NOVELTY - Treating industrial wastewaters containing at least one dye, involves providing a fungal biomass comprising fungal species of Cunninghamella elegans Lendner; and contacting the fungal biomass with the industrial wastewater to enable the absorption of the dye by the fungal biomass, thus obtaining wastewater that is basically free of the at least one dye.    USE - For treating industrial wastewaters containing dye e.g. chromophore group such as azo groups, anthraquinone groups, phthalocyanine groups, indigo groups and stilbene groups (claimed) in industrial field, e.g., food, drug, cosmetic, textile and tanning fields.    ADVANTAGE - The deactivated biomasses of Cunninghamella elegans Lendner MUT 2861 have high biosorption yields, both towards single dyes belonging to the main classes of industrial dyes (azo and anthraquinone dyes), towards a simulated wastewater containing ten dyes differing in chromophore group (azo, anthraquinone or phthalocyanine group) and in chemical group (acid, reactive or direct group), and towards three effluent models designed to mime wastes produced during cotton or wool textile dyeing processes. The starch is a byproduct of several industrial processes and represents therefore a low-cost carbon source. This reduces biomass production costs. The process provides good decolorization percentage with simulated wastewaters at a concentration of 1000 parts per million (ppm). Thus, the biosorption process is rapid and is almost fully completed within few hours.    DETAILED DESCRIPTION - Treating industrial wastewaters containing at least one dye, involves providing a fungal biomass comprising the fungal species Cunninghamella elegans Lendner; and contacting the fungal biomass with the industrial wastewater for a sufficient lapse of time to enable the absorption of the dye by the fungal biomass, thus obtaining wastewater that is basically free of the dye. The fungal biomass is grown in a culture medium containing a carbon source. The fungal biomass is deactivated. The fungal biomass is immobilized on a support structure.