| 摘要 |
In a process for the biological sewage purification of sewage containing organic as well as nitrogen-containing pollutants, carbon decomposition and nitrogen removal are performed. The sewage is gassed with air and/or pure oxygen in a reactor in the presence of a biomass fixed on a support material and then, in a secondary sedimentation step, is separated into purified water and sludge. The sludge is at least partially recycled into the reactor. Particles of support material in lumpy and/or granulated form and in free-flowing quantities are employed in the reactor as support material for the microorganisms. To attain both a high carbon and a high nitrogen decomposition at the same time, the reaction is provided with BOD5 volume load of 0.4 to 2.5 kg/m3d and a TKN volume load of 0.1 to 0.8 kg/m3. d, BOD5 decomposition, nitrification and denitrification are all performed within an undivided reactor, in which the O2 concentration within the liquid is 0.5 to 4 mg/l and the support material occupies 15 to 35% of the reactor volume.
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