Electro-Catalysis Degradation of Desorbed Concentrated Organic Solution with Titanium-Based PbO₂ Anode

Commercial PbO₂ electrode was adopted as the anode for the electro-catalysis degradation of concentrated organic solution from an actual desorption process of centralized sewage treatment plant. The influences of different factors on the degradation and energy consumption were considered. The results indicate that the increase of current density could promote the COD removal and increase the BOD₅-to-COD ratio for the treated concentrated solution, hence increasing the bio-degradability. However, the increase of current density also leads to an obvious increase of unit energy consumption and a decrease of current efficiency. When the current density is 0.1 A/cm², the BOD₅-to-COD ratio of the treated concentrated solution is 0.63, which means it is feasible to use the biodegradation method to treat the remaining solution. The elongation of electrolysis time improves the COD removal efficiency and the unit energy consumption, but decreases the current efficiency and BOD₅-to-COD ratio. So the electrolysis time in practice should be optimized. When the electrode area is fixed, the treatment efficiency decreases with the volume of treated solution. Thus, the electrode area and treated solution volume should be optimized according to practical situation.