Surface Treatment
Supplying static and current rinses, assembling new baths, washing filters and tanks — there are so many operations that generate water rich in pollutants carried away from the treatment baths.
Each step of surface treatment uses specific reagents:
- Passivation and finishing treatment: cyanide, fluorides, chromium VI, heavy metals, surfactants
- Pickling baths: waters with acidic or basic pH levels; rich in fluorides, phosphorus, and heavy metals
- Degreasing baths: water with basic pH levels, cyanide-laced, rich in heavy metals and hydrocarbons
Although the use of commercial products with less harmful environmental impacts is becoming more widespread, water from rinsings still contains pollutants, which are often very toxic and must be eliminated.
We treat this water before they’re discharged into the environment or at the municipal wastewater treatment plant:
Specific Cases
Construction of a zinc-loaded rainwater treatment plant:
- Physical and chemical treatment with coagulation and flocculation
- Lamella clarification or polishing using a sand filter
- Dewatering by a filter press
| Parameters | Input | Discharge |
| Zinc - mg/l | 800 | 2 |
| Flow rate - m3/hr | 15 |
Rainwater treatment solution:
- Flotation and sand filter treatment
- Activated carbon polishing treatment
| Parameters | Input | Discharge |
| COD - mg/l | 20 | 40 |
| SM - mg/l | 100 | 35 |
| Flow rate - m3/hr | 1,5 |
