Abstract
Mixture of sodium thiosulfate and sodium formate contaminated effluent is produced by sodium dithionite industry, which was treated by electrochemical oxidation process. Platinised titanium (Ti/Pt) mesh and titanium (Ti) mesh were used as anode and cathode respectively. Nafion 961 cation exchange membrane was used as ion exchanger and acted as separator in the membrane cell. The investigation was done by potentiostatic mode (3.0 V). The cyclic voltammetry (CV) study revealed the oxidation potential of thiosulfate and formate. About 95.44 % of sulfate conversion was achieved and 70 % formate was mineralised by this new route. Dispersed sulfur particles were noticed in anolyte compartment and complete thiosulfate conversation was confirmed using UV–Vis spectroscopy and volumetric estimation. Besides, caustic was recovered by this process.
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