不同预处理方式对剩余污泥破解率的影响

    Effect of Different Pretreatment Methods on Disruption Rate of Excess Sludge

    • 摘要: 为提高剩余污泥资源化利用率,本研究首先采用单因素试验法探究4种预处理方式对污泥破解率的影响,然后对比联合预处理的破解效果,确定最佳的联合预处理方式,通过光学显微镜对比观察破解前后剩余污泥的形貌变化,最后利用激光粒度分析仪测定污泥的粒径变化。结果表明:超声波、热水解、表面活性剂以及复合酶4种单独预处理中,超声波预处理对污泥的破解效果最好,在0.15 W/mL能量密度以及10.0 min超声时间下,污泥破解率为18.1%;表面活性剂预处理对污泥破解的效果最差,60 mg/g单位污泥总固体添加量下,污泥破解率仅为8.5%。相较于单独预处理,表面活性剂联合超声波预处理表现出协同作用,污泥破解率提高9.0%,污泥粒径减小45.5%~67.9%。

       

      Abstract: In order to enhance the utilization rate of excess sludge resources. In this study, the effects of four pretreatment methods on sludge disruption rate were investigated by single factor test. Subsequently the disruption effect of combined pretreatment was compared, and the best combined pretreatment method was determined. The morphological changes of excess sludge before and after disruption were observed by optical microscope. Finally, the change of sludge particle size was measured by laser particle size analyzer. The results showed that ultrasonic pretreatment had the best effect on sludge disruption among ultrasonic, thermal hydrolysis, surfactant and complex enzyme pretreatment. The sludge disruption rate was 18. 1% under 0. 15 W/mL energy density and 10. 0 min ultrasonic time. The surfactant pretreatment on sludge disruption has the least impact, and the sludge disruption rate was only 8. 5% at 60 mg/g addition. Compared to the single pretreatment, the surfactant combined with ultrasonic pretreatment exhibited a synergistic effect. The sludge disruption rate increased by 9. 0%, and the sludge particle size decreased by 45. 5%~67. 9%.

       

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