EnviroChemie GmbH

A Quick Solution: Modular Wastewater Treatment - Case Study

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Courtesy of EnviroChemie GmbH

Rust corrodes materials and may lead to impurities. As a result, there is a demand across most sectors for components that are protected against corrosion. Cantin SA, headquartered in Domdidier in Switzerland, specializes in the metalworking of rust-proof materials. The company produces complete products and individual components for many different sectors, from medical technology through the food industry to electrical engineering.

The first step of the production process involves the experts at Cantin mechanically and thermally moulding the individual components. When welding is required as part of the process, residue which is susceptible to corrosion is frequently left on the surface. The processed components therefore undergo after-treatment and cleaning where they are pickled in an immersion basin containing acid or – if they are too large for this – they are treated with a pickling spray containing adhesion gel. This results in consistently rust-proof surfaces, however it produces contaminated wastewater. 'As a result of the pickling process, the water ends up containing acid and heavy metals, among other things, which means we need to treat it before we can release it into the sewer system', explained Christian Guinnard, technical director at Cantin SA.

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