| abstract |
PURPOSE: To breed bacteria in a carrier, by performing denitrification by charging a carrier particulate material wherein bacteria are immobilized so as to be enclosed with a high-molecular substance, in a treatment tank of sewage containing nitrate. n CONSTITUTION: Sewage enters a reaction tank 1 from an introducing pipe 6 and contacted with a carrier particulate material 4, wherein bacteria are immobilized so as to be enclosed with a high-molecular substance, by the gas lift action of nitrogen gas supplied from the gas diffusion pipe 5 introduced into the lower part of a draft tube 3 to receive denitrification treatment. The formed nitrogen gas is recirculated from a return pipe 9 by a gas stirring blower 8. As the high-molecular substance, polyacrylamide or polyvinyl alcohol is used. n COPYRIGHT: (C)1986,JPO&Japio |