Dimensional Stable Anode Preparation, Characterization And Combination With Active Carbon As Three-dimensional Electrochemical Treatment On Wastewater

Environmental disturbance is increasingly severe as a result of humanbeings' distruction. And it is urgent that environmental pollution problems are solved.So they also become one of the hot focuses in the scientific research fields. In the recentyears, the utility of electrochemical oxidation for wastewater treatment has become anew method. This paper is referred to disposal of wastewater through three-dimensionalelectrodes based on the catalytic electrode.In the first Part of the dissertation, the fundamental knowledge of treatment onaquatic environmental contamination by physical method, chemical means,physics-chemical way and biological way was brieflYintroduced. Then, it was reviewedthat many kinds of electrochemical processes were used on the wastewater treatment,especially it was emphasized that three-dimensional electrodes and Dimensional StableAnode (DSA) electrode were applied on disposal of wastewater. The content of thissubject study was presented on the basis of studies.The second part of this dissertation presents TG and XRD analysis about DSAelectrode material components. These DSA electrode interlayers and outerlayersprepared on different temperature were characterized by scanning electron micrograph(SEM), and their electrochemical properties were analysed by cyclic voltammetricinstrument. The results show that the lowest temperature of DSA interlayer andouterlayer preparation is 650℃. Through SEM analysis, interlayer prepared on 550℃isquite compact. Interlayer prepared on 650℃is less compact, and 750℃and 850℃,loose. There is few porous structure and flute on the outlayer prepared on 600℃. Theflocculent and porous structures which distribute evenly appear on outlayer prepared on700℃. But there are racemose crystal particles distributed unevenly whose diameter isvarious on the outlayer prepared on 800℃. Through cyclic voltammetric analysis,oxygen evolution potential at DSA anode prepared on 700℃is highest. At last, it waspresented that interlayers and outerlayers prepared under the different temperaturesinfluence DSA electrode' lifetime and catalysis property. The results show that thelifetime and the catalysis of DSA anode with the interlayer under 650℃and the outerlayer under 700℃were best.The third part of this dissertation introduces electrochemical degradation processesin which sodium dodecyl benzene sulfonate (DBS) anionic surfactants and syntheticpaper mill wastewater were treated combining DSA electrode as anode and graphiteelectrode as cathode with active carbon particles serving as particle electrodes under theinfluence of electric field. Instantaneous current efficiency (ICE), electrochemicaloxidation index (EOI) and energy consumption was calculated in the electrolysisprocesses. And pH and current density's influences on the whole system were studied.At last, the working mechanism about the three dimensional electrodes with DSA anodewas illustrated, and the treatment processes were simulated with first pseudo-first orderkinetic equations.In the research, an electro-catalytic DSA electrode with complex interlayer wasprepared. Its stability and catalysis are satisfied, and better effect is achieved when it iscombined with active carbon.