[Enhancement effect of low intensity ultrasound on biological wastewater treatment system in low temperature and design of application on biological wastewater treatment].
This work aims to study the enhancement effects of low intensity ultrasound on biological wastewater treatment in low temperature. The activated sludge was irradiated by ultrasound with intensity of 0.3 W cm(-2) for 10 minutes, and then simulated SBR process in 4 degrees C. Oxygen uptake rate (OUR), dehydrogenase activity (DHA) and COD were determined to indicate the changes of sludge activity and the removal rate of organic matter after the ultrasonic irradiation in low temperature. Results showed that after ultrasonic enhancement, the sludge activity could be increased by 30%, and COD removal rate could keep the usual level as in the room temperature. Furthermore, the enhancement effect of ultrasonic irradiation was more significant in the low temperature than that in the room temperature. This paper also took the typical municipal wastewater secondary treatment technology and SBR technology as examples to illustrate the design and operation of the enhancement of biological wastewater treatment using low intensity ultrasound.
Liu
Hong
H
Bioengineering Department of Beihang University, Beijing 100083, China. LH64@buaa.edu.cn
Yan
Yi-Xin
YX
D001420:Bacteria, Aerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D013696:Temperature; D014465:Ultrasonics; D014865:Waste Disposal, Fluid / Q000379:methods*