Patent ID: 8545668

Claim:
A substrate processing apparatus comprising: a substrate holding mechanism which generally horizontally holds and rotates a substrate; a process liquid supplying mechanism for selectively supplying a first process liquid and a second process liquid to the substrate held by the substrate holding mechanism; a first guide portion provided around the substrate holding mechanism for guiding the first process liquid scattered from the substrate rotated by the substrate holding mechanism to cause the first process liquid to flow down; a second guide portion provided around the substrate holding mechanism for guiding the second process liquid scattered from the substrate rotated by the substrate holding mechanism to cause the second process liquid to flow down; a drain channel for draining the first process liquid guided by the first guide portion; a first recovery channel for recovering the second process liquid guided by the second guide portion; an evacuation mechanism for forcibly evacuating the drain channel; a driving mechanism for moving up and down the first guide portion and the second guide portion; a first partition wall separating the drain channel and the first recover channel; and a first isolation member provided between the drain channel and the first recovery channel and connected to the first guide portion and the first partition wall, the first isolation member being cooperative with the first guide portion and the first partition wall to atmospherically isolate the drain channel and the recovery channel from each other, wherein the drain channel and the first recovery channel are atmospherically isolated from each other and the recovery channel is not forcibly evacuated.