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Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water
https://orcid.org/0000-0001-9238-1928
https://orcid.org/0000-0003-1129-7172
https://orcid.org/0000-0002-3296-7051
Oily wastewater in the bilge of ocean vessels (i.e., bilge water) makes oil removal difficult due to the generation of oil-in-water (O/W) emulsions. A ship’s motion can promote emulsification or coalescence, depending on the surfactant type and concentration. This study investigates the effects of motion on model bilge water O/W emulsions, which has yet to be published in the literature. Mineral oil, 0.42 M NaCl DI-water, and a nonionic surfactant (Triton X-100) or an anionic surfactant (sodium lauryl ether sulfate, SLES) served as a model bilge water emulsion. The stability was characterized under static and dynamic conditions via optical microscopy and light diffraction. Ship motion was mimicked using a three-dimensional rocker. Under static conditions, the surfactant-to-oil ratio (S/O) needed to stabilize the emulsions for up to 20 days was 0.2 for SLES and 0.1 for Triton X-100. During dynamic ageing at 12 rpm, the S/O to promote emulsification was 0.1 for SLES and 0.2 for Triton X-100. At 30 rpm, the S/O to promote emulsification was 0.02 for SLES and 0.1 for Triton X-100, suggesting a complex interplay between surfactant concentration and energy input. These results expand on existing knowledge of bilge water and potentially reducing ocean pollution.
This work investigates the effect of ship rocking on emulsion stability to minimize the release of oil from oceanic vessels.
Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water
https://orcid.org/0000-0001-9238-1928
https://orcid.org/0000-0003-1129-7172
https://orcid.org/0000-0002-3296-7051
Oily wastewater in the bilge of ocean vessels (i.e., bilge water) makes oil removal difficult due to the generation of oil-in-water (O/W) emulsions. A ship’s motion can promote emulsification or coalescence, depending on the surfactant type and concentration. This study investigates the effects of motion on model bilge water O/W emulsions, which has yet to be published in the literature. Mineral oil, 0.42 M NaCl DI-water, and a nonionic surfactant (Triton X-100) or an anionic surfactant (sodium lauryl ether sulfate, SLES) served as a model bilge water emulsion. The stability was characterized under static and dynamic conditions via optical microscopy and light diffraction. Ship motion was mimicked using a three-dimensional rocker. Under static conditions, the surfactant-to-oil ratio (S/O) needed to stabilize the emulsions for up to 20 days was 0.2 for SLES and 0.1 for Triton X-100. During dynamic ageing at 12 rpm, the S/O to promote emulsification was 0.1 for SLES and 0.2 for Triton X-100. At 30 rpm, the S/O to promote emulsification was 0.02 for SLES and 0.1 for Triton X-100, suggesting a complex interplay between surfactant concentration and energy input. These results expand on existing knowledge of bilge water and potentially reducing ocean pollution.
This work investigates the effect of ship rocking on emulsion stability to minimize the release of oil from oceanic vessels.
Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water
https://orcid.org/0000-0001-9238-1928
https://orcid.org/0000-0003-1129-7172
https://orcid.org/0000-0002-3296-7051
Oily wastewater in the bilge of ocean vessels (i.e., bilge water) makes oil removal difficult due to the generation of oil-in-water (O/W) emulsions. A ship’s motion can promote emulsification or coalescence, depending on the surfactant type and concentration. This study investigates the effects of motion on model bilge water O/W emulsions, which has yet to be published in the literature. Mineral oil, 0.42 M NaCl DI-water, and a nonionic surfactant (Triton X-100) or an anionic surfactant (sodium lauryl ether sulfate, SLES) served as a model bilge water emulsion. The stability was characterized under static and dynamic conditions via optical microscopy and light diffraction. Ship motion was mimicked using a three-dimensional rocker. Under static conditions, the surfactant-to-oil ratio (S/O) needed to stabilize the emulsions for up to 20 days was 0.2 for SLES and 0.1 for Triton X-100. During dynamic ageing at 12 rpm, the S/O to promote emulsification was 0.1 for SLES and 0.2 for Triton X-100. At 30 rpm, the S/O to promote emulsification was 0.02 for SLES and 0.1 for Triton X-100, suggesting a complex interplay between surfactant concentration and energy input. These results expand on existing knowledge of bilge water and potentially reducing ocean pollution.
This work investigates the effect of ship rocking on emulsion stability to minimize the release of oil from oceanic vessels.
Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water
Dean, Rina G. (author) / Davis, Cole R. (author) / Zheng, Yue E. (author) / Erk, Kendra A. (author) / Howarter, John A. (author) / Martinez, Carlos J. (author)
ACS ES&T Water ; 3 ; 701-711
2023-03-10
Article (Journal)
Electronic Resource
English
emulsions , stability , coalescence , surfactants , salt , dynamic ageing
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