Case
Study 11-Lake Wilbar, City of Winter Park, Florida
Wastewater Treatment |
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Background Data: |
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Case Study: Wastewater Treatment |
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Location: Lake Wilbar, City of Winter Park, Florida |
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December 9. 1997 |
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Robert Young collects samples from Lake Wilbar for analysis.
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December 22. 1997 |
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Robert Young receives report from TOXKON on the phytoplankton
analysis of Lake Wilbar from samples collected on December 9,
1997. |
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Green Algae |
21.4 |
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Blue-Green Algae |
107.1 |
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Blue-Green Colonial Algae |
198.2 |
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Yellow-Green algae |
26.8 |
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Total
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353.6 cells/mI |
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Robert Young receives report from Envirodyne on the sample
analysis of Lake Wilbar from samples collected December 9, 1997. |
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Sludge Layer
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1
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2
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3
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4
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AS
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Percent Solids |
3.4 |
5.0 |
4.9 |
6.8 |
% WT |
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Total Volatile Solids |
12800 |
11100 |
12700 |
19900 |
mg/l |
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Total AJkalinity |
105 |
164 |
80 |
115 |
mg/kg |
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Total Kjeldahl Nitrogen |
324.0 |
484.0 |
475 |
778 |
mg/kg |
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Calcium |
1110 |
2760 |
8140 |
3690 |
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Magnesium |
262 |
172 |
473 |
209 |
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Potassium |
54.7 |
60.9 |
258 |
80.9 |
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Nitrogen, Total |
324.0 |
484.0 |
475.0 |
778.0 |
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Nitrate |
BDL |
BDL |
BDL |
BDL |
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Nitrite |
BDL |
BDL |
BDL |
BDL |
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Phosphorus, Total |
82.2 |
164.0 |
109.0 |
124.0 |
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Water Column |
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Calcium |
2.93 mg/l |
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Magnesium |
BDL |
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Potassium |
BDL |
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Total Kjeldahl Nitrogen |
0.34 mg/l |
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Phosphorous, Total |
BDL |
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Percent Solids |
0.1 % |
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Total Volatile Solids |
42.0 mg/l |
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Total Alkalinity |
7.0 mg/l |
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Total Nitrogen |
0.34 |
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Nitrate as Nitrogen |
BDL |
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Nitrite as Nitrogen |
BDL |
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Augyst 25, 1998 |
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Initial treatment schedule developed bv Bob Eckhart
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Day 1 |
40 ppm |
40 gallons |
17 gallons pumped from 2 injection points over 24 hours 2
pumps each dispensing 11.5 ounces in 15 minute intervals 23
gallons hand applied with spray applicator |
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Day 2 |
30 ppm |
30 gallons |
17 gallons pumped from 2 injection points over 24 hours 2
pumps each dispensing 11.5 ounces in 15 minute intervals 13
gallons hand applied with spray applicator |
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Day 3 |
20 ppm |
20 gallons |
17 gallons pumped from 2 injection points over 24 hours 2
pumps each dispensing 11.5 ounces in 15 minute intervals 3
gallons hand applied with spray applicator |
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Day 4 |
10 ppm |
10 gallons |
10 gallons pumped from 2 injection points over 24 hours 2
pumps each dispensing 11.5 ounces 56 times during a 24 hour
period |
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Day 5 |
5 ppm |
5 gallons |
5 gallons pumped from 2 injection points over 24 hours 2 pumps
each dispensing 3.3 ounces in 15 minute intervals |
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September 3, 1998 |
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Robert Young contacts Flowers Laboratories concerning analytical
sampling and testing for Lake Wilbar .It was decided that four
sampling events would be conducted at the beginning of the
project. Each event would consist of: |
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Muck Layer |
Water Column |
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Percent Solids |
Total Alkalinity |
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Total Volatile Solids |
Kjeldahl Nitrogen |
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Total Alkalinity |
Nitrate |
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Kjeldahl Nitrogen |
Phosphorous, Total |
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Nitrate |
Chemical Oxygen Demand |
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Phosphorous, Total |
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Chemical Oxygen Demand |
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September 4, 1998 |
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Robert Young completes measurement and calculation ofwater volume
of Lake Wilbar. |
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September 8, 1998 |
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2 muck samples collected |
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1 water sample collected |
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September 8, 1998 |
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Robert Young collects two water column samples from Lake Wilbar
for analysis of: |
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Total Kjeldahl Nitrogen |
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Total Phosphorous |
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September 11, 1998 |
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Robert Young provides Lake Wilbar measurements to Dr. Argo for
conformation of calculation of water volume. |
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September 16, 1998 |
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1 muck sample collected |
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September 16, 1998 |
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Robert Young
collects five sludge samples from Lake Wilbar for analysis of: |
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Total Kjeldahl Nitrogen |
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Total Phosphorous |
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September 18, 1998 |
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Treatment of Lake Wilbar begins. The five day initial treatment
schedule developed by Bob Eckhart is followed as outlined by him.
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Following the initial dosage, a total of 4 mg/l per day was
injected at two points, 2 mg/l each, and 10 gallons (10 mg/l) was
sprayed twice weekly. |
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October 2, 1998 |
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Flowers Laboratory reports results of September 8, 1998 sampling
event. |
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Water Column |
Sample 1 |
Sample 2 |
Expressed as |
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Total Kjeldahl Nitrogen |
2.34
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1.78 |
mg/l |
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Total Phosphorous |
<0.500 |
<0.500 |
mg/l |
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October 20,1998 |
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Application of PX-700TM ceases. |
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October 20,1998 |
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Flowers Laboratory reports results of September 8, 1998 sampling
event. |
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Sludge
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1
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2
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3
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4
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5
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AS
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Total Kjeldahl Nitrogen |
72.9 |
30.1 |
46.5 |
39.8 |
37.1 |
mg/kg |
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Total Phosphorous |
<0.1 |
<0.1 |
1.80 |
<0.1 |
<0.1 |
mg/kg |
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October 22,1998 |
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Frank Clark and Ralph Smith collect four water column and three
sludge samples from Lake Wilbar for analysis of: |
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Water Column |
Sludge |
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Total Suspended Solids |
Total Volatile Solids |
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Total Inorganic Solids |
% Solids |
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Total Kjeldahl Nitrogen |
Total Kjeldahl Nitrogen |
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Total Phosphorous |
Total Phosphorous |
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November 10, 1998 |
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Flowers Laboratory reports results of October 22, 1998 sampling
event. |
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Water Column |
1 |
2 |
3 |
4 |
AS |
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Total Suspended Solids |
3.00 |
<1.00 |
<1.00 |
2.0 |
mg/l |
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Total Inorganic Solids |
22.0 |
20.0 |
8.0 |
22.0 |
mg/l |
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Total Kjeldahl Nitrogen |
0.0173 |
0.2474 |
0.0110 |
0.0211 |
mg/l |
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Total Phosphorous |
0.326 |
0.493 |
0.740 |
0.574 |
mg/l |
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Sludge |
1 |
2 |
3 |
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AS |
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Total Volatile Solids |
15.5 |
32.0 |
52.3 |
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% WT |
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%Solids |
38.4 |
9.33 |
11.0 |
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%WT |
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Total Kjeldahl Nitrogen |
0.168 |
304.0 |
41.0 |
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mg/kg |
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Total Phosphorous |
8.18 |
5.42 |
1.91 |
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mg/kg |
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Final Results |
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Before and after sample analysis was not consistent. For the
parameters sampled both before and after treatment, all showed a
significant improvement. Average before and after results are as
follows: |
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Water Column |
Before Treatment |
After Treatment |
AS |
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Total KjeldahlNitrogen |
0.34 |
0.113 |
mI/l Lake |
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Sludge Layer |
Before Treatment |
After Treatment |
AS |
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% Solids |
5.03 |
19.58 |
%WT |
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Total Volatile Solids |
14125 mg/l (1.4% |
32.27 |
%WT |
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Total Kjeldahl Nitrogen |
515.25 |
115.06 |
mg/kg |
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Total Phosphorous |
119.8 |
5.17 |
mg/kg |
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Analytical Comment |
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Water column sample showed a significant reduction in Total
Kjeldahl Nitrogen. Sludge samples indicate a significant reduction
in Total Volatile Solids, Total Kjeldahl Nitrogen, and Total
Phosphorous. The large reduction in Total Volatile Solids was do
mainly to aeration. This would also account for the increase in %
Solids. |
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From
observation it is obvious that the Total Suspended Solids and
Turbidity of the water in Lake Wilbar has been greatly reduced. |
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