Case
Study 6-UNIVERSITY SHORES-Orlando, Florida
Wastewater Treatment
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Background Data: |
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Case Study: Wastewater Treatment |
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Location: University Shores Wastewater Treatment Facility Orlando,
Florida |
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The University Shores Wastewater Treatment Facility, with a design
flow of 2 MGD, treats an average of 1.2 MGD of both industrial and
domestic wastewater. Infiltration is a major concern to City
personnel. Flow amounts increase by over 10% during rainy periods.
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This aerobic wastewater treatment facility has been generating an
average of 66.185 tons per month of sludge. The abnormally high
quantity of sludge generated can be attributed to the facility' s
groundwater infiltration problem. |
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Sludge disposal costs for the University Shores Wastewater
Treatment Facility were above $100,000.00 per year. This figure
does not take man hours, sludge press maintenance, or polymer
usage into account. According to Bill Pyle, Wastewater
Superintendent, the true sludge disposal costs may be over
$250,000.00 per year. |
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Scope: |
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It was determined that the use of PX- 700TM could reduce the
quantity of sludge generated at the University Shores Wastewater
Treatment Facility, thus reducing overall sludge disposal costs.
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PX- 700TM, a microbial bio-catalyst, was to be used as an additive
at the University Shores Wastewater Treatment Facility. The
anticipated result from the use of PX-700TM was an overall
reduction of sludge generated by the University Shores Wastewater
Treatment Facility; thereby reducing costs associated with sludge
disposal. |
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Facility personnel were to gather pertinent data to analytically
determine the effectiveness of PX- 700TM. Records were maintained
for Mixed Liquor Suspended Solids (MLSS), Mixed Liquor Volatile
Suspended Solids (MLVSS), Waste Activated Sludge (WAS), Fecal
Coliform, Tons of Sludge Generated, Man Hours to Press and Dispose
of Sludge, Amount ofPolymer Used, Sludge Transport and Disposal
Charges. |
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Treatment Procedures: |
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On April 8, 1998, PX-700TM was introduced into the aerobic
digester at the University Shores Wastewater Treatment Facility. |
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Since the only objective was to eliminate the amount of sludge
generated, and thereby reduce the cost associated with sludge
disposal, the digester was chosen as the injection point
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39.6 ounces were injected on a flow proportional bases into the
digester during each 24 hour period, this converts into 0.25 mg/1.
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The dosage amount and location have been slightly modified by
facility personnel on several occasIons. |
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Results: |
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The Operators Log at the University Shores Wastewater Treatment
Facility noted a drastic change in both the facility settling time
and turbidity during the first 24 hours of use. Due to the quicker
settling time and clearer water, it was determined by facility
personnel to reduce the amount of polymer introduced into the
treatment works. |
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Facility records indicate that 30.00 tons of sludge was generated
and disposed of during the first month ofuse. This compares to
66.185 tons of sludge generated previously during the same flow,
weather, and operational conditions. This decrease in the amount
of sludge generated represents a reduction of over 54%.
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Facility records also indicate that during the first 30 days ofuse,
the amount of polymer used as a part of the treatment process
declined as well as the man hours associated with the proper
handling, transport, and disposal of the generated sludge.
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It quickly became apparent to all involved that the use of
PX-700TM significantly reduced the amount of sludge generated by
the University Shores Wastewater Treatment Facility. |
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Facility personnel decided to permanently keep PX-700TM on line. |
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Since that time, Bill Pyle, Wastewater Superintendent has
indicated that the total cost for sludge disposal at the
University Shores Wastewater Treatment Facility is down 60%. |
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The University Shores Wastewater Treatment Facility has continued
to purchase and use PX- 700TM through the date of this writing. |
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Total Cost of Sludge Transport and Disposal |
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Prior to Use of PX-700 |
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$135,000.00 Annually |
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With Use of PX-700 |
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$54,000.00 Annually |
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This amounts to a 60% reduction in the total annual cost
of transport and disposal of sludge. |
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$175,000.00
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Prior to Use of
PX- 700 |
With Use of PX-
700 |
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$150,000.00
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$125,000.00
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$100,000.00
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$75,000.00
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$50,000.00
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$25,000.00
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Total Cost of Sludge Generated |
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Prior to Use of PX-700 |
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66.185 Tons Montly |
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With Use of PX-700 |
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30 Tons Montly |
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This amounts to a 54% reduction in the total amount of
sludge generated |
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70 Tons
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Prior to Use of
PX- 700 |
With Use of PX-
700 |
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60 Tons
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50 Tons
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40 Tons
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30 Tons
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20 Tons
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10 Tons
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