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An executive review of sludge pretreatment by sonication

Journal of Environmental Sciences 2015年第11期27卷 139-153页

作者： Ngoc Tuan Le carine julcour-lebigue Henri Delmas University of Science Vietnam National University Université de Toulouse Laboratoire de Génie Chimique

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 *** 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.

关键词： Ultrasonic pretreatment Waste activated sludge Sludge disintegration Acoustic frequency Intensity effect Pressure effect

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Effect of External Pressure on the Efficacy of Ultrasonic Pretreatment of Sludge

Effect of External Pressure on the Efficacy of Ultrasonic Pr...

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2012 2nd International Conference on Biotechnology and Environment Management

作者： Ngoc Tuan LE Berthe RATSIMBA carine julcour-lebigue Henri DELMAS Université de Toulouse Laboratoire de Génie ChimiqueINP-ENSIACET31030 ToulouseFrance

The objective of this work was to optimize the ultrasonic（US） pretreatment of sludge,which is known to enhance sludge disintegration and to facilitate anaerobic *** main parameters related to the processing efficiency were varied for this purpose:total solids content of sludge（TS）,thermal operating conditions（adiabatic ***）,specific energy input（ES）,and for the first time external *** different TS concentrations of sludge（12-36 g/L） were tested with different values of ES（7000-75000 kJ/kgTS） and 28 g/L was found as the optimum value according to the soluble chemical oxygen demand in the liquid phase（SCOD）.The effect of external pressure was investigated in the range of 1-16 bar under controlled temperature（28°C）:an optimum pressure of 2 bar was found at all the ES values,which improved sludge disintegration efficacy（DDCOD） by 22 to 67% compared to that at atmospheric *** particle diameter（D[4,3]） decreased from 408 μm to about 95-100 μm regardless of the conditions,and this size reduction was much faster than COD ***,different thermal operating conditions,with and without temperature control,proved adiabatic US to be more efficient than isothermal US with again an optimal pressure of 2 bar.

关键词： Mixed sludge Ultrasonic pretreatment External pressure Disintegration of sludge

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