TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: In producing whole cell biomass and biosurfactants from waste oil through bioremediation, the consortium of oil consuming bacteria comprise bacteria selected from Pseudomonas aeruginosa, Phenylobacterium immobile, Stenotrophomonas maltophila, Gluconobacter cerius, Agrobacterium radiobacter and Citrobacter freundii and other indigenously available species. The container is a fermentor. The bacteria are genetically modified. The agitation of the admixture supplies oxygen from the atmosphere to the admixture, to produce biomass. The economical method of producing whole cell biomass comprising about 24% by weight carbohydrate and about 34% by weight protein, from waste oil comprises:(A) isolating a source of waste oil in a container;(B) providing an oleophilic suspension comprising physiologically active, species/strains of bacteria that are oil-consuming, in a fatty substance, comprising an oleophilic nutrient as a source of nitrogen and phosphorus for the bacteria, and admixing it with the source of waste oil and an excess of water;(C) agitating the mixture of waste oil, oleophilic suspension and water for a fixed period of time, to produce biomass, carbon dioxide, and water by the consumption of oil by the bacteria;(D) removing the residual oil by solvent extraction; and(E) centrifuging the remaining mixture at a speed less than about 20000 rpm, to separate the whole cells from the cell free, oil-free, water-based liquor.Eliminating waste oil comprises:(A) isolating a source of waste oil in a container;(B) providing an oleophilic suspension comprising physiologically active, species/strains of bacteria that are oil-consuming, in a fatty substance, comprising an oleophilic nutrient as a source of nitrogen and phosphorus for the bacteria, and admixing it with the source of waste oil and an excess of water;(C) agitating the mixture of waste oil, oleophilic suspension and water for a fixed period of time, to produce biomass, carbon dioxide, and water by the consumption of oil by the bacteria; and(D) removing the residual oil by solvent extraction.