TECHNOLOGY FOCUS - ENVIRONMENT - Preferably the bacterial composition comprises (i) at least one flora F1 of bacteria adapted to biodegradation of the support, (ii) and/or at least one flora F2 adapted to cleaning and maintenance of sewer pipes for the evacuation of the polluted effluents and/or (iii) at least one flora F3 of bacteria adapted to depollution of sewage treatment sites. Claimed bacterial composition comprises as flora F1 a culture of Rhodococcus rubica and Rhodococcus rubra in a broth containing nutrients, preferably of a peptidic nature; as flora F2 a culture of Bacillus subtilis, Pseudomonas putida and Pseudomonas putrefaciens in a broth as for F1; and as flora F3, a culture of Bacillus subtilis, Pseudomonas putida, Pseudomonas putrefaciens and Rhodococcus rubica in a broth as for F1 and F2. The bacterial composition may additionally contain nutrients and/or enzymes. The system is prepared by contacting the biodegradable support with the active bacterial suspension and eliminating the liquid phase of the suspension, e.g. by evaporation.    TECHNOLOGY FOCUS - TEXTILES AND PAPER - The biodegradable support is preferably a cellulosic material, particularly paper and especially paper in the form of a cellulose wadding for use as toilet paper or papers for hygenic applications. EXAMPLE - Three separate cultures were prepared by reactivation and fermentation of commercial lyophilized bacterial strains to give nutrient broths comprising (A) a flora F1 containing a culture of Rhodococcus rubica and Rhodococcus rubra, (B) a flora F2 a containing a culture of Bacillus subtilis, Pseudomonas putida and Pseudomonas putrefaciens and (C) a flora F3 containing a culture of Bacillus subtilis, Pseudomonas putida, Pseudomonas putrefaciens and Rhodococcus rubica. Each broth contained about 1010 bacteria/ml. The three broths were mixed and used to impregnate a commercial 2-ply toilet paper in an amount of 200 mul of suspension per gram of paper or 850 mul per 10 sheets. After drying and storage in a sterile medium for 1 week the paper was tested by conventional microbiological techniques and indicated a total flora of 7 x 105 bacteria/g; good lipasic activity (B. subtilis) of 1.1 x 106 /g, and overall activity approaching that of conditions on traditional supports already on the market (lithothamme, zeolites, bran) (2 x105 bacteria/g).