DEVICE AND METHOD FOR BIOLOGICALLY TREATING WASTE WATER

摘要

The invention concerns a device and a method for biologically treating waste water, in particular, for purifying waste waters mainly fouled with light materials, particularly oils and fats. The device comprises: a stacking tank (110; 210) with an inlet pipe (111; 211); a reactor tank (120; 220) comprising an inflow line (121; 221) for supplying waste water from the stacking tank (110, 210) to a lower bottom area (122; 222) of the reactor tank (120; 220); at least one fluidized bed (130) situated above the lower bottom area (122; 222); an extracting device (150; 250) situated above the fluidized bed (130) but underneath a liquid level (123; 223) inside the reactor tank (120; 220); a return line (124; 224) for extracting liquid above the fluidized bed (130) and for returning it to the stacking tank (110, 210), and; a gas introducing device (160; 260) for introducing a gas, particularly air, underneath the fluidized bed (130).