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Optimisation of sludge pretreatment by low frequency sonication under pressure
Ngoc Tuan Le1, Carine Julcour-Lebigue2, Laurie Barthe2
1Université de Toulouse, Laboratoire de Génie Chimique, INP-ENSIACET, 31030 Toulouse, France; University of Science, Vietnam National University, Ho Chi Minh City, Viet Nam.
Journal of Environmental Management
|October 5, 2015
Summary
Optimizing sludge pretreatment using non-isothermal sonication involves adjusting ultrasound power, frequency, and pressure. Sequential sonication at 12 kHz with specific parameters yielded the best sludge disintegration.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Acoustics
Background:
- Sludge pretreatment is crucial for efficient waste management.
- Non-isothermal sonication offers a promising approach for sludge solubilization.
- Understanding the interplay of ultrasound parameters and temperature is key.
Purpose of the Study:
- To optimize sludge pretreatment using non-isothermal sonication.
- To investigate the effects of varying frequency, ultrasound power, intensity, pressure, and operation mode.
- To determine optimal conditions for sludge disintegration.
Main Methods:
- Non-isothermal sonication experiments were conducted.
- Variables included frequency (12 kHz vs. 20 kHz), ultrasound power (PUS), intensity (IUS), hydrostatic pressure, and operation mode (continuous vs. sequential).
- Sludge disintegration and temperature evolution were monitored.
Main Results:
- Higher PUS and lower sonication time improved sludge disintegration for a given energy input.
- Applying hydrostatic pressure significantly enhanced ultrasound (US) effects.
- 12 kHz consistently outperformed 20 kHz.
- Optimal pressure was dependent on PUS, IUS, and temperature.
- Sequential sonication (5 min US-on at 360 W, 12 kHz, 3.25 bar; 30 min US-off) provided the best sludge disintegration while managing temperature.
Conclusions:
- Non-isothermal sonication is effective for sludge pretreatment.
- Optimized sequential sonication parameters enhance sludge disintegration.
- Hydrostatic pressure and lower frequencies are beneficial for sonication efficiency.
Keywords:
Audible frequencyHydrostatic pressurePulsed ultrasoundSequential processSludge disintegration
