Scale effect of electrochemical oxidation reactor on the degradation of antibiotic simulated wastewater
The size of reactor has a significant impact on the efficiency of wastewater treatment,which is the key to the application of wastewater treatment from laboratory small reactors to actual medium and large reactors.This study established a size of 33.6 cm3(3 cm×8 cm× 1.4 cm)electrochemical reactor,with BDD(Boron Doped Diamond)electrode as anode,to conduct experimental test on the oxidative degradation of sulfamethazine(SMD).On the basis of measured data,the mathematical model of electrochemical oxidation reactor degrading SMD was established by using Computational fluid dynamics(CFD)software fluent,the electrochemical surface reaction rate under different current densities was calibrated,and the influence of reactor size on the distribution of pollutant flow characteristics and concentration characteristics was analyzed.The BDD anode area was magnified by 100 times,225 times and 400 times respectively by using CFD simulation,Explore the scale effect simulation under 3 working conditions.The results showed that the scale effect of the BDD system degradation reactor was significant.After 60 min at a current density of 20 mA·cm-2,the degradation rates of SMD in the three BDD anode systems were 72.7％,68.0％and 40.4％,respectively,which decreased by 5.7％,11.8％and 47.6％compared with the degradation capacity of the laboratory reactor.It was suggested that the reactor magnification should be less than 200 times to avoid significant impact on the degradation capacity.
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