The concentrates produced by the processing can be multiples come from the exhaustion of baths and static washings that tend to concentrate and lose their function.
We can divide them into these types:
- Cyanurate concentrates
- Chromic concentrates
- Saturated or exhausted acid concentrates
- Saturated or exhausted alkaline concentrates
- Eluates regeneration from ion exchange resin systems
- Exhausted degreasing
- Exhausted pickling
Cyanurate concentrates and chromic concentrates contain respectively cyanides and hexavalent chromium. They must be treated with chemical contrast reagents before being dosed in the chemical-physical purification system or water treatment.
Alkaline and acid concentrates can be dosed directly in the water treatment plant in stoichiometric form.
The resin regeneration eluates have a high salinity and all the substances previously retained by the resins, these concentrates must also be dosed automatically and in relation to the treatment volume.
Even if they are alkaline, it is preferable to treat them beforehand with absorbent coagulants or with Fenton reactions, it is always preferable to carry out a cost-benefit evaluation and make an economic comparison to verify the cost of direct disposal or the dosage in the chemical-physical water treatment plant.
The dosing of concentrates must have a single recipe for each of the products, this allows the optimization of dosing, alignment and compliance of the wastewater discharge parameters of the treatment plant.
