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WE ARE LOCATED AT 961 NORTH WATER STREET, TIFFIN,
OHIO OUR HOURS ARE 7:00 A.M.
TO 3:00 P.M.
Located
at 961 North Water Street
in Tiffin, the city’s wastewater treatment
plant, also know as the Water Pollution Control Center (WPCC) treats
industrial and domestic waste from Tiffin and
other areas in Seneca
County which share the
city’s sanitary sewer system.
In 1936
the city sewers poured raw sewage into the Sandusky River.
A primary treatment plant and intercepting sewers were recommended but not
built until 1955-56, designed by Jones and Henry Engineers of Toledo.
Construction began in 1955 and was completed in December 1956. Although
this project helped with river pollution, it was not adequate. In 1964
Floyd G. Browne and Associates studied the problem and recommended the
addition of secondary treatment and sludge filtration. Construction
began in June 1967 and was completed in June of 1969. It was designed
for an estimated Tiffin
population of 40,000 people in 1990.
The current design treatment flow
for the WPCC is 4.0 million gallons per day. The WPCC discharges its
effluent to the Sandusky
River. The plant
must maintain a minimum of 5.0 milligrams per liter (mg/l) concentration of
oxygen in its discharge. Total phosphorus concentrations must not
exceed 1.0 mg/l per month or a weekly average of 1.5 mg/l. The monthly
average limit for nitrogen ammonia in winter (November through April) is 12.9
mg/l while during the summer months (May through October) the monthly average
limit is 1.5 mg/l. The oil and grease limit year round is 10 mg/l.
The WPCC also monitors for
suspended solids, carbonaceous biochemical oxygen demand, certain trace
metals, fecal coliform, pH, and fecal coliform and chlorine residual (summer
only). By monitoring the sewage entering our treatment plant and what
is discharged to the Sandusky River we can calculate treatment efficiencies and
maintain compliance within Ohio
and U.S. EPA limits.
Solids
removed during the treatment process are broken down chemically and
biologically in anaerobic digesters, releasing gases (mostly methane) and
ammonia and phosphorus-rich liquid (supernatant). The treated sludge
which remains, known as biosolids, is safely applied to Ohio EPA-approved
local farmland as Class B biosolids.
Tiffin also maintains an industrial pretreatment program.
The pretreatment technician, under the direction of the pretreatment
coordinator, samples and inspects industries and their waste to maintain
compliance with the city’s sewer use ordinance. A limit on pH from 5.0
to 11.5 standard units exists on industrial discharges.
Surcharges may be imposed on high
strength wastewater from industries utilizing the following charges for those
located inside the city:
CBOD (carbonaceous biochemical oxygen
demand) (five-day) - $0.227 (22.7 cents) per pound in excess over 250 mg/l.
SS (suspended solids) - $0.178 (17.8 cents) per pound in excess over 250
mg/l.
COD (chemical oxygen demand) - $0.069 (6.9 cents) per pound in excess
over 450 mg/l.
NH3-N (nitrogen ammonia) - $2.69 per pound in excess over 20 mg/l.
P (phosphorus) - $1.44 per pound of excess over 25 mg/l.
Rates for outside of city users
are billed at one and one-half time (1.5X) the rates listed above.
For more information you may
contact Superintendent Dan McElhatten at (419) 448-5440 or e-mail at
watertreatment@tiffinohio.gov. You may also visit the EPA pretreatment
website at http://www.epa.state.oh.us/dsw/pretreatment/pretreat.html.
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