Color and COD Removal from Textile Effluent Using Alum and FeCl3 Coagulation

Abstract

Textile dyeing companies use large amounts of water and chemicals during thedyeing process. Large amounts of sewage containing hazardous materials havebeen released into a nearby water bodies, posing a threat to environmentalsustainability. The aim of this research was to find out how the type and dosageof coagulant affect the removal of colour and COD from industrial wastewatercontaining dye using ferric chloride and Alum. The efficiency of thesecoagulants was determined using the jar test, which examined the percentagefrom dye removal in different wastewaters, coagulant dose, initial dyeconcentration, mixing velocity, and sedimentation duration. The highestdecolorization efficiencies for FeCl3 and Alum coagulants were 81% and 81%,respectively. Rremoval COD was 46% and 42% for FeCl3 and Alum,respectively. Where pH 11 and coagulant doses of 20 and 30 mg/L for FeCl3 andalum, respectively, the coagulants performed better. The results of the studyrevealed that FeCl3 is more successful than Alum in removing color and CODfrom industrial effluents containing Congo red dye. Because the dose ofcoagulant used is less. On the other hand, the physicochemical method can beused as a successful pre-treatment method before subsequent treatment of thepartially stabilized leachate.