Van Gulik - Water Recycling and Wastewater Treatment System for Wastewater from Steel Powder Coating Process

The quantity of demineralised water required for the pre-treatment stage is approximately 2 m³ per hour. The deionised water is used for rinsing the parts that are to be coated once these have undergone degreasing, pickling and passivation. EnviroChemie was awarded the contract for constructing a combined water recycling and wastewater treatment plant. A tailored plant solution was subsequently installed for the customer in the form of the company’s Envochem ION and Split-O-Mat 3200 plant technology. The Envochem ION water recycling plant (consisting of a dual-layer filter, an activated carbon filter, plus two cation and two anion exchange units) is used to turn the circulating rinsing water into deionised water (< 15 µS/cm).

The used concentrate baths and return flows from the Envochem ION plant are collected separately and treated in the Split-O-Mat SOM 3200 wastewater treatment plant. The water containing chromium (VI) is first decontaminated before undergoing precipitation and flocculation. The resulting flocs then undergo sedimentation in a downstream sedimentation tank. The thin sludge is dewatered in a chamber filter press.

Performance data
Capacity of Envochem ION plant     2 m³/h
Capacity of Split-O-Mat plant     3m³/Tag
Content     Oil, Zn, Cr(VI), HF, H3PO4
Operating time     16 hours/day, 250 days/year