Removal of Ceftazidime from Aqueous Solution Using Biofilm Process Enhanced by External Electric Field
The study discussed the respective treatment effects of biofilm process enhanced by external electric field and traditional biofilm process on ceftazidime in aqueous solution. The result demonstrated the treatment indicators of biofilm reactor enhanced by external electric field(R2) achieved the best, including total nitrogen(TN), COD and ammonia nitrogen(AN), when the influent loading was 3 kg/(m3·d), the reaction period was 8 hours and pH was 8. The average removal rate of ceftazidime in R2 was 90.76%, while the rate of the traditional biofilm reactor(R1) was only 80.63%. It was obvious the R2 showed a higher removal rate, a better stability and a stronger anti-shock loading capability than R1. The bacillus was the dominant microorganism species in the both reactors. The growth of bacteria was inhibited and the species changed when the concentration of ceftazidime was 3.5 mg/L in R1, while the microorganism of R2 growed stably under a higher concentration of ceftazidime, thus showing a better treatment effect. The data simulation exhibited the MONOD model could well explained this process. The specific degradation rates(v) of ceftazidime in both reactors were increased with the ceftazidime concentration increasing, and the increasing rate of R2 was greater than that of R1.