Water bath - Import export

Oil-water-separation / degreasing bath treatment Treatment of oil-water-emulsions for surface treatment (e.g. pre-treatment of metal parts for ed-paint), recovery companies (e.g. for the treatment of alkaline emulsions for part washing), and so on. Separation of emulgated oil particles and recycling of the cleaned liquid into the degreasing bath Concentration of oil-water-emulsions for disposal Cleaning of the oil-water-mixture for indirect lead-in Principle of this process: Aqueous degreasing baths content a tenside combination, alkalines like soda, caustic soda, phosphate, silicate and further complex molecules. The degreasing bath is loosing its efficiency, when to oil content reaches some g / litre. External pollutions also degrease the degreasing efficiency. By ultrafiltration, the oil content can be separated from the degreasing bath and the oil will be collected in the concentrate. The degreasing bath will be dumped into a buffer tank and then pumped in the working tank of the

Ultrafiltration of kathodic deposition paint The filtrate of the ultrafiltration is added to the immersion bath by a spray ring, which is installed directly over this bath. So, the recovery of the remaining color is possible and by separation the color particles, painting defects can be avoided. In the last spray zone, organic solvents from the ultrafiltration are washed away be demineralised water. Concentrated with these solvents, the water is leaded into the color bath. The process is a closed loop without any waste waters. The paint bath can be contaminated with pre-tretment chemicals like e.g. phosphates, chlorides, chromates. so, a part of ultrafiltrate has to be leaded out to avoid concentration of the paint bath with these chemicals. If no ultrafiltration is used, big amounts of waste waters will arise, which are difficult to dispose. Our ultrafiltration plants are customized in membrane are, retention rate and membrane type.

Recovery of acids and acidic rinse waters Additionally to the pickling bath treatment by microfiltration and ultrafiltration, the recovery of acid becomes more and more important. Additionally to sulphuric and hydrochloric acid, also mixed acids (HF / HNO3) can be recovered. The first step of the acid recovery is mostly a sludge separation by microfiltration. Downstream, diffusion dialysis, electrodialysis or nanofiltration is used for metal separation. For the treatment of rinse waters, OSMO Membrane Systems GmbH offers reverse osmosis or electrodialysis plants.