title: Effect of low power ultrasound on aerobic/anoxic digestion of activated sludge.
abstract: The effect of low power ultrasound on aerobic/anoxic digestion of activated sludge was investigated. First, dehydrogenate activity (DHA) and special oxygen uptake rate (SOUR) were detected to indicate the change of biological activity of sludge induced by ultrasound. Single-factor experiments showed that when the ultrasonic frequency was 28 kHz, the optimal ultrasonic density and exposure time were 0.15 W/mL and 10 min, respectively. Through orthogonal tests, the optimal ultrasonic parameters for aerobic/anoxic digestion were found to be a ultrasonic density of 0.15 W/mL, ultrasonic exposure time of 10 min and interval time of 12 h. The aerobic/anoxic digestion was improved by ultrasonic pretreatment, the VSS reduction at the optimal conditions was increased by 35.73%, compared with the control. It can be concluded that low power ultrasonic pretreatment is a valid method for improving aerobic/anoxic biodegradability of activated sludge.
authors.affiliation: Guangdong University of Technology, Guangzhou, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Li
authors.forename: Sun
authors.initials: S
authors.lastname: Shuiyu
authors.forename: Xu
authors.initials: X
authors.lastname: Yanbin
authors.forename: Yao
authors.initials: Y
authors.lastname: Weiting
authors.forename: Tong
authors.initials: T
authors.lastname: Wenjin
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D010088:Oxidoreductases / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors; D014465:Ultrasonics
chemical_list: D012722:Sewage; D010088:Oxidoreductases; D010100:Oxygen