Patent ID: 8882961

Claim:
A substrate treatment apparatus comprising: a substrate treating unit that treats a substrate; a treatment fluid supply unit that supplies, to the substrate treating unit, a treatment fluid used to treat the substrate; and an exhaust gas treating unit into which an exhaust gas containing the treatment fluid discharged from the substrate treating unit is introduced, wherein the exhaust gas treating unit comprises an exhaust gas treatment chamber, an exhaust gas inlet port provided above the exhaust gas treatment chamber into which the exhaust gas is introduced, an exhaust gas treatment flow path provided in the exhaust gas treatment chamber into which the exhaust gas from the exhaust gas inlet port flows downward, a drain flow path provided in the exhaust gas treatment chamber and communicating with the lower part of the exhaust gas treatment flow path, in which a liquid in the exhaust gas introduced from the exhaust gas treatment flow path flows, and an exhaust gas upward flow path provided in the exhaust gas treatment chamber and communicating with the drain flow path into which the exhaust gas flows upward from a bottom side to a topside, and wherein the exhaust gas upward flow path has a cross-sectional area larger than that of the exhaust gas treatment flow path such that the flow velocity of the exhaust gas in the exhaust gas upward flow path is lower than that of the exhaust gas in the exhaust gas treatment flow path so that a large amount of the liquid can be dropped.