(332l) Biosurfactant Fermented from Waste Cooking Oil and Its Application on Oil Sludge Celaning

The maximum biosurfactant concentration of 5.98 g L^-1 was achieved from kitchen waste oil by Pseudomonas aeruginosa. Then biosurfactant was extracted from the broth and applied to wash oil-based drilling cuttings. Effect rules of six parameters on oil recovery were investigated separately, and the main influencing factors of concentration, pH, and temperature were screened out by Plackett-Burman design. And then the oil washing conditions were optimized by response surface method. The maximum recovery rate was predicted to be 70.48%, when rhamnolipid concentration was 325 mg L^-1, pH was 10.70, temperature was 63 °C, washing time was 35 min, stirring speed was 450 r min^-1, and liquid/solid ratio was 5:1. Finally, the optimal washing parameters and corresponding maximum recovery rate were verified through experiment, with the relative error less than 0.006%. The results indicating promising prospect of biosurfactant application in industrial oil recovery.