Discharge Compliance
Designed and implemented a wastewater treatment process to ensure that the unique environmental restrictions placed by the local POTW were achieved.
CORCAT W95L / CORCAT W85L
The Challenge
The customer applied for a wastewater discharge permit for a new cathodic electrocoat paint line. The water effluent from this new operation falls under the Federal EPA Metal Finishing Effluent Guidelines, 40 CFR Part 433. In addition to the Federal EPA Finishing Effluent Guidelines, the local POTW placed additional restrictions in the wastewater permit which created unique challenges in designing a chemical wastewater treatment program. The local POTW restrictions included surcharges for total phosphorus discharge over 10 mg/L and a permit violation for over 57 mg/L of total phosphorus discharge. In addition, the daily maximum limit of chloride in the permit was 1600 mg/L making the selection of the correct coagulant challenging.
The Solution
Alliant Chemical designed a chemical treatment process to meet these unique restrictions, that would use a unique sodium aluminate-based coagulant, CORCAT W95L. In combination with CORCAT W85L coagulant, the combination of both coagulants would create a wastewater treatment process that would meet these unique restrictions and be robust enough to handle variations in the incoming influent.
The Product
CORCAT W95L is specifically formulated to condition water containing metals and high levels of phosphates for easy flocculation and to eliminate the use of lime or other materials used as a source of calcium. CORCAT W85L is a concentrated mixture formulated to condition the water for the removal of phosphates and fluorides.
The Benefits
The local POTW completed an independent compliance sampling of the outfall (discharge) from this process. The results from the chemical wastewater treatment process are compliant with the discharge requirements in the discharge permit. There are no violations or surcharge issues from this wastewater treatment process.
Discharge Limit Results
- Nickel result 0.079 mg/L (limit 1.43 mg/L)
- Zinc result 0.19 mg/L (limit 1.48 mg/L)
- Total Phosphorus result 0.94 mg/L (limit 57 mg/L) (surcharge 10 mg/L)
- Chloride result 112 mg/L (limit 1600 mg/L)
Sustainable Chemistry