Intensification of Machine Building Enterprise Plating Wastewater Treatment

Application of asymmetric current for electrocoagulation treatment of oil-containing waste water

“…Anodic dissolution of aluminum occurs during the process of wastewater electrocoagulation, containing emulsified oil products. In a slightly acidic and neutral medium, sparingly soluble aluminum hydroxide [Al(OH) 3 (H 2 O) 3 ] is formed with a highly developed surface, which determines the high adsorption capacity with respect to particles of oil products and suspended solids [5]. In order to determine the composition of the sediments generated during the process of wastewater electric treatment, containing emulsified oil products, a differential thermal analysis was performed with the use of NETZSCH STA 449 F1 instrument in the range of 30/20.0 (k / min) / 1000 in the DSC -TG mode (Figure 4, where DSC -differential scanning calorimetry, μV / mg; TG -mass change curve,%; DTC -differential thermogravimetric curve,% / min).…”

“…Electrocoagulation is accompanied by electricity and metal consumption. The current shape influences the energy consumption in the process of obtaining metal ions, generated in the electrolyte [5,8]. Direct and alternating electric currents are used for the electrochemical coagulation of colloid-dispersed particles [1,2,9].…”

“…The use of reverse current makes it possible to reduce the energy consumption, however, the cleaning effect decreases with an increase in the duration of electrodes continuous operation, as it is shown in a scientific paper [5]. A method for treating oilcontaining effluents with an asymmetric current was developed in order to stabilize the process [8].…”