Electrochemical treatment of inorganic compounds and gaseous effluents

4 Electrochemical treatment of inorganic compounds and gaseous effluents 

The valence states of most inorganic compounds can be changed by either cathodic reduction or anodic oxidation. Thus in principle appropriate species can be either recycled electrochemically or converted to less toxic and environmentally acceptable forms. Sulphur and nitrogen based compounds are thus typically encountered. For example the reduction of nitrates and nitrites and the oxidation of sulphur compounds, such as sulphite, thiosulphate and dithionite, can be carried out quite effectively. There are several established technologies for cyanide and chromium species. 

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