Effect of rhamnolipids on the dissolution, bioavailability, and biodegradation of phenanthrene

Article Abstract:

The biosurfactants monorhamnolipid and dirhamnolipid appear to increase the solubility and biodegradation rates of polycyclic aromatic hydrocarbons such as phenanthrene. Monorhamnolipid hastens solubilization better than dirhamnolipid but their overall rates of mineralization are essentially the same which could be due to the variable bioavailability of the substrate. Results indicate that the effect of surfactants on biodegradation depends on the solubilizing power of the surfactant and the bioavailability of the substrate within the surfactant miscelles.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Surface active agents, Surface Active Agent Manufacturing, Aromatic Hydrocarbons, Polycyclic aromatic hydrocarbons

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Biosurfactant (rhamnolipid) sorption and the impact on rhamnolipid-facilitated removal of cadmium from various soils under saturated flow conditions

Article Abstract:

Rhamnolipid treatment was more effective for removing cadmium from three soils tested under saturated flow conditions than treatment with an KNO3 electrolyte solution. However, soil dispersion and column plugging were observed when rhamnolipid treatment was done on the fourth soil tested that has the highest clay content. With the electrolyte treatment, only between 15% and 36% of the cadmium was removed while 8% to 54% of cadmium was removed by rhamnolipid treatment.

Research and Development in the Physical, Engineering, and Life Sciences, Pollution R&D NEC, Methods, Soil pollution, Soil disinfection, Soils, Pollution control research, Cadmium, Soil chemistry

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Removal of cadmium, lead, and zinc from soil by a rhamnolipid biosurfactant

Article Abstract:

Metal biosurfactant selectivity and related metal desorption from soils were examined in the application of rhamnolipids in remediation technologies. Cadmium, lead and zinc were used as metal samples, while a monorhamnolipid acid from Pseudomonas aeruginosa ATCC 9027 was applied in batch solution and soil experiments. Metal presence in soils conditioned rhamnolipid sorption prior to rhamnolipid addition.

Pseudomonas aeruginosa, Soil absorption and adsorption, Absorption, Soil science

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