Water Purification To Remove As(V) by Electropulse Treatment of an Active Metallic Charge

Abstract

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.

Arsenite removal from groundwater by aerated electrocoagulation reactor with Al ball electrodes: Human health risk assessment

“…In this case, the adsorption capacity for As(III) and As(V) were calculated as 15.7 mg g À1 at pH 6.5e9.5 and 75.7 mg g À1 at pH 2e5 for amorphous Al oxide and 63.7e89.9 mg g À1 at pH 7.9 and 63.7e30.5 mg g À1 at pH 4e9 for amorphous Fe oxide, respectively (Goldberg and Johnston, 2001). At the specific surface area of the forming iron oxides equal to 105 m 2 g À1 , the adsorption values for As(III) and As(V) were 96.1 and 156.7 mg g À1 , respectively (Danilenko et al, 2005). Adsorption capacity of Al 2 O 3 was 0.40e38.8 mg g À1 for As(III) and 0.5e121.4 mg g À1 at pH 7 (Maiti, 2012).…”

“…( 12)) was released (Kuan et al, 2009). Danilenko et al (2005) indicated that As(III) in EC process is partially oxidized to As(V) in the case of using Al anodes. As(III) and As(V) removals in model solutions after an EC process were 95% and 86.3% for Al electrode and 100% and 100% for Fe electrode at electrolysis time of 30 s and current of 400 A.…”

Analytical Nonlinear-Probabilistic Model of the Equivalent Electrical Resistance of a Layer of Metal Granules

“…До другої -іскрове плазмове або електророзрядне спікання під тиском мікророзмірних порошків металів і сплавів в композитах, кераміках та інших гетерогенних середовищах [13]. До третьої -виробництво гідроксидів, утворюючих коагулянт металів (Al та Fe) для очищення [14,15] і знезараження [16] природних вод та промислових скидів. До четвертої -виробництво стійких до седиментації нанодисперсних гідрозолей біологічно активних металів (Ag, Cu, Zn, Fe, Mg, Mn, Mo, Co) [17] для застосування у рослинництві [18] і тваринництві [19].…”