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Power expenditure for water purification to remove arsenic(V) was determined. The processes and kinetics of purification in an electric-discharge reactor with a metallic (aluminum or iron) charge were investigated. The purification mechanisms based on the adsorption of arsenic(V) on a fresh surface of hydroxides formed through dispersion and subsequent oxidation of a charged metal were suggested. Rate equations corresponding to the experimental data and to these mechanisms were given.One of problems accompanying many commercial processes, especially those in the metallurgical industry, is effective removal of arsenic and other toxic elements from wastewater. Methods for arsenic removal from wastewater can be combined in two groups: those with and without reagents. The second group includes galvanocoagulation, electrocoagulation, and electropulse water purification.

The composition and formation kinetics of erosion products of the metallic charge (aluminum, iron) in an electric-discharge reactor operating at an open-circuit voltage of 500 31000 V, peak pulse current of 250 A, and pulse energy of 0.531 J were studied. Dispersion products of the charge were subjected to electron-microscopic and X-ray phase analyses. The energy yield of erosion products was determined by chemical analysis to be hundreds of times the calculated yields of electrolysis. The erosion kinetics was studied and the mechanism of erosion was considered.

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