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Cleaning Oily Sludge Using Colloidal Gas Aphrons: Optimizing Process Conditions and Analyzing Mechanisms
Hongyang Ren1,2, Yongting Wu1, Jiajian Shang3
1School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 25, 2024
Summary
Colloidal gas aphrons (CGAs) offer superior oil removal from oily sludge compared to chemical treatments. These stable microbubbles enhance pollutant removal through increased surface area and specific adsorption mechanisms.
Area of Science:
- Environmental Science and Engineering
- Colloid and Surface Chemistry
Background:
- Colloidal gas aphrons (CGAs) possess large specific surface areas and high surface activity, making them suitable for pollutant removal.
- Oily sludge presents environmental challenges due to persistent oil contamination.
Purpose of the Study:
- To investigate the structure and properties of CGAs for oil removal from oily sludge.
- To optimize CGA treatment conditions and elucidate the underlying removal mechanisms.
Main Methods:
- Preparation and characterization of CGAs, including liquid film thickness and interfacial tension measurements.
- Optimization of oil removal conditions using response surface methodology.
- Investigation of CGA behavior and pollutant interaction using inverted fluorescence microscopy, SEM, FTIR, and 2D fluorescence spectroscopy.
Main Results:
- Prepared CGAs exhibited high stability with a liquid film thickness of 5-10 μm and low interfacial tension (3.157 mN/m).
- CGA treatment achieved a significantly higher oil removal rate than chemical treatments, reaching 96.07% under optimal conditions.
- Surfactant concentration and temperature were identified as the most significant factors influencing oil removal.
Conclusions:
- CGAs effectively enhance oil removal by increasing mass transfer surface area and providing pollutant attachment sites.
- Pollutants undergo liquid membrane solubilization, transferring to the inside of the CGA liquid film.
- CGAs specifically adsorb negatively charged organic compounds and aromatic hydrocarbons via electrostatic and hydrophobic interactions, facilitating pollutant migration.
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