Method for purification of wastewater
AssigneeNordic Water Products AB
InventorKurt A. Jonsson
Life of this patent
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Abstract
A method of reducing nitrogen, phosphor, and excessive biological oxygen demand (BOD) in wastewater supplied to and passing through a granular filter bed activated with bacteria includes in the flow direction of the wastewater through the bed simultaneously precipitation of phosphorous, denitrification and reduction of the excessive BOD in a single process step. The reduction of excess BOD is produced by blowing in an oxygen-containing gas, preferably air. Immediately before the wastewater enters the filter bed a precipitation/flocculation agent may be added for precipitation of phosphor.
Claims20
A method of reducing nitrogen, phosphor and excessive biological oxygen demand (BOD) in wastewater, comprising:
- supplying said wastewater to a granular filter bed for passing said wastewater therethrough;
- activating said granular filter bed with bacteria;
- and
- in the flow direction of said wastewater through said filter bed simultaneously precipitating said phosphor, reducing said nitrogen and reducing said excessive BOD in a single process step.
Dependencies are inferred from the claim text.