MEDIA FOR BIOFILTERS Russian patent published in 1996 - IPC

FIELD: treatment of natural and sewage waters and also cleaning of process solution and pulps from suspended matter. SUBSTANCE: media for biofilters has framework made of sheets of polymer material, gaskets and fastening members. Polymer sheets are produced by pneumoextrusion with the preset porosity from 200-300 to 500-1000 μm and 3-20 mm thick. The sheets are joined to obtain bulky sections with use of gaskets in form of sections of polymer tubes 20-200 mm long which provide for the preset spacing between sheets, and flexible rope is used as pulling member. Sections are formed of sheets with the help of supporting posts. Flexible rope and fastening members in form of bolt and threaded bushing are used in sections for tensioning and tightening of gaskets and framework sheets. Besides, media sections may be made in form of module 1-9 m long on which framework sheets are kept by means of rigidly secured rods. EFFECT: higher efficiency. 4 dwg