Electrochemical Regeneration of Chromium Containing Solution from Metal Finishing Industry

Abstract

The electrochemical regeneration of chromium containing solution obtained from metal finishing industry was carried out using different anode materials (lead & platinished titanium) and cathode materials (lead and stainless steel). Effect of different parameters like anode current density, catholyte concentration, temperature, and anolyte flow rate on current efficiency was studied. At current densities of 2−2.5 A/dm2 using lead as anode at temperature of 303−313 K and anolyte flow rate of 130 − 300 cm3/min, the current efficiency of 68 − 76% with an energy consumption of 3.0 to 3.2 kWh/kg CrO3 was achieved.

Effect of acid modification on adsorption of hexavalent chromium (Cr(VI)) from aqueous solution by activated carbon and carbon nanotubes

“…Chromium is found in natural deposits which contain other elements such as ferric chromite (FeCr 2 O 4 ), chrome ochre (Cr 2 O 3 ), and crocoite (PbCrO 4 ) [1,2]. Industrial sources of chromium are wastewater from textile industry, wood preservation, glass industry, dyes and pigments, production of steel and alloys, mining of chrome ore, leather tanning, electroplating, and metal cleaning [2][3][4][5].…”

Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers

“…When they enter into the human body, it causes various disorders and diseases. There are several methods used for the removal of heavy metals from aqueous solution [1][2][3][4]. However, among the several methods, adsorption method is found to be more effective for the removal of heavy metals.…”

Effect of pH and chloride concentration on the removal of hexavalent chromium in a batch electrocoagulation reactor

“…tion [12], biosorption [13][14][15], membrane separation [16][17][18] and electrochemical methods [3,[19][20][21][22]. Electrochemical based methods allow controlled and rapid reactions, smaller systems become viable and, instead of using chemicals and micro-organisms, the systems employ only electrons to facilitate water treatment.…”