超声波破碎联合ClO_2氧化污泥的效能研究

A study of sludge treatment efficiency by ultrasonic disintegration combined with ClO_2 oxidation

采用先超声波对取自SBR的剩余污泥进行物理破碎,然后投加ClO_2进行化学氧化溶胞破解污泥,通过单因素试验考察主要影响因素对污泥破解效果的影响;通过正交试验研究超声波联合ClO_2对剩余污泥细胞破解的效率,得出各主要因素的影响规律及最佳污泥破解条件。结果表明,污泥上清液各相关指标的变化幅度与声能密度、ClO_2投加量正相关,但随着时间的延长及ClO_2投加量的增加,变化幅度趋缓。最佳处理条件为:超声波声能密度为1.0 W/m L,作用时间为6 min,ClO_2投加量为6 mg/g[干泥],能使SCOD增幅达2 213%,TN增幅达203.67%,TP增幅达827.08%,MLSS减幅达6.48%。

Excess sludge from SBR was disintegrated firstly by ultrasonic, and then was treated by lysis process based on chemical oxidation with ClO2added. The main factors influencing sludge disintegration were investigated by single factor test; besides, the effect of the combined process of ultrasonic disintegration and ClO2 oxidation on excess sludge disintegration efficiency was studied through orthogonal test, the influencing rules of the main factors and the optimal condition for sludge disintegration were finally determined. The results showed that, there was a positive correlation among rangeability of indexes of supernatant liquid, energy density of sound and ClO2 dosage, however, with the extension of reaction time and the increasing of ClO2dosage, the indexes variation was slow down. Under the optimal treatment condition that： the sound energy density of ultrasonic was 1.0 W/mL, the reaction time was 6 min, the dosage of ClO2 was 6 mg/g（dry sludge）, the growing rates of SCOD, TN and TP were 2 213%, 203.67% and 827.08% respectively; the decreasing rate of MLSS was 6.48%.