughout municipal wastewater treatment plant untreated.
- Protect treatment plant from the threat posed by untreated industrial wastewater
- To improve the quality of effluent and sludge
- Educate industrial users on the effects of toxic pollutant discharges
Currently, The City of Mansfield monitors nineteen industries in 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 the 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, an increase in 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 to increase treatment flow 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 | 4 Each @ 100 ft. sq., 11 ft. deep 2.46 MG total capacity |
| Chlorination / Dechlorination | 2 Chlorine contact tanks Total volume of 0.26 MG 2 Chlorine gas feeder rated @ 500 lbs/day 1 Chlorine gas feeder rated @ 2,000 lbs/day 2 Sulfer Dioxide gas feeders rated each @ 250 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. |
| Dewatering Centrifuge | 2 each @ 2,060 lbs/hr |
contact
Wastewater Treatment Plant
Telephone: 419-589-2830
Fax: 419-589-7984
Email: rcoker@ci.mansfield.oh.us