Investigation of Chemical Coagulation and Flocculation Efficiency of Different Coagulants)Alum, Ferric Chloride, Pacl, And Lime) in Navy Blue CE-RN Textile Dye Removal from Aqueous Solutions

In this study, coagulation efficiency of alum, ferric chloride, polyaluminium ýchloride (PAC), and lime was investigated in the removal of Navy Blue CE-RN dye from textile wastewater.
Characteristics of dye such as dominant wavelength, hue, luminance degree, and purity of Navy Blue CE-RN were determined through spectrophotometric-multi-wavelength method. Optimum dose, optimum pH, and sludge volume index (SVI) of coagulants were determined using jar test. The efficiency of coagulants was compared in optimum conditions. Cost and removal efficiency were considered in the selection of the best coagulant.
Findings: The obtained dominant wavelength, luminance degree, and purity of dye were 473 nm, 19%, and 53%, respectively. PAC (dose of 0.1 g/l and optimum pH = 6) had the highest removal efficiency in the removal of Chemical oxygen demand (COD) and dye (84% and 93%, respectively). The SVI of PAC was 1324 l/g.
The results of this study showed that PAC can be an appropriate, efficient, and cost-effective coagulant in the removal of Navy Blue CE-RN dye.