Municipal
Wastewater Treatment - with high Fats, Oils and Grease
Case Study
#1
Flow 2,000,000 / day average dry
weather flow, high peak loadings - Water retention time 8 hours.
Sludge retention time of 5-7 days.
Problem: Poor biological treatment
throughout the plant due to sludge carry over. High levels of grease and
fats.
Treatment: The recommended daily
dose was applied directly into every channel of the plant. See table
below.
Results: The following averages
were achieved after 6 months of treatment. The amount of oxygen required to run
the plant was reduced by 30%. There was a significant reduction in grease and
fats.
| |
BOD |
BOD |
COD |
COD |
| |
Influent |
Effluent |
Influent |
Effluent |
| Before Treatment |
460 |
95 |
580 |
135 |
| |
|
|
|
|
| Month 1 |
460 |
85 |
600 |
95 |
| Month 2 |
440 |
38 |
560 |
80 |
| Month 3 |
480 |
30 |
620 |
60 |
| Month 4 |
560 |
28 |
680 |
62 |
| 6 month average |
460 |
28 |
520 |
55 |
| With treatment |
|
|
|
|
| |
mg/L |
mg/L |
mg/L |
mg/L |
Wastewater Treatment -
Hydrocarbon Impacted System
Case Study
#2
Flow: 1,000,000 GPD average
Problem: County surcharges for
excess COD and TSS. VOC's are offensive to adjacent neighbors.
Previous Treatment: Use of polymers
injected at the headworks.
Petro-Clear Treatment: Initial
shock - Three (3) 55 gallons drums of Petro-Clear IC
Week 1 - 22 GPD of Petro-Clear IC
Weeks 2 - 6 - 6 GPD of Petro-Clear
IC Results: The following averages were achieved after 30 days of treatment.
| |
|
Before |
11 Days |
30 Days |
|
|
|
|
|
| COD |
mg/L |
2130 |
289 |
212 |
| TSS |
mg/L |
140 |
30 |
25 |
| Benzene |
mg/L |
700 |
580 |
540 |
| Toluene |
mg/L |
480 |
370 |
290 |
| Ethylbenzene |
mg/L |
34 |
9.2 |
6.8 |
| Xylene Isomers |
mg/L |
232 |
213 |
196 |
| FOG |
mg/L |
72 |
12 |
10 |
| Sludge reduction |
est |
- |
75% |
75% |
| VOC odors |
ppm |
20-60 |
0 |
0 |
| Lagoon Quality |
|
Murky |
Clearing |
Clear |
