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1 Journal of Water and Land Development

1 2022

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The removal efficiency and reaction mechanism of the aluminum coagulant on phenolic compounds in the presence of hardness salts

Hecini Lynda, Boukerker Hassen, Kherifi Wahida, Mellah Abdelkarim, Achour Samia

Journal of Water and Land Development

2022

no. 54

225--233

This study is the evaluation of the coagulation efficiency of the aluminum sulfate on the removal of catechol and pyrogallol. The study has focused on the impact of inorganic components of hardness Algerian waters. Jar-test trials were conducted on the two phenolic compounds dissolved in distilled water only, which was later enriched with minerals. Several reaction parameters varied, including the effect of pH and the influence of the salt content, and this approach yielded a better understanding of interaction between phenolic compounds and calcium/magnesium salts. The results indicate that the process efficiency depends on the number and position of OH in molecules. The main mechanisms would be either a physical adsorption, an exchange of ligand, or complexation on the floc surface of aluminum hydroxide. Moreover, the addition of inorganic salts appears to improve removal efficiency of tested phenolic compounds and have an effect on the optimal pH range for coagulation.