Removing Copper from Contaminated Water Using Activated Carbon Sorbent by Continuous Flow

Introduction: A major concern of human being is accumulation and toxicity of heavy metals in their body. Copper is a heavy metal ion that in concentration of ۲ mg/l can cause numerous complications. Different treatment methods have been proposed for removing metals from contaminated water by researchers. Among these methods, sorption seems a better method with high removal efficiency. In this study, conditions for removal of copper ions by activated carbon sorbent were studied with continuous flow. Materials & Methods: This was a laboratory – experimental study. A ۲۰mg/l solution of copper ions was prepared and passed through a ۵ × ۱۰ cm column with average output rate of ۱.۸۵ ml/min. Output of column was sampled every ۳۰ minutes and the remaining amount of copper ion in each sample was measured by flame atomic absorption. Results: The empty bed volume (EBV) was equal to ۱۳۸ ml. The highest removal efficiency was ۹۹.۷ percent at ۱۲۷ minutes. From equilibrium time, the removal efficiency was constant with time. The adsorption capacity of activated carbon was ۰.۲۵mg.g-۱. The isotherm study indicated that the sorption data can be obeyed by both Langmuir and Freundlich isotherms (R۲>۰.۹۵) but Langmuir model had higher agreement with this experimental data (R۲= ۰.۹۸۸). Conclusion: The binding of ions to the sorbent in the adsorption process is extremely important. For this column ۶۲.۵ minutes after filling was appropriate, so the highest removal efficiency was obtained. Equilibrium time was dependent on the speed of influent through the column in the continuous flow. For selected column, the rate of ۱.۸۵ ml/min is a good performance.

کلیدواژه ها:

Copper ، Absorbent Pad ، Charcoal ، Water Pollution ، Water Pollution Chemical ، Copper ، Absorbent Pad ، Charcoal ، Water Pollution ، Water Pollution Chemical