Removal of Machine industrial from wastewater using cylindrical flow reactor by electrochemical oxidation and optimization of treatment conditions

Abstract

This work examines the use of electrooxidation for treatment of wash water obtained from industry. Cutting oil was mainly found in the wastewater. The effluent was treated using NaCl as supporting electrolyte using a cylindrical flow reactor in continuous (single pass) mode under various current densities (2-5 A/dm²) and different flow rate (10-40 L/h).  By cyclic voltammetric (CV) analysis, the best condition for maximum redox reaction was found. Efficiency of COD reduction and power consumption were studied for each operating conditions. From the results maximum COD reduction of about 93.3 % was obtained at a flow rate of 10 L/h with applied current density of 4 A/dm². FT-IR spectra studies showed that during electrooxidation, the intensities of characteristic functional groups such as C-H, O-H were reduced and also some new peaks comes to appear. Probable theory, reaction mechanism and modeling were proposed for the oxidation of machine industrial effluent. All the experimental results have indicated that electrooxidation treatment was very effective and was capable of elevating quality of the treated wastewater effluent to the reuse standard of the machine industry.