Case
Study 8-Albert Whitted Water Reclamation Facility
St. Petersburg, Florida
Wastewater Treatment |
|
|
|
Background Data: |
|
Case Study: Wastewater Treatment |
|
Location: Albert Whitted Water Reclamation Facility St.
Petersburg, Florida |
|
The Albert Whitted Water Reclamation Facility, located in St.
Petersburg, Florida, with a design flow of 12.4 MGD, treats an
average of 8.5 MGD of both industrial and domestic wastewater.
This anaerobic wastewater treatment facility has been generating
an average of 58.7 metric tons per week of sludge requiring proper
disposal. |
|
Sludge transport and disposal costs for the Albert Whitted Water
Reclamation Facility were consistently rising. The City of St.
Petersburg, Florida, decided to use PX-700TM as an additive to the
wastewater treatment process in order to offset the rising costs
associated with proper sludge disposal |
|
Scope: |
|
It was determined that the use of PX-700TM could reduce the
quantity of sludge generated at the Albert Whitted Water
Reclamation Facility, thus reducing overall sludge disposal costs.
|
|
PX-700TM, a microbial bio-catalyst, was to be used as an additive
at the St. Petersburg facility. |
|
The anticipated result from the use of PX-700TM was to be an
overall reduction of sludge generated by the Albert Whitted Water
Reclamation Facility, thereby reducing costs associated with
proper sludge disposal. |
|
Facility personnel were to gather pertinent data to analytically
determine the effectiveness of PX-700TM. Records were maintained
for volume of influent, amount of sludge generated, effluent
carbonatious biological oxygen demand (CBOD), and effluent total
suspended solids (TSS) |
|
Treatment Procedures: |
|
On June 28, 1998, PX-700TM was introduced into the digester at the
Albert Whitted Water Reclamation Facility. |
|
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.
|
|
118.8 ounces were injected on a flow proportional bases into the
digester during each 24 hour period, this converts into 0.11 mg/l.
This was less than half the normal dosage rate. |
|
It soon became evident that PX- 700TM was not working to its full
potential. The injection point and dosage amount were adjusted on
July 21, 1998. The injection point was relocated to the facility
headworks, and the dosage amount increased to 6.738 gallons per
day, this converts to. 79 mg/l. |
|
At the time of this writing, the dosage amount and location has
not changed. |
|
Results: |
|
The Monthly Summary Reports at the Albert Whitted Water
Reclamation Facility note a drastic change to both the amount of
sludge generated at the facility and the quality of the facility
effluent water. |
|
Facility records indicate that 58.7 metric tons of sludge was
generated and disposed of daily during the month of May 1998. This
compares to 49.5 metric tons of sludge generated daily during the
month of October 1998. Influent flow for these two periods was up
from 7.41 MGD to 8.40 MGD. This decrease in the amount of sludge
generated (on a flow proportional basis) represents a reduction of
over 25%. |
|
Facility records also indicate that during the same period, the
quality of the facility effluent improved. Total Suspended Solids
(TSS) were down to 0.71 mg/l from 1.21 mg/l and CBOD was down to
2.88 mg/l from 3.84 mg/l. |
|
It quickly became apparent to all involved, that the use of
PX-700TM not only significantly reduced the amount of sludge
generated by the St. Petersburg Wastewater Treatment Plant # 1,
but the quality of the plant emuent also improved. |
|
At the time of this writing, Tim Frogue, Chief Operator, has
indicated that the total value of PX- 700TM can not be measured.
Not only has the amount of sludge generated decreased, but the
quality of the facility's effluent has also increased. The
reduction in CBOD and TSS amount to a cleaner eflluent. |
|
Analytical Comparison: |
| All data used in this comparison
provided by Tim Frogue, Chief Operator, CityofSt. Petersburg,
Albert Whit ted Water Reclamation Facility. |
|
Parameter |
May 1998
|
October 1998
|
| |
|
|
|
Total Monthly Influent |
229.72 MG
|
260.61 MG
|
|
Total Amount of Sludge Disposed |
58.7 Metric Tons
|
49.5 Metric Tons
|
|
Average Eflluent CBOD |
3.84 mg/l
|
2.88 mg/l
|
|
Average Eflluent TSS |
1.21 mg/l
|
0.71 mg/l
|
|
|
Effiuent Quality |
| |
|
CBOD |
TSS |
|
Prior to Use of PX-700 |
|
3.84 |
1.21 |
|
With Use of PX-700 |
|
2.88 |
0.71 |
|
|
|
|
4.00 mg/l |
|
|
Effiuent TSS |
Effiuent CBOD |
|
|
|
|
|
|
|
Prior to Use |
After Use |
Prior to Use
|
After Use |
|
of PX- 700
|
of PX- 700
|
of PX- 700
|
of PX- 700
|
|
|
3.75 mg/l |
|
|
3.50 mg/l |
|
|
3.25 mg/l |
|
|
3.00 mg/l |
|
|
2.75 mg/l |
|
|
2.50 mg/l |
|
|
2.25 mg/l |
|
2.00 mg/l |
|
1.75 mg/l |
|
1.50 mg/l |
|
1.25 mg/l |
|
1.00 mg/l |
|
0.75 mg/l |
|
0.50 mg/l |
|
0.25 mg/l |
|
|
Total Cost of Sludge Generated |
|
Prior to Use of PX-700 |
|
58.7 Metric Tons Daily |
|
With Use of PX-700 |
|
49.5 Metric Tons Daily |
| |
|
|
With influent flow taken into consideration, this amounts
to a 25 % reduction in the amount of sludge generated. |
|
| |
|
|
|
70 Tons
|
|
|
Prior to Use of
PX- 700 |
With Use of PX-
700 |
|
|
60 Tons
|
|
|
50 Tons
|
|
|
40 Tons
|
|
|
30 Tons
|
|
|
20 Tons
|
|
|
10 Tons
|
|
| |
|
|
|
|
