Abstract: The invention concerns a method for absorbing organic, ecologically stressed pollutants (1) such as oil, tar and phenols on grounds (12), rubble or solid disposal site surfaces which are floating on or in waters of a disposal site with liquid and/or sludge phases and/or solid sediments. This object is achieved in that in the invention fly ash (3) and/or cement-activated fly ash of large surface and evincing the structure of a hollow sphere, especially fly ash from lignite-powder fired boilers, is brought into contact with the pollutant, in that fly ash and pollutant are activated with water (5), being mixed into a pollutant-immobilized mixture (6) and being used in consolidating manner.