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Ultrasonic sludge pretreatment under pressure.

Ngoc Tuan Le¹, Carine Julcour-Lebigue, Henri Delmas

¹Université de Toulouse, Laboratoire de Génie Chimique, INP-ENSIACET, 31030 Toulouse, France. ngoctuan.le@ensiacet.fr

Ultrasonics Sonochemistry

|April 17, 2013

Summary

Optimizing ultrasound pretreatment of sewage sludge involves adjusting parameters like solid content and pressure. External pressure of 2 bar significantly enhances sludge disintegration and particle size reduction, improving efficiency.

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Area of Science:

Environmental Engineering
Chemical Engineering
Applied Physics

Background:

Sewage sludge pretreatment is crucial for efficient waste management and resource recovery.
Ultrasound pretreatment offers a promising method for sludge disintegration.

Purpose of the Study:

To optimize ultrasound (US) pretreatment parameters for various sewage sludge types.
To investigate the impact of external pressure on US sludge disintegration.

Main Methods:

Parametric study involving stirrer speed, total solid content (TS), thermal conditions (adiabatic/isothermal), ultrasonic power input (PUS), specific energy input (ES), and external pressure.
Analysis of solubilized chemical oxygen demand (SCOD) and mean particle diameter (D[4,3]).

Main Results:

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Optimum TS concentration found at 28 g/L for mixed sludge.
Adiabatic conditions and "high power input - short duration" procedure enhanced SCOD.
An optimal external pressure of approximately 2 bar was identified, improving disintegration efficacy by 22-67% (mixed sludge) and 26-37% (secondary sludge).
Mean particle diameter significantly reduced across all sludge types.

Conclusions:

Ultrasound pretreatment is effective for sludge disintegration and particle size reduction.
External pressure is a key parameter for optimizing US pretreatment efficiency.
The findings provide valuable insights for industrial sludge treatment processes.