DEVELOPMENT OF NOVEL WATER TREATMENT PROCESSES USING MULTI-ELECTRODE SYSTEM

提出了三种处理重金属离子(Cu^&lt；2+&gt；)离子、硝酸盐和含磷化合物的新工艺，并对其性能进行了实验和理论研究。在去除重金属离子的过程中，多电极系统中，由于电流被有效地用于阴极表面(即Cu^&lt；2+&gt；to Cu)的金属还原，使得一种典型的金属离子(Cu^&lt；2+&gt；)的去除效率比原电解法有所提高。这种增强的性能归因于低于极限电流密度的较小的电流密度。此外，与以往的BER研究相比，由GAC组成的多电极系统还可以提高生物电化学反硝化速率数倍，并且成功地将该多电极系统应用于一种新的除磷工艺中，该工艺无需添加任何化学物质即可发生磷沉淀，并通过在多电极系统中形成独特的碱性带来促进磷的析出。该发明被申请为国内、美国和欧盟专利。

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.