Abstract
The main purpose of this work the removal efficiency of the pesticide imidacloprid and chemical oxygen demand (COD) from aqueous solution using the electrocoagulation process. The effect of several parameters such as initial pH, initial imidacloprid concentration, current density, type of electrolyte, salt concentration, and temperature on the pesticide and COD removal efficiency was investigated on EC performance. The obtained results showed that imidacloprid and COD removal were 95% and 89.5% by using Fe electrodes at 60 min and were 80.8% and 73.1% by using Al electrodes at 90 min. Pesticide removal kinetic followed pseudo second and first order kinetics using Fe and Al electrodes respectively. It can be concluded that electrocoagulation process by Fe electrode is very efficient and clean process for imidacloprid removal and COD from wastewater.
Highlights
The wide use of pesticides gives rise to serious ecological problems due to their negative environmental effects
It has been established that the influent pH is an important operating factor influencing the performance of electrochemical process [39]. These experiments were carried out to evaluate the effect of pH, using solutions containing a sample with an initial pH varying in the range (2.4 -10) at initial concentration of 50 mg L-1, inter electrode distance of 1 cm, a current density of 18.5 mA /cm2, NaCl concentration of 1 g L-1 and temperature of 20°C
The removal efficiency of imidacloprid from aqueous solution was examined by electrocoagulation using iron (Fe) and aluminum (Al) electrodes
Summary
The wide use of pesticides gives rise to serious ecological problems due to their negative environmental effects. The EC process has many advantages like simple equipment requirement, easy operation, no chemical use requirement, rapid sedimentation, sludge stability, low sludge production, and environmental compatibility It has successfully been employed for the treatment of different wastewaters such as from hospitals [12], baker’s yeast [13], laundries [14], biodiesel [15,16], and slaughter houses [17], wastewaters including surfactants [18], fluoride [19] and heavy metal-containing solutions [20,21]. This study involves the investigated removal efficiency and COD of imidacloprid using iron and aluminum electrodes in aqueous solution by electrocoagulation method. Where Co and C are concentrations of wastewater before and after electrocoagulation
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