Patent ID: 8721834

Claim:
An apparatus for treating a substrate using a plurality of treatment solutions, the apparatus comprising: a supporting member configured to receive the substrate thereon and rotating the substrate; a treatment liquid supplying member configured to supply the treatment solutions to the substrate placed on the supporting member; a treatment liquid collecting member configured to form a first space for placing the supporting member and including a plurality of treatment liquid collecting vessels arranged for separately collecting the treatment solutions supplied from the treatment liquid supplying member; an exhaust member configured to separately discharge pollutant gases generated from the treatment solutions during the treatment of the substrate; and a lifting member configured to move at least one of the supporting member and the treatment liquid collecting member so as to change a height of the supporting member relative to inlets of the treatment liquid collecting vessels, wherein each of the plurality of treatment liquid collecting vessels include, an inner collecting vessel closest to the supporting member, the inner collecting vessel including, an inner base including a bottom wall, an inner wall, and an outer wall that form a second space for receiving the treatment solution and the pollutant gas, the bottom wall of the inner base including a drain hole for discharging the treatment solution, the inner wall of the inner base including a first opening for discharging the pollutant gas, and an inner guide on the outer wall of the inner base providing a passage to introduce the treatment solution and the pollutant gas into the second space formed in the inner base, and an outer collecting vessel surrounding the inner collecting vessel and more distant from the supporting member, the outer collecting vessel including, an outer base including a bottom wall and an outer wall that form a third space for receiving the treatment solution and the pollutant gas, the outer base including a drain hole for discharging the treatment solution, and an outer guide on the outer wall of the outer base providing a passage to introduce the treatment solution and the pollutant gas into the third space formed in the outer base, wherein the exhaust member includes a separating plate dividing the third space, such that the pollutant gas introduced into the third space through the outer guide is separately discharged from a pollutant gas introduced into the third space through the inner guide and the inner base, an upper end of the separating plate being coupled with the bottom wall of the inner base and a lower end of the separating plate being coupled with the bottom wall of the outer base, and wherein the first opening is disposed higher than the upper end of the separating plate.