Abstract: This research investigated degradation of oxytetracycline in wastewaterusing self-made sewage treatment device with multi-frequency ultrasonic. The ultrasonic frequency,power,ultrasonic time and titer four orthogonal factors' influence on oxytetracycline removal rate through the orthogonal experiment were evaluated. The influences of four different combinations of multi-frequency ultrasonic experiment on removal rates of oxytetracycline and COD were also studied. The results showed that the influencing factors were weighted as the following:ultrasonic frequency > ultrasonic time > titer > ultrasonic power. Ultrasonic frequency was very important in the degradation of oxytetracycline. Removal rates of both oxytetracycline and COD were higher under high-frequency combinations of multi-frequency ultrasonic. The degradation reached maximum when the multi-frequency combination was at 20kHz + 100kHz + 200kHz. Under this multi-frequency ultrasonic condition,the removal rate of oxytetracycline was close to 100% within 30 minutes and more than 90% of COD was removed within 60 at the processing volume of 40L.

Key words: multi-frequency ultrasonic device on sewage treatment, degradation, oxytetracycline, orthogonal experiment

摘要： 以抗生素土霉素为研究对象,采用自制复频超声波污水处理装置,通过正交实验探究超声频率、功率、超声作用时间和土霉素效价4个正交因子对去除率的影响,以及通过4组不同复频组合的超声实验,研究复频超声对土霉素去除率及COD去除率的影响.结果表明,各因素的影响权重:超声频率> 作用时间> 效价> 超声功率,超声频率对土霉素的降解起重要作用;高频复频组合条件下土霉素去除率和COD去除率比低频复频组合高,但高低频组合的复频20kHz+100kHz+200kHz条件下,土霉素去处效果最好;最佳复频组合条件下处理体积为40L的土霉素经30min复频超声作用,去除率接近100%,60 min COD去除率达90%以上.

关键词: 复频超声污水处理装置, 降解, 土霉素, 正交实验