Technological progress is continually expanding the methods used for the pre-treatment of industrial wastewater, with the objective of achieving a high level of purification in order to limit discharge into the natural environment and, where possible, enable the reuse of treated water.
The metal industry uses several manufacturing processes involving aqueous solutions (cooling fluids, leaching solutions, galvanic solutions, mechanochemical polishing solutions, and floor washing water).
The pollution generated is mainly related to the following elements:
- Dissolved organic matter contributing to a high COD (Chemical Oxygen Demand)
- Emulsified oils and greases contributing to a high hydrocarbon content
- Dissolved salts and heavy metals whose concentration is strictly controlled
- Solid metallic and mineral particles
To treat industrial wastewater, comprehensive expertise is required in order to design a process that balances efficiency and cost-effectiveness. Below are some considerations regarding the selection of a technology adapted to the type of discharge:
Used cleaning baths
Ultrafiltration for recycling and evaporative concentration as a pre-treatment before discharge to the sewer system.
Floor washing water
Evaporative concentration before discharge to the sewer system.
Cooling fluids (soluble oils)
Magnetic separation for recycling; coagulation and hydrostatic filtration for recycling; evaporative concentration for pre-treatment before discharge to the sewer system.
Mechanochemical polishing effluents
Coagulation and hydrostatic filtration or centrifugation for recycling; heavy metal insolubilization, coagulation, flocculation, and filtration for pre-treatment before discharge to the sewer system.
FAQ
What regulations apply in Switzerland?
In general, it is prohibited to discharge wastewater from a manufacturing process into the public sewer system without verifying its compliance with the Federal Ordinance on Water Protection (OEaux) of October 28, 1998 (status as of January 1, 2014).
Why choose NGL Water Technology?
Our systems are modular and adapt to the space available on site as well as to the evolution of your processes over time. From simple filtration to a complete zero-discharge treatment solution, our AQUA4D®, Nanoclean, Decofloc processes and our evaporator provide solutions to all your wastewater treatment challenges.
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