Abstract:

In order to study the removal rates of the COD and NH3-N of pharmaceutical wastewater with the separate ultrasonic degradation, coagulation and combined two treatments, the removal rates of the COD and NH3-N with ultrasonic radiation time, power and coagulant species were studied. The results showed that: (1) the removal rates of the COD and NH3-N of the pharmaceutical wastewater by ultrasonic increased at the beginning and then finally tended to be decreased. In regard to the removal rates of COD and NH3-N, the best treatment time was 1000 s, the removal rates of COD and NH3-N were 27.80% and 45.34%, separately. When ultrasonic radiation time was 1000 s, he removal rates of the COD and NH3-N of the pharmaceutical wastewater by ultrasonic power increased at the beginning and then decreased. (2) The removal rates of COD and NH3-N of the pharmaceutical wastewater by coagulation (0.1-0.6 g/L) increased at the beginning and then decreased. The best treatment was 0.3 g/L of PAC. The removal rates of COD was 40.10% ,but the average removal rates of the NH3-N is about 5%. (3) In the most condition, ultrasonic treatment then combined with coagulant was better than coagulant then combined with ultrasonic treatment, the removal rates of COD and NH3-N were 61.2% and 58.6%, separately. Removal rates of COD and NH3-N with ultrasonic treatment, then combined with coagulant was better than coagulation then combined with ultrasonic treatment.