SEPARATED BIOFILTER SYSTEM FOR NITROGEN REMOVAL

摘要

PURPOSE: Provided is a biological filtration apparatus to enhance removal of nitrogen by conducting nitrification and denitrification in the separated reactors. CONSTITUTION: The apparatus consists of: reactors (21, 22) equipped with a strainer (7) preventing the outflow of medium and an air supplying nozzle (6) for supplying air into therein and a sludge discharge valve (11); a circulation mixing tank (23) for mixing raw wastewater and returned wastewater because returned wastewater is contained with dissolved oxygen preventing nitrification; a pressure gauge (24) for determining backwashing time. In the second reactor (22), the air supplying nozzle (6) is installed in the lower of a media bed (5) for maintaining aeration condition to conduct denitrification.