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1. A filtration device for treating wastewater, the device comprising: a distribution channel for distributing a wastewater vertically upward or discharging backwash water, received vertically downward, to outside of the filtration device; a floating filter media for raising due to having a lower specific gravity than water when the wastewater is distributed vertically upward from the distribution channel to filter solids and organics in the wastewater and descending when the backwash water flows in vertically downward to remove attached solids and organics; and a treated water storage tank for receiving the treated water from which solids and organics are removed through the filter media and discharging it to the outside of the filtration device or discharging the backwash water flowing in from the outside of the filtration device to the filter media by spraying, wherein the filter media comprises a first filter media and a second filter media having different sizes and has a lower specific gravity than water, and wherein a layer of the first filter media with a first diameter is disposed below a layer of the second filter media with a second diameter greater than the first diameter in a reaction tank, and the first filter media removes solids, and the second filter media removes dissolve organics in the wastewater using aerobic microorganisms grown on a surface of the second filter media.
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