Fluidized Bed Wastewater Treatment

摘要

A fluidized bed reactor ( 14 ) for removing phosphorus and nitrogen from wastewater has a column comprising a number of sections. ( 15 A, 15 B, 15 C, 15 D) 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.