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An energy-efficient solution to sludge drying and combustion process through Camellia oleifera shells amended foaming
Cheng Zhao1, Jing Huang2, Zhaohui Yang3
1School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, 410076, PR China; State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha, Hunan, 410004, PR China.
Journal of Environmental Management
|February 28, 2024
Summary
Camellia oleifera shells (COS) improve sludge foaming pretreatment, significantly reducing drying time and energy consumption. This biomass additive enhances sludge properties for efficient treatment and disposal.
Area of Science:
- Environmental Engineering
- Materials Science
Background:
- Foaming pretreatment enhances sludge drying, but efficiency varies with sludge properties.
- Solid particles inspire the use of biomass as foam stabilizers.
Purpose of the Study:
- To investigate Camellia oleifera shells (COS) as a CaO additive for promoting sludge foaming.
- To analyze the impact of COS on sludge drying behavior, surface characteristics, combustion, and energy consumption.
Main Methods:
- Sludge foaming with CaO and varying COS concentrations.
- Analysis of drying curves, surface crack morphology (multifractal spectra), and combustion performance.
- Evaluation of energy consumption during foaming, drying, and combustion.
Main Results:
- Addition of 3.0 wt% COS saved 46.72-50.10% of foaming time and 53.14% of drying time.
- COS enhanced surface crack complexity, improving moisture diffusion and heat transfer.
- Sludge foamed with COS showed improved combustion performance and reduced activation energy.
Conclusions:
- COS effectively promotes sludge foaming and drying, offering significant time and energy savings.
- This method presents an energy-efficient solution for sludge treatment and disposal.
