Efficacy study of Manganese removal from municipal drinking water using powdered eggshell
Journal of Health in the Field,
,
13 Farvardin 2020
Abstract
Background and aims: Manganese, a potential threat in drinking water, enters in water resources via natural (rock weathering) and anthropogenic (petrochemical industries) sources. The aim of this applied-analytical study is to investigate Manganese removal efficiency from urban drinking water using powdered eggshell.
Materials and Methods: This study was done in laboratory scale using an experimental batch reactor. Water samples obtained from municipal drinking water of Tehran distribution network were polluted by predetermined concentrations of Manganese. The Manganese removal efficiency was studied as a function of concerned variables including pH (4-9), contact time (30-90 min), powdered eggshell doses (1-3 g/l), and Manganese concentration (3-9 mg/l). The residual Manganese concentration was determined according to the persulphate procedure using a spectrophotometer at 525 nm. The experimental results were analyzed with Langmuir and Freundlich equilibrium isotherm models as well as the first and second order adsorption kinetic models. All phases of the study were performed ethically.
Results: The best conditions for Manganese removal (100%) were obtained to be pH 6.5, contact time 90 min, adsorbent dose 2 g, and Manganese concentration 9 mg/l. Adsorption process was followed by the first order adsorption kinetic model (R2<0.894) and Freundlich equilibrium isotherm (R2<0.752).
Conclusion: In total, the findings show that the powdered eggshell could be a suitable, efficient, and low cost adsorbent for Manganese removal from drinking water, in comparison to other adsorbents.
Keywords: Adsorption, Manganese, Powdered Eggshell, Urban Drinking Water.
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