جستجوی مقالات مرتبط با کلیدواژه "کمک منعقد کننده" در نشریات گروه "پزشکی"

Natural organic substances in water cause problems during water treatment processes. The potential of these compounds as precursor of trihalomethanes formation has increased the necessity of removing these compounds from water more than ever. In the current study, the effect of chitosan, as a cheap and efficient coagulant, in the electrocoagulation process with iron electrode for removal of humic acid from aqueous solutions was evaluated. In this study, a batch reactor equipped with 4 iron electrodes in dimensions of 2*20*200 mm, with a volume of 1 L and connected to an electrical source was used. The effects of current density, initial humic acid concentration, chitosan concentration and pH in the electrocoagulation process were investigated. Excel software was used to analyze the obtained results. The results indicated pH = 6, current density=40 V, and chitosan concentration= 2 mg/L as the optimal conditions for the process. Also, in the presence of chitosan as a coagulant aid in the electrocoagulation process, after 60 min, the process efficiency reached 68%. Based on the current findings, electrocoagulation process is a suitable process in removal of humic acid. Also, chitosan is an efficient coagulant aid in the electrocoagulation process with iron electrode and increases the process efficiency.

Cyanide ion is one of the most dangerous compounds for the man. Electrocoagulation process with high efficiency to removing pollutants, than researchers considered a effective process. The aim of this study was to determine the efficiency of electrocoagulation process by aluminum electrodes in cyanide removal from synthetic wastewater using magnesium oxide as a coagulantaid. Mehods: In this study, a reactor with four aluminum electrodes with dimensions 200 × 20 × 2 mm use of 1 Liter of useful volume of electricity generating device for the removal of cyanide was used. Effect of parameters such as pH(3-9), voltage (10-30 V), the initial concentration of cyanide(50-500 ppm) and different concentrations of magnesium oxide particles (0.1 to 1 mg l) as coagulant aid in the process were investigated. The results show that the efficiency of EC process at pH 5, voltage of 30 V and an initial concentration of cyanide, 50 mg/lit in 45 minutes, was 80 percent. process will Efficiency by adding coagulant aid. In optimal amounts of coagulant aid (0.1 mg/lit) in electrocoagulation process on the removal of the cyanide 90% was achieved. Electrocoagulation process is suitable process for the removal of cyanide. Also, Magnesium Oxide as a coagulant aid in this process was good and increase process efficiency.