Electrochemical degradation of tridecane dicarboxylic acid wastewater with tantalum-based diamond film electrode

Tantalum-based diamond film electrode is found having wider potential window and better catalyzingoxidation efficiency by testing its electrochemical performance. By examining electrochemical degradation performance of tridecane dicarboxylic acid organic wastewater on these electrodes, the effect of various technique conditions on the COD removal, including potential, electrolysis time, the distance of two electrodes, pH value and with and without stirring, are investigated. The result shows that COD removal rate is 99% and meets the discharge standard of China. The specific electricity consumption is 6.4 kWh/kg COD. The proper technique conditions are 1.6 V potential, 7 h electrolysis, 20 mm distance of the two electrodes and pH value from 3 to 5.

By testing the performance of the diamond film electrode with cyclic voltammetry (CV), a wide potential window of this kind of electrode is found. So, it is propitious to the indirect oxidation of organic in wastewater and higher current efficiency is performed. Different electrolysis conditions are investigated. As a result, COD removal rate and specific electricity consumption are increasing with the cell voltage increasing and electrolysis time going on. Moreover, the distance of the two plates reducing, lower pH value and drastic stir will benefit to the degradation of the organic.