超声破解剩余污泥的研究

Study on Excess Sludge Disintegration by Ultrasonic Treatment

通过混合水平有交互作用的正交试验，考察超声时间、超声频率、超声功率和超声脉冲比及超声时间与频率、时间与功率和功率与频率因素间交互作用对剩余污泥超声破解效果的影响．研究结果表明：超声破解污泥的最佳参数组合为超声时间7min，超声频率20kHz，超声功率600W，超声脉冲比3：1；3个因素间的交互作用不明显．考察超声破解7个不同MLSS（混合液悬浮固体浓度）污泥的情况，当适当提高污泥浓度时破解效果更佳；考察超声破解污泥时间曲线，超声破解污泥40min后各指标的破解率增加缓慢，在15—20min时超声破解污泥的能量利用率最高．

The influences of ultrasonic time, ultrasonic frequency, ultrasonic power, ultrasonic pulse ratio, along with the interaction between ultrasonic time and frequency, time and power, power and frequency factors on the ultrasonic disintegration effect of excess sludge were studied by orthogonal test of mixed-level interaction. The results show that the optimal combination parameters of the ultrasonic disintegration sludge list as the ultrasonic time of 7 minutes, the ultrasonic frequency of 20 kHz, the ultrasonic power of 600 W, the ultrasonic pulse ratio of 3： 1, and the interaction effects among the three factors of the four are not obvious. It is found that appropriately improving the sludge concentration would gain a better disintegration effect after studying the seven different solid concentration liquor suspended sludge disintegrated by ultrasonic. The time curves of ultrasonic disintegration sludge indicate that the disintegrating rate of each index increases slowly when the sludge is disintegrated after 40 minutes, and the highest energy utilization of ultrasonic disintegration sludge appears during 15 to 20 minutes.