Method for biological purification of waste water by the activated sludge method and apparatus for carrying out the method
First Claim
1. A method for biological purification of waste water by an activated sludge method, wherein the waste water is continuously passed through at least two treatment zones in which the waste water is successively subjected to nitrification and denitrification, and an optional clarification zone for dividing the treated waste water into a water fraction and a sludge fraction, using an apparatus comprising four treatment zones I, II, III, IV, wherein alternating anoxic and aerobic conditions and optionally sedimentation are established, said treatment zones being arranged around a central supply zone for waste water to be purified wherein only two treatment zones I, IV are provided with means for discharging treated water, untreated waste water from the central supply zone is alternatingly passed into a first of the four treatment zones I, II, III, IV, operated under anoxic conditions, and following an optional treatment in one or two additional treatment zones II and/or III, is passed into a last treatment zone I, IV from which treated waste water is discharged.
3 Assignments
0 Petitions
Accused Products
Abstract
A method and an apparatus for biological purification of waste water by the activated sludge method, whereby the waste water is continuously passed through several treatment zones in which the waste water is successively subjected to nitrification and denitrification. The treatment zones are arranged circularly around a supply zone for waste water, whereby the supply zone is alternatingly connected with one of the treatment zones, and optionally a clarification zone for dividing the treated waste water into a water fraction and a sludge fraction.
31 Citations
10 Claims
- 1. A method for biological purification of waste water by an activated sludge method, wherein the waste water is continuously passed through at least two treatment zones in which the waste water is successively subjected to nitrification and denitrification, and an optional clarification zone for dividing the treated waste water into a water fraction and a sludge fraction, using an apparatus comprising four treatment zones I, II, III, IV, wherein alternating anoxic and aerobic conditions and optionally sedimentation are established, said treatment zones being arranged around a central supply zone for waste water to be purified wherein only two treatment zones I, IV are provided with means for discharging treated water, untreated waste water from the central supply zone is alternatingly passed into a first of the four treatment zones I, II, III, IV, operated under anoxic conditions, and following an optional treatment in one or two additional treatment zones II and/or III, is passed into a last treatment zone I, IV from which treated waste water is discharged.
-
10. A method for biological purification of waste water by an activated sludge method, wherein the waste water is continuously passed through at least two treatment zones in which the waste water is successively subjected to nitrification and denitrification, and an optional clarification zone for dividing the treated waste water into a water fraction and a sludge fraction, using an apparatus comprising treatment zone I, treatment zone II, treatment zone III, and treatment zone IV, wherein alternating anoxic and aerobic conditions and optionally sedimentation are established, said treatment zones being arranged around a central supply zone for waste water to be purified wherein only said treatment zone I and treatment zone IV are provided with means for discharging treated water, untreated waste water from the central supply zone is alternatingly passed into a first of said treatment zone I, treatment zone II, treatment zone III and treatment zone IV, operated under anoxic conditions, and following an optional treatment in one or two of additional treatment zone II and/or treatment zone III, is passed into one of treatment zone I and treatment zone IV from which treated waste water is discharged.
Specification