Process for the treatment of waste water containing specific components e.g. ammonia
AssigneeDHV Water B.V.
InventorArnold Gerrit Zilverentant
Life of this patent
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Abstract
A process is described for the biological treatment of waste water containing a specific component such as ammonia, wherein the waste water together with surplus sludge from an activated sludge reactor is treated in a bioaugmentation reactor, applying a hydraulic retention time in the continuously or discontinuously operated reactor which is shorter than the sludge retention time by retaining part of the sludge in the reactor and continuing the use of the separated part in the reactor. The non-retained part of the sludge, together with the effluent of the bioaugmentation reactor, is added to the activated sludge reactor.
Claims12
A process for the combined biological treatment of waste water containing one or more specific components and waste water containing non-specific COD and lower concentrations of the specific component, comprising the steps of:
- a) treating the waste water containing the non-specific COD in an activated sludge reactor;
- b) pretreating the waste water containing the one or more specific components in an aerated, bioaugmentation reactor to produce an effluent;
- c) feeding the effluent from the bioaugmentation reactor to the activated sludge reactor;
- d) feeding a part of the sludge from the activated sludge reactor to the bioaugmentation reactor, said part being 1 to 25 weight percent of the amount of the sludge from the activated sludge reactor returned to the activated sludge reactor;
- and
- e) feeding a part of the sludge from the bioaugmentation reactor to the activated sludge reactor.
Dependencies are inferred from the claim text.