Electrochemical Treatment Characteristics of Insoluble Anode Electrode By Surface Morphology

Abstract

The sewage and wastewater treatment market has evolved from organic matter removal to advanced treatment and high reuse markets, and has developed into a treatment system that covers toxic control and optimal treatment of non-degradable materials. The importance of advanced treatment of sewage and wastewater treatment facilities is increasing, and the additional cost of sludge disposal becomes an important economic factor in the operation of sewage treatment plants. Moreover, as marine dumping of organic wastes has been banned since 2013, it is urgent to reduce the amount of sludge generated due to land treatment. In order to reduce the amount of sludge generated, volume reduction of the sludge is absolutely necessary, and dewaterability of the sludge is essential for volume reduction of the sludge. Dewaterability of sludge generally depends largely on the physical and chemical properties of the sludge, such as the charge of the particles of the sludge, the content of bound water, the content of solids and organics, the size and mechanical strength of the particles, porosity, and compression coefficient. In addition, conditions such as the type of modifier and dehydration pressure and speed are greatly affected. The free water present in the sludge can be discharged to the outside relatively easily, but it is insufficient to remove the bond by being present in the capillaries inside the sludge or by binding to substances in the sludge cells. Therefore, in this study, to solve the shortcomings of IrO2 and Pt electrodes, which are industrially insoluble anode electrodes, boron-doped diamond (BDD) was selected to study the dehydration efficiency of the dewatered sludge cake and the treatment characteristics of refractory organics.BDD electrodes with excellent mechanical properties, non-toxicity, and a wide potential window were deposited by HFCVD on Ti substrates with interlayers and Nb substrates for characterization according to the substrates. The surface morphology of the BDD electrode was controlled through the pressure during deposition, and a comparative study of the treatment properties with the previously used IrO2 electrode was conducted. The sewage sludge dewatering cake exhibiting an initial water content of 80% was treated under 50V and 1 min conditions. Upon treatment, the IrO2 electrode exhibited a 5% removal rate, and the BDD electrode exhibited a 50-60% removal rate.