BIOLOGICAL CARRIER AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a biological carrier predicable without using precipitation separation process or screen separation process having various problems and to provide a process for the production of the biological carrier. SOLUTION: This biological carrier is composed of a hydrated gel of a polyvinyl alcohol containing 20-50vol.% of dispersed polymethylpentene particles and 5-13vol.% of dispersed foamed polystyrene particles and has a specific gravity of 0.92-0.99 and a particle diameter of 2-10mm. The carrier can be produced by adding dispersible particles of the above resins to an aqueous solution of a polyvinyl alcohol, mixing the composition, repeating the freezing and thawing of the mixture to obtain a gel having the above specific gravity and granulating the gel to the above particle diameter.