Electrochemical Purification of Alkaline Solutions After Bleaching of Fabrics
This paper contains results of investigations concerning the treatment of wastewaters from the process of cloth bleaching in cotton industry plants. It was found that the application of electrochemical oxidation allows about two-fold acceleration in liberation of organic compounds contained in lyes, as compared with natural sedimentation. The process of electrolysis brings about a two-fold increase in the amount of liberated organic compounds.
On average, from 1 dm3 of wastewaters about 250 cm3 of sediment or ca 20 g of dry substance is obtained. Investigations of electro-oxidation were carried out using a titanium electrode coated with a layer of RuO2 + TiO2 oxides, over the potential range 400–1000 mV. The progress in the reaction was determined from changes in COD values of lyes. Most advantageous results were obtained at a potential 600 mV and current density 1 A/dm2. The results obtained indicate possible intensification of liberating organic substances from post-bleaching lyes. Sodium hydroxide solutions treated in this way can be recycled in the process.
KeywordsChemical Oxygen Demand Electrode Potential Anodic Oxidation Electrochemical Oxidation Sodium Hydroxide Solution
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