Biological waste water treatment

摘要

Biological treatment of waste water is effected using a polyurethane biomass support in an amt. of at least 0.5 g/l. The support comprises hydrophilic and/or hydrophobic polyurethane, pref. with cationic gps., contg. 15-95 wt.% filler and having a water uptake capacity of 33-97 (esp. 50-97) wt.%. - The filler comprises one or more of finely divided fossil lignocelluloses or natural materials contg. their conversion prods., activated charcoal, powdered cork, finely divided organic distn. residues with a b.pt. above 100 deg. C (esp. from tolylene diisocyanate prodn.), finely divided inorganic fillers and homogeneous or cellular plastics particles (esp. polyurethane foam particles up to several cm in size).