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US 4,786,413 AGranted
Process for biological sewage purification
AssigneeLinde Aktiengesellschaft
InventorsHans Reimann, Uwe Fuchs
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AssigneeLinde Aktiengesellschaft
InventorsHans Reimann, Uwe Fuchs
Estimating the term…
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 BOD.sub.5 volume load of 0.4 to 2.5 kg/m.sup.3 d and a TKN volume load of 0.1 to 0.8 kg/m.sup.3. d, BOD.sub.5 decomposition, nitrification and denitrification are all performed within an undivided reactor, in which the O.sub.2 concentration within the liquid is 0.5 to 4 mg/l and the support material occupies 15 to 35% of the reactor volume.
In a process for the biological sewage purification of sewage wastewater containing organic as well as nitrogen-containing pollutants, in which wastewater is aerated 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, resultant effluent is separated into purified water and sludge, and the separated sludge is at least partially recycled into the reactor and in which free-flowing particles of material are employed in the reactor as supports for the microorganisms, the improvement comprising employing in an elongated undivided reactor a volume load of BOD.sub.5 of about 0.4 to 2.5 kg/m.sup.3 .multidot.d and a TKN volume load of about 0.1 to 0.8 kg/m.sup.3 .multidot.d, and simultaneously conducting BOD.sub.5 decomposition, nitrification and denitrification of the wastewater in the reactor wherein an O.sub.2 concentration in liquid being treated is about 0.5 to 4 mg/l and the support material occupies about 15 to 35% of the reactor volume, so as to simultaneously decompose and remove carbon-containing and nitrogen-containing compounds from said wastewater in said undivided tank.
A process for the biological purification of sewage wastewater containing organic and nitrogen-containing pollutants, comprising:
Dependencies are inferred from the claim text.