| 摘要 |
1. Process for the continuous purification of effluent with a content of nitrifiable nitrogen compounds of more than 300 mg N/l by nitrification and denitrification with the aid of microorganisms, characterized in that a) the effluent is first introduced into a first nitrification stage in which between 50 and 85 % of the nitrifiable nitrogen compounds are degraded, b) the effluent from the first nitrification stage is introduced into a second nitrification stage in which more than 75 % of the remaining nitrifiable nitrogen compounds are degraded, c) sludge from the second nitrification stage is separated off and reintroduced into the first and second nitrification stages and excess sludge is discharged, d) the nitrified effluent from the second nitrification stage is passed, after the removal of sludge, into a denitrification stage, and e) sludge separated off downstream of the denitrification stage is returned to the first nitrification stage f) the sludge content in the nitrification stages being adjusted to between 1 and 10 g/l by means of the returned portions of sludge and g) the sludge content in the first nitrification stage is adjusted to between 0.12 and 0.35 kg NH4 **+/kg SM x day. |
