Acids in industrial waste water represent enormous disposal costs and pose a danger to employees and the environment. Our goal is therefore the recovery or processing of these (in)organic acids. In this way, such substances can be returned to the production process without a costly use of chemicals for neutralisation (and its disposal) being necessary. We achieve this through an interaction of evaporation and crystallisation processes, ion or selective exchangers, via membrane dialysis and other processes.
Polishing bath recovery at Nachtmann lead crystal plants
With the aid of this evaporation system, a mixture of rinsing waters containing sulphuric acid as well as waste acid with a weight concentration of about 20 to 65% is concentrated to 85% H2SO4 and used again for polishing. There are impurities of hydrofluoric acid with around 1% weight concentration.