Patent ID: 7571899

Claim:
A gas-liquid dissolving apparatus that dissolves an oxygen-containing gas into water taken in from an oxygen-deficient water area, increases a dissolved oxygen concentration of the water, and returns the increased dissolved oxygen concentration water to the oxygen-deficient water area, the apparatus comprising: an intake unit that takes in to-be-treated water from the oxygen-deficient water area; a supplying unit that supplies the oxygen-containing gas; a bottomed gas-liquid dissolving chamber that has at least one hole formed in a lower portion and that has a top plate provided in an upper portion; a nozzle that ejects the gas supplied by the supplying unit and the water supplied by the intake unit upward so that the gas and the water strike against an inner wall of the top plate, that fills the gas-liquid dissolving chamber with bubbles of the gas and the water, and that vigorously agitates the bubbles and the water by forces of the ejected gas and water; a gas-liquid separating chamber that is provided outside the gas-liquid dissolving chamber while communicating with the gas-liquid dissolving chamber through the holes, that separates the bubbles and the water flowing out from the gas-liquid dissolving chamber through the holes from each other while storing the bubbles and the water, that has a gas-vent hole formed in an upper portion of the gas-liquid separating chamber for releasing the separated bubbles to an outside, and that has a takeout port provided in a lower portion thereof for taking out the water separated from the bubbles; and a water supplying unit that returns the water taken out from the takeout port to the oxygen-deficient water area.