Case study: Waste water was stored in a gas holding tank.
- Contents of Tank: Gasoline, Water, and Coal Tar
- Critical Contaminants: PNAs, BTEX, Oil, and Heavy Metals
- Discharge Limits: Benzene – 74 ppb, Zylene – 134 ppb
System Setup
- Oil/Water Separator
- Bag Filters
- 1 Absorber – 9,000 lbs. of OilSorb
- 2 Absorbers – 6,000 lbs. each of GAC
Wastewater Analysis Before and After Treatment
| Chemical | Influent Concentration (microgram/l) |
Effluent Concentration (microgram/l) |
|---|---|---|
| Benzene | 19,430 or less | 9.88 |
| Toluene | 8,835 or less | 3.93 |
| Ethyl Benzene | 1,560 or less | ND |
| Total Xylene | 7,130 or less | 9.23 |
Cost-Benefit Analysis: Hauling v. On-Site Treatment
Hauling ($0.45/gallon, 3 million gallons of water): $1,350,000
In-Situ Processing ($0.12/gallon, 3 million gallons of water): $336,000
Savings by using OilSorb: $990,000
