(1) Natural decomposition method: volatilization method; biological decomposition method; oxidation method; photolysis method.
(2) Oxidation method: alkaline chlorination method: chlorine gas method, hypochlorite method, electrolytic regeneration method; SO 2 -air method; ozonation method; hydrogen peroxide method; acidification-volatilization-re-neutralization-AVR method ; assay: iron sulfide, ion exchange and acid regeneration process, ion flotation; electrolysis; transformation - precipitation method: into thiocyanate, ferrocyanide into - ferricyanide.
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