| المستخلص: |
The present study aimed at evaluating the management process of lead (Pb) removal from water and wastewater using three types of algae as a biosorbent material. At first, the removal efficiency was calculated in a batch system. Afterwards, management system using three biosorbents as filter media was established. The effects of some parameters such as pH, temperature, biosorbent dose were investigated as well. The results showed that the brown algae have the highest Pb adsorption capacity while the blue type algae have the lowest Pb adsorption capacity. The maximum Pb removal efficiencies of the brown, green, and blue algae were 95.67, 92.24, and 88.92 mg/g, respectively. For each algae type, the highest Pd removal occurred at room temperature and the pH value of 6. Of all studied influential parameters, the pH of the medium has the largest effect on the efficiency of removal of Pb. Isotherm investigations implemented at varied initial metal concentrations uncovered that the Freundlich model which described the process of Pb removal the best. The Freundlich model constants were calculated by linear regression analysis using the Microsoft Office Excel program then. Thereafter, the analysis results were used to determine the algae quantity needed in the filtration process for optimum Pd removal. Though it did not demonstrate the highest adsorption capacity, green alga proved to be the most appropriate material and alga type to be used in the filtration process according to the calculations of the total cost in the management process. Lastly, this study showed that the algae are quite a cost effective material for biosorption of Pb and for its removal from aqueous solution.
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