Groundwater purification system for chromate removal
Location:
Milan
Build time:
Since 09/2024
Client:
Land redevelopment companies / real estate companies
Groundwater purification system for chromate removal
The water treatment plant converts chromium (VI) into the harmless trivalent form by adding a reducing agent.
Chromium (VI) concentrations above the permissible limits were detected in the groundwater of a former tannery in a historic industrial area of Milan. For treatment, ZÜBLIN Umwelttechnik installed a water treatment plant in September 2024 that converts chromium from the hexavalent to the trivalent form by adding an iron-based reducing agent. To increase the reaction rate, the pH value of the water is adjusted slightly below the neutral point. The excess iron is then oxidized and filtered out before the purified water is discharged.
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Scope of services
- Conception and delivery of the plant technology, chemical delivery
- Reduction with FeSO4 (20 %)
- pH control with H2SO4 (20 %)
- Oxidation with microbubbles and Na(OH) (30 %)
- Maintenance, data logging, remote access