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| Wastewater treatment system and method |
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| Overflow water screening apparatus |
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| Sewage filtration system |
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| Treatment system for landfill leachate |
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| Bioconversion reactor and system |
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Process for the biological treatment of waste water
| Details |
Inventors: Kiese, Siegfried; Scheffler, Ulrich;
Assignee: Fried. Krupp Gesellschaft mit beschrankter Haftung (Essen, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A method is disclosed for the biological aerobic purification of waste waters wherein a temperature from 30.degree. to 60.degree. C. is maintained in a first process stage and a temperature from 20.degree. to 40.degree. C. is maintained in a second process stage, with the temperature in the first process stage always being higher than the temperature in the second process stage and wherein a part of the activated sludge of the second process stage, after being seperated, is returned to the first process stage. The process provides a high decomposition output and produces an activated sludge which exhibits good sedimentation behavior. |
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DETAILED DESCRIPTION OF THE INVENTION The process according to the present invention can be implemented to particular advantage if a temperature difference of 5.
degree.
to 40.
degree.
C.
, preferably 15.
degree.
to 25.
degree.
C.
, is maintained between the first process stage and the second process stage.
This temperature difference results in the production of a particularly settleable activated sludge which can be easily separated from the discharge of the second process stage.
It is further provided that the activated sludge returned to the first stage may be reactivated by mixing with air, oxygen or hydrogen peroxide.
With this measure, the decomposition activity (oxidative degradation rate) of the returned activated sludge is increased.
In another embodiment of the present invention, the first process stage or both process stages may be operated with oxygen or oxygen enriched air.
In addition to providing sufficient oxygen for aerobic degradation, this measure improves the thermal balance of the first process stage as the quantity of gas flowing through the stage is reduced and less heat is thus dissipated.
The heat generated in the first process stage during the oxidation reaction is thus utilized to maintain an optimally high reaction temperature.
In a further embodiment of the present invention, activated carbon in a quantity of from 5 to 500 g/l, preferably 10 to 30 g/l, may be added to the waste water, with the result that the sedimentation rate of the activated sludge is improved.
In addition, the activated carbon may aid in removing contaminants which are resistant to biodegradation or which degrade over periods of time larger than the residence time in the biological treatment stages, as well as increase the reaction rate of direct oxidation reactions.
The objects of the invention are further achieved using a particular apparatus for implementing the process, the apparatus comprising two series connected closed loop reactors having a taper (height-to-diameter ratio) of greater than 5, and a separator following the second reactor for removing and concentrating the activated sludge
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