Abstract
In this study, salicylic acid, an important and widely used micropollutant in the pharmacy sector, removal by electrocoagulation process was investigated. Electrocoagulation and electroflotation processes are commonly used techniques in electrochemical treatment. The type of electrode material employing in electrochemical processes is one of the basic variables which determining the process performance. In the experiments, iron and aluminum plates were employed as a hybrid electrode combination in the electrocoagulation process. The effect of current density, initial pH, electrolysis time, and electrical conductivity were investigated. For this purpose, the current density was 20 A/m2 and 100 A/m2, initial pH 5-8, electrolysis time 2-50 min electrical conductivity 250-1000 µs/cm range and electrode connection type monopolar parallel (MP-P) salicylic acid removal efficiencies from aqueous solutions were investigated during the experimental studies. The best removal results were obtained at pH 6 with a current density of 80 A/m2, solution conductivity of 750 µs/cm, and 40 min of electrolysis time. In these operation conditions, operation cost, amount of sludge, and removal efficiency of salicylic acid were determined as 1.34 $/m3, 0.8 kg/m3, and 91.4%, respectively.
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