剩余活性污泥超声波破解的特性研究

通过7个0～26 000 kJ/kg TS超声能量水平进行活性污泥的破解研究。结果表明,在超声能量低于1 000 kJ/kg TS时,超声波轻微破坏了污泥絮体结构,破解效应较弱,而超声能量高于5 000 kJ/kg TS,污泥的破解效应显著增强,污泥中的SCOD、蛋白质含量、碳水化合物含量和无机氮含量随着超声能量的增加而显著增加,并与超声能量呈显著相关性,污泥的可生化性能得到改善。26 000 kJ/kg TS的超声能量破解污泥,使污泥中的碳水化合物、蛋白质、氨态氮和硝态氮含量分别增加了92%、97%、173%和55%,但SCOD的破解程度仅为25.3%,仍不能完全破解污泥,因而不是破解污泥的最佳能量。

Changes in Characteristics of Excess Activated Sludge with Ultrasound Conditioning

7 ultrasonic energy levels ranging from 0~26 000 kJ/kg TS were used to disintegrate excess sludge to investigate the changes in chemical characteristics.Results indicated that ultrasonication process slightly disrupted floc structure and disintegration effect was weak for ultrasound energy dosages lower than 1 000 kJ/kg TS,and destroyed easily floc structure and broke up cell walls for ultrasound energy dosages above 5 000 kJ/kg TS,as evidenced by increases in SCOD,EPS content and inorganic nitrogen.Effects were enhanced at higher applied sonication energies.Correlation analysis showed that many of the changes were directly dependent upon the amount of ultrasonic energy applied.Ultrasonication can significantly change chemical characteristics of sludge.Sonication at the dose of 26 000 kJ/kg TS increased COD disintegration degree of 25.3% only,comparing the untreated sludge.Thus SCOD analysis indicated that an ultrasound energy of 26 000 kJ/kg TS was suboptimal for thoroughly disintegrating sludge,and as this corresponded to the highest energy examined in the study,an optimal value was never identified.