The lower availability of the resource and the tightening of regulations on discharges both in quantitative and qualitative terms constitute the main factors that are orienting business lines which consume water towards recycling.

This choice impacts widely on the architecture of the treatment solutions to be implemented. In this case, the main theme is not the regulations on discharges, but the water quality required for its reuse in the process it comes from or for any other use which allows enables the taking of fresh water to be limited indirectly.

The most advanced stage, namely zero liquid discharges on-site, more often than not calls on a combination of technologies, such as membrane separation, ion exchange, physical and chemical treatment, and evaporative concentration.

Beyond the economic and environmental considerations, this approach provides a source of improvements in terms of various aspects:

  • Freeing from regulatory pressure.
  • Improvement of production quality compared to using raw water, as is still observed with a good many business lines.



Industry concerned
A company specialising in the repair and maintenance of aircraft engine parts

Execution of an installation for treating effluents from surface treatment, high-pressure pickling and dye penetrant testing workshops with a view to recycling them and not having any on-site discharges.

Solution proposed

  • Dechromatation with bisulphite in an acid environment
  • Neutralisation
  • Filtration through a media break-up filter
  • 40 m3 buffer storage
  • Evaporative concentration by mechanical steam compression
  • Cooling
  • 40 m3 buffer storage
  • Adsorption of organic materials through activated carbon
  • Polishing using ion exchange resins
  • Disinfection by a UV reactor

Operational results
Zero discharges on-site, and recycling of very good quality water

Economic results
Water savings, no obligation for self-inspection analyses, and no tax on discharges Energy savings with the mechanical steam compression

Environmental results
No discharge non-compliance

Customer satisfied with full turnkey execution integrating the project management responsibility for dismantling the existing structures, the coatings of the worksite floors, the civil engineering work, and the soundproofing walls.