Сhemical Bases And Regimes Of Micro-Arc Wastewater Treatment

Abstract

The capabilities of various groups water treatment technologies analyzed using the coke plant wastewater example. Emphasis is placed on the electrochemical technologies extensive potential for removing organic and inorganic contaminants. The using prospects a micro-arc discharge in a packed-bed electrode medium for this purpose is shown. A interconnected physicochemical processes model occurring during micro-arc wastewater treatment is constructed, including plasma-, electro-, photo-, and thermochemical processes, secondary reactions, and adsorption. The secondary processes predominant role in wastewater treatment is substantiated. These processes are initiated by the active agents supply – radicals, molecular products, ions, and electrons – from the microdischarge channel into the solution, which, in contrast to individual micro-arcs, creates a volume-distributed rather than a point-distributed effect. Possible chemical transformation equations that may contribute to the coke plant effluent purification by this method are provided. It is noted that a microdischarges on an aluminum or coke bed electrode disperses the it material, forming an active suspension of amorphous particles. It was found that the Fe or Al dispersing produces a hydroxide-based ion-exchange coagulant, while the coke use yields a fine carbon sorbent; the coagulant enables the heavy metal ions removal, and the sorbent targets organic impurities. It is shown that the ratio between the overall purification mechanism components can be controlled by selecting the type and characteristics of the applied voltage, as well as the type and formation features of the bed electrode. Electrical power input modes for the micro-arc reactor are determined, defining the removing various pollutants efficiency in the different types bed electrodes presence.