Abstract: An installation for the simultaneous separation and removal of fats and oils in waste water, which includes a treatment container chamber for receiving a liquid medium. Out of the treatment container chamber, through a bottom outlet, is an overflow pipe running upwards and which opens outwardly outside of the treatment container chamber as a discharge pipe, so that its inside bottom edge, at the point where it opens outwardly, defines a level of a medium in the treatment container chamber. A support material in the form of a plurality of plastic tubes is wound with lengths of polyester cord colonized with a fat and oil-degrading yeast microorganism Yarrowia lipolytica W1 in the treatment container chamber. A nutrient solution container, with a metering pump for feeding NH.sub.4+ into the treatment container chamber, as required, is included as a source of nitrogen for the fat and oil-degrading microorganism, along with a device for supplying the microorganisms with air.

Abstract: The mixture of natural microorganisms causes a biodegradation of mineral oils and mineral oil products. It contains Pseudomonas putida and Geotrichum candidum in a ratio of the cell-numbers of 5:1 to 1:1. The mixture is induced by a cultivation in the presence of oil-acid. Afterwards, one works with it on hydrocarbons under the supply of oxygen as well as in the presence of stimulation-substances at a pH-value of 4.5 to 7.5 and at a temperature of 5.degree.+C. to 35.degree. C.