Decontamination / Detoxification
Chriwa offers a wide range of different process solutions for the decontamination of water. For this purpose, special and highly optimised physical and chemical processes are used, which guarantee the highest treatment quality.
Detoxification means the removal of all harmful wastewater constituents through chemical reactions. In a narrower sense, this means the destruction of cyanide or the reduction of chromates. The classical form of cyanide detoxification takes place through the addition of hypochlorite and reaction to cyanate and common salt (NaCN + NaOCl = NaCNO + NaCl). Chromate reduction is achieved by the addition of bisulphite and sulphuric acid with reaction to chromium sulphate, Na-bisulphate, Na-sulphate and water (Na₂Cr₂O₇ + 3NaHSO₃ + 4H₂SO₄ = Cr₂(SO₄)₃ + 3NaHSO₄ + Na₂SO₄ + 4H₂O).
For example, chromate detoxification is a treatment of chromate in the reaction with bisulphite (NaHSO₃) to form chromium sulphate (Cr).
