Optimized preparation of iridium-tantalum coated electrodes for black water treatment in rural toilets and its effect on chlorine evolution performance
Black and odorous sewage of rural toilets is commonly treated by biological methods,which suffer from unstable treatment efficiency and complicated operation management.In this study,an iridium-tantalum coated series electrode(Tx)and an iridium-tantalum tin-antimony-cobalt coated series electrode(Cx)were successfully constructed by optimizing the preparation of traditional titanium-iridium electrodes.The oxidative degradation of organic matter and simultaneous removal of ammonia nitrogen were achieved using electrochemical in situ chlorine production.By optimizing the formulation of the electrode composite oxide coating,it was found that the fully sprayed T3 electrode(IrTa oxide coating 0.6 mg·cm-2,Ti oxide coating 0.75 mg·cm-2)exhibited the highest water purification efficiency under a working voltage of 2.4 V,removing 50％of the COD from rural black water within 60 minutes.The surface cleaning process and sintering process were systematically studied on the chlorine production efficiency of the electrode,and it was found that the T3 electrode constructed by sand blasting combined with acid cleaning surface cleaning process,roller coating fixed process,and sintering process at 500 ℃ had the highest chlorine production efficiency and enhanced service life.This study provides a feasible solution for the eutrophication problem of decentralized sewage discharge.
coated electrodesammonia nitrogenchlorine evolution reactionblack and odorous sewage
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