Liquid purification or separation – Processes – Treatment by living organism
Patent
1987-01-21
1988-11-22
Wyse, Tom
Liquid purification or separation
Processes
Treatment by living organism
210623, 210631, 210903, C02F 308
Patent
active
047864133
ABSTRACT:
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.
REFERENCES:
patent: 4500429 (1985-02-01), Reimann et al.
patent: 4521311 (1985-06-01), Fuchs et al.
patent: 4566971 (1986-01-01), Reimann et al.
Fuchs Uwe
Reimann Hans
Linde Aktiengesellschaft
Wyse Tom
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