Treatment of Wastewater Containing Reactive Dyes by electro-Fenton Method

摘要

The textile dyeing wastewater pollutes the environment with the presence of residual highly reactive dyes. In this study, real textile dyeing wastewater collected from Textile and Dyeing Kim Thanh Hung (KTH) Company and synthetic wastewater prepared from Suncion Red (SR) and Suncion Blue (SB) reactive dyes were used. Fourier-transform infrared spectroscopy analytical results showed that electro-Fenton was effective in textile dyeing wastewater treatment due to its ability to decompose and transform dyes and cyclic compounds. From experiments on effect of FeSO4 and NaCl amounts, it is discovered that the removal efficiencies of color and COD fluctuated depending on the amounts of two chemicals. And, the suitable conditions for high color removal in batch electro-Fenton model including a 24V-10A of DC power supply and a 100 cm^{2 of MMO electrode was found to be in pH range 2 – 4, with the dosage of FeSO4 and NaCl are 1 and 15 g, respectively for 3 L of wastewater. Besides, the efficiencies of color and COD removal from SR dyes were higher than those from SB dyes. On the contrary, the SB’s decolorization rate was faster than that of SR through the difference of the rate constant obtained from kinetics study.}