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US 6,146,532 AGranted
Process for the biological purification of wastewater
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorWalter Troesch
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Abstract
The present invention relates to a process for the biological purification of wastewater in which a liquid stream is fed to the aerobic biological purification stage, which liquid stream has already been freed in advance from undissolved substances using a membrane separation process.
Claims12
A process for the biological purification of wastewater, comprising the steps of:
- quantitatively separating off undissolved substances upstream of a first, aerobic biological purification step, using a membrane separation process;
- and
- feeding the filtrate stream produced in the membrane separation to an aerobic fermentation;
- and
- feeding the concentrate stream produced in the membrane separation into an anaerobic fermentation.
2 more elements
Dependencies are inferred from the claim text.