POROUS HYDROPHILIC POLYURETHANE CARRIER USED TO ADHERE MICROORGANISM FOR TREATMENT OF WASTEWATER CONTAINING ORGANIC MATERIALS AND NITROGEN COMPRISING POLYOL, CROSSLINKING AGENT, CHAIN EXTENDER AND AROMATIC POLYISOCYANATE, AND ITS PREPARATION METHOD

摘要

PURPOSE: Provided are a porous hydrophilic polyurethane carrier used to adhere microorganism for the treatment of wastewater which is excellent in mechanical properties, hydrophilicity and the adhesion of nitrifying bacteria easily adhered to a hydrophilic medium and maintains a wastewater treatment efficiency to be high even in case of the increase of nitrogen load, and its preparation method. CONSTITUTION: The porous hydrophilic polyurethane carrier has a water content of 50-96 %, a contact angle of 10-40 degrees and a bulk density of 0.015-0.045 g/cm¬3. Preferably the polyurethane carrier is prepared by foaming a networked hydrophilic polyurethane obtained by the reaction of a polyol having two hydroxyl groups per a molecule and having a molecular weight of 800-5,000 g/mol, a crosslinking agent having three to six hydroxyl groups per a molecule, a C1-C6 alkanediol chain extender, and an aromatic polyisocyanate having two or three isocyanate groups per a molecule.