Dissolved air flotation-type pretreatment apparatus

摘要

Disclosed is a dissolved air floatation (DAF)-type pretreatment apparatus. The dissolved air floatation (DAF)-type pretreatment apparatus includes: a floatation tank for removing foreign objects of floating matter, turbid matter, or alga contained in raw water of seawater, sewage, or wastewater; a filtering compartment part provided in the floatation tank and having one surface and the other surface which are partially opened to allow treatment water obtained by primarily removing floating matter from raw water to pass therethrough; and a plurality of filtering balls confined in the filtering compartment part and including a fibrous or spongy material to filter turbid matter or floating or suspended solids remaining in the treatment water introduced to the interior of the filtering compartment part.

主权项

1. A dissolved air floatation (DAF)-type pretreatment apparatus comprising:
a floatation tank; a filtering compartment part disposed below the floatation tank, wherein treatment water obtained by primarily removing floating matter from raw water in the floatation tank is allowed to pass from the floatation tank into an interior of the filtering compartment part; and a plurality of filtering balls confined in the filtering compartment part and including a fibrous or spongy material to filter turbid matter or floating or suspended solids remaining in the treatment water introduced to the interior of the filtering compartment part during a filtration mode, wherein an upper portion of the floatation tank comprises a back wash water door and a first back wash wastewater tray configured to discharge wastewater generated during a backwashing mode, wherein the first back wash wastewater tray is configured to guide wastewater discharged through the back wash water door to the outside, wherein the filtering compartment part comprises at least one second back wash wastewater tray oriented horizontally and installed above the ball loss preventing part with a gap present therebetween and configured to guide back wash wastewater from the filtering compartment part to the back wash water door of the floatation tank during the backwashing mode.