Removal Or Degradation Of Acid Dye From Aqueous Solution

The acid dye wastewater is characterized with high value of CODcr, complication of organic components, more difficult remediation, and high colority. Increasing attention has been focused on the economic and efficient procedure for the decolorization or degradation of acid dyes aqueous solution. Progress in treatment of acid dye pollutants in water is reviewed.Decolorization or degradation of acid dyes aqueous solution by using activated carbon or ultrasound irradiation combining Fly ash and H2O2 were studied. The results showed that the processes were effective in removing acid dyes from aqueous solution.Activated carbon was used to treat acid orange 3 aqueous solutions. The influence of various factors such as contact time, reaction temperature, pH value, the initial concentration of the dye and the dosage of activated carbon were systematically evaluated. The model of acid dye adsorption on activated carbon was described. Low pH value was in favor of the removal of the dye. The results showed that the Langmuir isotherm and pseudo-second order kinetic model were well fitted into the experimental data. In the optimum conditions, the removal ratio of Acid orange from aqueous solution was 98%.Fenton-like process is one of the advanced oxidation technology, and it combined with ultrasound is effective to degrade the organic contaminations. In the combination of ultrasound and Fenton-like reagent, the degradation efficiency of 98%(acid orange 3) and 96%(acid brown 348) was achieved respectively. The possible intermediates during degradation process were monitored with UV-Vis spectrum and LC-MS. Based on the data, a possible pathway for the degradation of acid orange 3 and acid brown 348 were proposed.