جستجوی مقالات مرتبط با کلیدواژه « aqueous system » در نشریات گروه « پزشکی »

The presence of nitrate in drinking water causes various health and environmental problems. The aim of this study was to evaluate the efficacy of nitrate reduction by Fe/H2O2 process and adsorption on activated carbon. This experimental study investigated nitrate oxidation by advanced oxidation process of Fe°/FeІІ/FeШ/H2O2 at pH 2-10، nitrate concentrations of 50-300 mg/L. After adjusting the pH، 0. 5، 1، 2، 5، and 10 g/L values of GAC، PAC، H2O2/GAC، and Fe/H2O2/GAC together with H2O2 at retention times of 15، 30، 45، 60، and 90 minutes، respectively، were added and mixed. At retention time of 10 minutes and 0. 5 mL H2O2 and 1 g/L from Fe°، FeІІ، and FeІІІ، the removal efficacy was 88. 5، 84 and 78%، respectively. At 50 mg/L nitrate and 0. 5، 1، and 10 mg/L GAC concentrations، the removal efficacy was 56. 5، 93. 6، and 82. 6%، respectively. The nitrate removal efficiency at pH=4 was approximately 50%، whereas at pH=3 with 30% efficacy، it increased to 80%. Modified Fe/H2O2 process with iron nano-particles and activated carbon adsorption can effectively reduce nitrate under optimal conditions. The use of activated carbon at a concentration of 1 g/L increased the removal efficiency of nitrate to 90%.