Adsorption And Regeneration Of Activated Carbon In Dye Wastewater Treatment

Dye wastewater comes from many batch processes, such as the dye manufacturing industries and the dye-consuming industries. If dye wastewater is released into environment directly, it will lead to heavy effects on exposed organisms due to the toxicity of the dye, abnormal coloration as well as reduction in photosynthesis because of the absorbance of light that enters the water. This influences public water quality greatly. So decolorization of dye wastewater is very important and imperative.Activated carbon (AC) has been widely used as an adsorbent in wastewater treatment, and it can remove a wide range of dyes. But AC is expensive and its regeneration is difficult. If saturated AC can be regenerated, it will not contaminate environment and the cost of treatment of dye wastewater with AC will decrease largely.In this paper AC was used as adsorbent to treat fuchsin acid, fuchsin basic or reactive black B-133 dye wastewater respectively. Effect factors including adsorption time, temperature, initial concentration, pH and quantity of AC were discussed in detail. AC saturated with fuchsin acid, fuchsin basic or reactive black B-133 was regenerated experimentally, and the regeneration conditions were also studied to get the optimal conditions.The results showed that AC can adsorb fuchsin acid, fuchsin basic and reactive black B-133 effectively, and the experimental data on adsorption equilibrium isotherms of the three dyes on AC can be fitted well by Freundlich isotherm equation. The equilibrium time of the three dyes is 3.5 h, 6 h and 17 h,...