Mahnaz tora bi hokmabadi; Ahmad Allahabadi; Gholamreza Moussavi
Volume 26, Issue 3 , September and October 2019, , Pages 273-283
Abstract
Herbicides, including atrazine, are among the most important newly discovered contaminants found in water bodies and are hazardous to human health and the environment. adsorption is one of the best techniques used to remove these contaminants from contaminated water. Materials and method: In this ...
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Herbicides, including atrazine, are among the most important newly discovered contaminants found in water bodies and are hazardous to human health and the environment. adsorption is one of the best techniques used to remove these contaminants from contaminated water. Materials and method: In this study, two carbon from waste Pomegranate and calligonum Comosum were used to remove atrazine herbicide. After chemical activation these carbons with NH4Cl, and then 800 ° C for 2 hours, parametric tests were performed and the effect of pH, adsorbent concentration, atrazine concentration and contact time were investigated; then absorption equilibrium tests; absorption capacity and its isotherms investigated for the removal of atrazine by two carbons were calculated. Results: The results showed that the carbon produced from the calligonum Comosum wood in optimal conditions at pH =7; carbon concentration 0.2 g/L, and the mixing time of 50 minutes could remove 100% atrazine at 25 mg/L . The carbon produced from pomegranate in optimal conditions pH =6; carbon concentration of 0.2 g/L and mixing time of 50 minutes could remove 91.5% atrazine to 25 mg/ L. Absorption equilibrium tests showed that the absorption capacity of carbon Calligonum Comosum and pomegranate were 672 and 645mg/g respectively. Discussion The results of this study showed that both carbons have high absorption capacity in the removal of atrazine herbicide and can be an effective and economical absorbent for the removal of this contaminant from natural waters.
Gholamreza Moussavi; Ahamd Allahabadi; Milad Ganbary; Morteza Dab; Fahimeh Mircholi
Volume 23, Issue 4 , September and October 2016, , Pages 652-661
Abstract
Background Malathion is a pesticide with the highest consumption in phosphoric pesticides. This pesticide has acute and chronic effects. Therefore, for the protection of the water and human health against the harmful effects of these compounds, they must be removed by appropriate treatment of wastewater ...
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Background Malathion is a pesticide with the highest consumption in phosphoric pesticides. This pesticide has acute and chronic effects. Therefore, for the protection of the water and human health against the harmful effects of these compounds, they must be removed by appropriate treatment of wastewater and water resources. Among the treatment methods, the ozonation process has drawn more attention; one of the best options of ozonation process is the catalytic ozonation process (COP)with activated carbon.Materials & Methods In this study, at first the synthetic wastewater was prepared at the mentioned concentration with pure malathion. Then, removal malathion experiments in a cylindrical pilot with a total volume of 200 mL were performed by single ozonation and catalytic ozonation process with use of NH4Cl-induced activated carbon (NAC) obtained from of agricultural waste. Study variables included pH, contact time, the concentration of ozone, and the concentration of catalyst. In all conditions, the sole catalytic ozonation adsorption and catalystic synergistic effects were evaluated.Results The results showed that the removal efficiency of ozone in alkaline pH is higher. Also, in 200 mL samples containing 50 mg/L malathion and 0.1 g/L concentration of catalyst in carbon NAC, in the COP test for 50 minutes, the malathion removal performance was 62.9% in ozonation; 100% in catalytic ozonation, 22% in adsorbtion only, and 15.1% in the synergism effect. It showed the high removal efficiency of COP/NAC.