超声波破解剩余污泥的试验研究

Experimental study on excess sludge disintegration by ultrasonic treatment

利用超声波对剩余污泥进行破解,采用正交试验方法,选择超声时间、超声频率、超声功率和超声脉冲比作为试验因素,考察各因素对污泥破解效果的影响。选择破解后污泥上清液中溶解性化学需氧量(SCOD)、总磷(TP)、氨氮、硝氮、蛋白质、核酸和肽聚糖的质量浓度作为评价指标,分别采用综合平衡法和综合评分法进行分析,结果表明:超声波破解污泥的最佳参数组合为超声时间10 min,超声频率20 kHz,超声功率600 W,超声脉冲比2∶1;所考察的4个因素对污泥破解效果的影响顺序为超声时间>超声脉冲比>超声频率>超声功率;超声时间对肽聚糖质量浓度的影响非常显著,超声频率对肽聚糖质量浓度的影响显著,超声脉冲比对肽聚糖和总磷质量浓度影响显著。

Ultrasonic was used to disintegrate the excess sludge. An orthogonal experiment was carried out to investigate the influences of ultrasonic treatment time, ultrasonic frequency, ultrasonic power and ultrasonic pulse ratio on the disintegration effect. The mass concentrations of soluble chemical oxygen demand （SCOD）, total phosphorus （TP）, ammonia nitrogen, nitrate nitrogen, protein, nucleic acids and peptidoglycan in the supernatant of disintegrated sludge were selected as the evaluation indexes. The integrated balance method and the comprehensive evaluation method were used as the analysis methods. The results show that the optimum operational parameters are as follows ： ultrasonic treatment time 10 min, ultrasonic frequency 20 kHz, ultrasonic power 600 W and ultrasonic pulse ratio 2 ： 1. Ultrasonic treatment time is observed to have the largest influence on the sludge disintegration effect, followed by ultrasonic pulse ratio, ultrasonic frequency and ultrasonic power. Ultrasonic treatment time has very significant influence on the mass concentration of peptidoglycan in the supernatant of disintegrated sludge; ultrasonic frequency has significant influence on peptidoglycan; ultrasonic pulse ratio has significant influence on the mass concentrations of peptidoglycan and TP.