[en] Results of experimental work to study the biodegradation of the total ionic and anionic dispersants in FINASOL OSR 51 for the biological activators BIOLEN IG 30 and IC 10 were described. BIOLEN IG 30 and IC 10 are mixtures of bacteria chosen for their ability to degrade a wide range of chemical compounds. Biodegradation experiments were conducted in a non-isothermal container at room temperature (between 16.9 and 30.8 degrees C) to simulate the biodegradation process in a natural environment where the temperature cannot be controlled. Additional experiments were conducted at a controlled temperature value of 20 degrees C. Eight different reactor tests were performed with FINASOL OSR 51 dispersed in distilled and sterilized water. The influence of the accelerator INIPOL EAP 22 on the degradation process was also examined. Results from the degradation of the different compounds were presented and their kinetic coefficients were calculated. Biological Oxygen Demand at five days and at the end of the degradation was also determined. This made it possible to calculate the biodegradation constant and the biochemical stabilization constant. 11 refs., 13 tabs., 8 figs