Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
Department of Civil Engineering, Thiagarajar College of Engineering, Madurai, India.
Ultrason Sonochem. 2015 Sep;26:241-248. doi: 10.1016/j.ultsonch.2015.01.015. Epub 2015 Jan 21.
In this study, ultrasonication was used for sludge deflocculation, followed by cell disintegration using ozone. The effect of this phase separated sono-ozone pretreatment is evaluated based on extra polymeric substances release, deoxyribonucleic acid (DNA) in the medium, solubilization of intra cellular components and suspended solids (SS) reduction. Ultrasonically induced deflocculation was optimized at an energy dosage of 76.4(log 1.88)kJ/kg TS. During cell disintegration (ozone dosage 0.0011 mgO3/mgSS), chemical oxygen demand solubilization (COD) and SS reduction of sonic mediated ozone pretreated sludge were 25.4% and 17.8% comparatively higher than ozone pretreated sludge, respectively. Further, biogas production potential of control (raw), flocculated (ozone pretreated), and deflocculated (sonic mediated ozone pretreated) sludges were observed to be 0.202, 0.535 and 0.637 L/(gVS), respectively. Thus, the phase separated pretreatment at lower ultrasonic specific energy and low dose ozone proved to enhance the anaerobic biodegradability efficiently.
在本研究中，采用超声法对污泥进行解絮，然后用臭氧进行细胞破碎。根据释放的胞外聚合物、介质中的脱氧核糖核酸 (DNA)、细胞内成分的溶解以及悬浮固体 (SS) 的减少来评估这种分相超声-臭氧预处理的效果。在能量剂量为 76.4(log 1.88)kJ/kg TS 时，优化了超声诱导的解絮作用。在细胞破碎（臭氧剂量 0.0011 mgO3/mgSS）过程中，与臭氧预处理污泥相比，经超声介导臭氧预处理的污泥的化学需氧量溶解（COD）和 SS 减少率分别高 25.4%和 17.8%。此外，观察到对照（原）、絮凝（臭氧预处理）和解絮（超声介导臭氧预处理）污泥的生物气产生潜力分别为 0.202、0.535 和 0.637 L/(gVS)。因此，在较低的超声比能和低剂量臭氧下进行分相预处理，可有效地提高厌氧生物降解性。
