REMOVAL OF COLOR AND COD OF DYE MANUFACTURING WASTEWATER BY COMBNATION OF FENTON OXIDATION AND SBR

Environment engineering

A dye is a natural or synthetic substance used to add a color to or change the color of something. Synthetic dyes are further described as Acetate rayon dyes, Acid dyes, Azoic dyes, Basic dyes, Direct dyes, Mordant or chrome dyes, Lake or pigment dyes, Sulfur or sulfide dyes and Vat dyes. More than 70% of total dye is azo dye. Maharashtra and Gujarat represent 90% of dyestuff generation in India because of the accessibility of raw materials and dominance textile industry in these regions. They are considered as a more perilous wellspring of environmental issue. High chemical oxygen demands (COD), biochemical oxygen demands (BOD), suspended solids and intense color because of color intermediates or deposits and assistant chemicals describe from the dye production process. As synthetic dye are found to be water soluble which can give color to water this can be seen when even in small amount, dye are found to be poisonous and carcinogenic when disposed directly to water source, dye are often found in waste water in manufacturing unit as well as textile dye process. It is necessary to remove dye from waste water before disposal as they are hard to remove biologically and can be harmful for further use of water. Fanton oxidation converts dye molecules into simple molecular structures, which can easily degrade by microorganisms. This study was done combining both e Fenton oxidation and biological(aerobic) treatment for effective treatment line.. Experiments were carried out to find the optimum conditions for Fenton oxidation and Aerobic treatment. The optimum conditions are as follows for Fenton Oxidation pH is 3, FeSO4 concentration is 60 ppm, H2O2 concentration is 500 ppm and time is 45 minutes. 57.73% Color and 40.06% COD reduction is achieved in Fenton Oxidation. For aerobic treatment Sequential Batch Reactor(SBR) is applied. Experiments carried out to find out reaction time of SBR. Optimum reaction time is 24 hr. with 2500 mg/L MLSS. After SBR process Further 70% and 66% reduction of Color and COD respectively is achieved to Fenton oxidation treated wastewater. And the total reduction in Color and COD achieved are 87.8% and 79.6% respectively.

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