IMPROVEMENT OF TECHNOLOGY FOR REAGENT TREATMENT OF WASTEWATER FROM DYES
IJMIJH
DOI:
https://doi.org/10.25712/ASTU.2072-8921.2025.01.027Abstract
Colored wastewater is formed in industrial production at many enterprises due to the ingress of various dyes into their composition. A particularly large volume of colored effluents is observed in the dyeing of fabrics and leather at light industry enterprises. Wastewater containing dyes has high COD values due to the significant content of organic substances in them and cannot be discharged to biological treatment plants due to the threat of death of the biocenosis of microorganisms of activated sludge. This circumstance requires local treatment of colored wastewater in the places of formation. We have investigated the possibility of cleaning intensely colored wastewater from Egida LLC, Kazan using various methods. Initially, the dilution of colored wastewater with industrial water in a ratio of 1:50 was carried out and the subsequent oxidative degradation of organic compounds with Fenton's reagent. The optimal ratios of reagents have been determined, at which the greatest reduction in COD values is achieved: 40 cm3 of a 10% FeSO4 solution and 200 cm3 of a 30% H2O2 solution per 1 dm3 of the treated wastewater. The oxidized wastewater was neutralized with a 5% sodium hydroxide solution and subsequent filtration of the resulting iron hydroxide precipitate. It was revealed that the use of a suspension of calcium hydroxide is technologically unjustified due to the large volume of the resulting difficult-to-recycle sludge. Aftertreatment of the neutralized runoff was carried out under the action of a biocenosis of microorganisms of activated sludge, which allowed the wastewater to discolor and use it as process water to dilute the original-colored liquid. The technological scheme of the developed process of combined purification of highly colored wastewater is proposed.
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