Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ahren Thomas Britton0
Noboru Yonemitsu0
Fred A. Koch0
Donald S. Mavinic0
Date of Patent
April 12, 2011
0Patent Application Number
125785730
Date Filed
October 13, 2009
0Patent Primary Examiner
Patent abstract
A fluidized bed reactor for removing phosphorus and nitrogen from wastewater has a column comprising a number of sections. The diameter of the column changes stepwise between the sections. A flow velocity in excess of 100 cm/min is maintained in a lowermost one of the sections and lower flow velocities are maintained in subsequent sections. A struvite supersaturation ratio is controlled in part by recycling wastewater from an outlet of the column. Struvite pellets are removed periodically from the bottom of the column.
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