An executive review of sludge pretreatment by sonication

Ultrasonication（US）, which creates hydro-mechanical shear forces in cavitation, is an advanced technology in sludge pretreatment. However, there are many factors affecting the efficacy of cavitation and ultrasonication disintegration of sludge as a consequence.The objective of this work is to presen...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2015-11, Vol.37 (11), p.139-153
Main Authors: Le, Ngoc Tuan, Julcour-Lebigue, Carine, Delmas, Henri
Format: Article
Language:English
Subjects:
Acoustic frequency
Animals
Chemical engineering
Chemical Sciences
Intensity effect
Pressure effect
Sewage - chemistry
Sewage - microbiology
Sludge disintegration
Sonication - methods
Ultrasonic pretreatment
Waste activated sludge
Waste Management - methods
声波特性
实验室规模
审查
污泥特性
污泥预处理
评价方法
超声处理
预处理技术
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Summary:Ultrasonication（US）, which creates hydro-mechanical shear forces in cavitation, is an advanced technology in sludge pretreatment. However, there are many factors affecting the efficacy of cavitation and ultrasonication disintegration of sludge as a consequence.The objective of this work is to present an extensive review of evaluation approaches of sludge US pretreatment efficiency. Besides, optimization methodologies of related parameters,the differences of optimum values and the similarities of affecting trends on cavitation and sludge pretreatment efficiency were specifically pointed out, including ambient conditions,ultrasonic properties, and sludge characteristics. The research is a prerequisite for optimization of sludge US pretreatment efficiency in lab-scale and practical application. There is not-yet a comprehensive method to evaluate the efficiency of sludge US pretreatment, but some main parameters commonly used for this purpose are degree of sludge disintegration, proteins,particle size reduction, etc. Regarding US parameters, power input PUS, intensity IUS, and frequency FSseem to have significant effects. However, the magnitude of the effect of PUSand probe size in terms of IUShas not been clearly detailed. Investigating very low FSseems interesting but has not yet been taken into consideration. In addition, static pressure effect has been marginally studied only and investigation on the effect of pH prior to US process has been restricted. Their effects therefore should be varied separately and simultaneously with other related parameters, i.e. process conditions, ultrasonic properties, and sludge characteristics, to optimize sludge US pretreatment process.
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2015.05.031