DEVELOPMENT OF NOVEL WATER TREATMENT PROCESSES USING MULTI-ELECTRODE SYSTEM

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Three novel processes for the treatments of heavy metal (Cu^<2+>) ion, nitrate, and phosphorous compounds, respectively, were proposed and their performances were studied experimentally and theoretically.In the process for heavy metal ion removal, it was found that removal efficiency of a model metal ion (Cu^<2+>) was enhanced comparing with former electrolytic process, because electric current was effectively utilized for the metal reduction on the cathode surface (i.e. Cu^<2+> to Cu) in the multi-electrode system. This enhanced performance is attributable to smaller electric current density below limiting current density. Furthermore, it was shown that the multi-electrode system consisting of GAC also increased bio-electrochemical denitrification rate several times, in comparison with former BER studies.Moreover, the multi-electrode system was successfully applied to a novel phosphorous removal process, where phosphorus precipitation occurred with no addition of chemicals and was facilitated by a unique alkaline zone-formation in the multi-electrode system. This invention was applied as domestic, US and EU patents.