NOVELTY – The electro-chemical treatment of liquid effluent containing eg. cyanides comprises anodic oxidation of the cyanides with or without complexing heavy metal ions. It also gives cathodic removal of heavy metal ions, with overall 99.9 per cent efficiency. The anodes used are dimensionally stable (titanium coated with metal oxides). USE – In applied chemistry.
D15 (Chemical or biological treatment of water, industrial waste and sewage – including purification, sterilising or testing water, scale prevention, treatment of sewage sludge, regeneration of active carbon which has been used for water treatment and impregnating water with gas e.g. CO2, but excluding plant and anti-pollution devices (C02).)