An executive review of sludge pretreatment by sonication

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• 作者：Ngoc Tuan Le¹ ; ² ; ^{lntuan@hcmus.edu.vn" class="auth_mail" title="E-mail the corresponding author} ; Carine Julcour-Lebigue² ; Henri Delmas²
• 关键词：Ultrasonic pretreatment ; Waste activated sludge ; Sludge disintegration ; Acoustic frequency ; Intensity effect ; Pressure effect
• 刊名：Journal of Environmental Sciences
• 出版年：2015
• 出版时间：1 November 2015
• 年：2015
• 卷：37
• 期：Complete
• 页码：139-153
• 全文大小：1070 K

文摘

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 P_US, intensity I_US, and frequency F_S seem to have significant effects. However, the magnitude of the effect of P_US and probe size in terms of I_US has not been clearly detailed. Investigating very low F_S seems 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.