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An aeration apparatus including a cylindrical passage tube, a static mixer positioned in the passage tube adjacent an upper end of the tube and including a plurality of perforated blades and an opening between the blades along a central axis of the tube, a pneumatic line extending to the passage tub

An aeration apparatus including a cylindrical passage tube, a static mixer positioned in the passage tube adjacent an upper end of the tube and including a plurality of perforated blades and an opening between the blades along a central axis of the tube, a pneumatic line extending to the passage tube and connectable to a gas source, a gas blowoff portion positioned adjacent a lower end of the passage tube and connected to the pneumatic line for supplying gas from the gas source to the passage tube, and a liquid-introducing portion adjacent the lower end of the passage tube.

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The invention claimed is: 1. An aeration apparatus comprising: a cylindrical passage tube including an inner surface, a lower end, an upper end opposite the lower end, and a central axis extending between the upper end and the lower end; a static mixer positioned in the passage tube adjacent the up

The invention claimed is: 1. An aeration apparatus comprising: a cylindrical passage tube including an inner surface, a lower end, an upper end opposite the lower end, and a central axis extending between the upper end and the lower end; a static mixer positioned in the passage tube adjacent the upper end of the tube and including a plurality of perforated blades extending inward from the inner surface of the passage tube forming inter-blade passages and including an opening along the central axis and between the blades forming a central passage continuously joining the inter-blade passages so fluid flowing through the inter-blade passages and fluid flowing through the central passage interact as these fluids flow past the blades during operation of the apparatus; a gas blowoff portion positioned adjacent the lower end of said passage tube and connectable to a pneumatic line attached to a gas source for supplying gas upward into said passage tube during operation of the apparatus, the gas blowoff portion being separated from the static mixer by a space; and a liquid-introducing portion adjacent the lower end of the passage tube by which liquid is introduced into the passage tube so the liquid flows upward in the passage tube during operation of the apparatus; wherein the gas supplied to the passage tube by way of said gas blowoff portion, and the liquid introduced into said passage tube from the liquid-introducing portion at the lower end of said passage tube during operation of the apparatus come in gas-liquid contact as the gas and liquid flow upward together through said space between the gas blowoff portion and the static mixer of said passage tube and come into additional gas-liquid contact in the static mixer before being discharged from the upper end of said passage tube. 2. An aeration apparatus comprising: a passage tube including a lower end and an upper end opposite the lower end; a first static mixer positioned in the passage tube adjacent the upper end of the tube; a gas blowoff portion positioned adjacent the lower end of said passage tube and including a second static mixer connectable to a pneumatic line attached to a gas source for supplying gas upward into said passage tube during operation of the apparatus, the second static mixer including an inner surface, a plurality of perforated blades extending inward from the inner surface of the second static mixer, a central axis, and an opening along the central axis of the second static mixer between the blades so that some of the gas from the pneumatic line flows around the blades and some of the gas from the pneumatic line flows generally straight upward through said opening during operation of the apparatus, the gas blowoff portion being separated from the first static mixer by a space; and a liquid-introducing portion adjacent the lower end of the passage tube by which liquid is introduced into the passage tube so the liquid flows upward in the passage tube during operation of the apparatus; wherein the gas supplied to the passage tube by way of said gas blowoff portion and the liquid introduced into said passage tube from the liquid-introducing portion at the lower end of said passage tube during operation of the apparatus come in gas-liquid contact as the gas and fluid flow upward together through said space between the gas blowoff portion and the first static mixer of said passage tube and come into additional gas-liquid contact in said first static mixer before being discharged from the upper end of said passage tube. 3. An aeration apparatus according to claim 1, wherein the perforations of said blades have diameters of between about 5 mm and about 30 mm. 4. An aeration apparatus according to claim 3, wherein an aperture ratio of the perforations is between about 5% and about 80%. 5. An aeration apparatus according to claim 1, wherein a twist angle (turning angle) of said blades is one of about 15째, 30째, 45째, 60째, 90째, 180째 and 270째. 6. An aeration apparatus according to claim 1, wherein a pneumatic dispatch tube penetrates the side surface of said passage tube. 7. An aeration apparatus according to claim 1, wherein the lower portion of said passage tube is larger than the upper portion thereof. 8. An aeration apparatus according to claim 1, wherein said blowoff portion includes a spray nozzle connectable to said pneumatic line having a spiraling conical body through which the gas flows during operation of the apparatus. 9. An aeration apparatus according to claim 1, wherein the static mixer is configured so at least three fluid paths are formed in the static mixer whereby some of the gas and liquid flowing through the mixer flows through said inter-blade passages, some of the gas and liquid flowing through the mixer flows through holes in the perforated blades, and some of the gas and liquid flowing through the mixer flows generally straight through said central passage during operation of the apparatus. 10. An aeration apparatus according to claim 1, wherein the static mixer has a diameter Dm and said blowoff portion is spaced from the static mixer by a distance of between about 0.2쨌Dm and about 3.0쨌Dm. 11. An aeration apparatus according to claim 1, wherein the passage tube has a diameter Dt and said blowoff portion is spaced from the static mixer by a distance of between about 0.2쨌Dt and about 3.0쨌Dt. 12. An aeration apparatus according to claim 2, wherein a pneumatic dispatch tube penetrates the side surface of said passage tube. 13. An aeration apparatus according to claim 2, wherein the lower portion of said passage tube is larger than the upper portion thereof. 14. An aeration apparatus according to claim 2, wherein the second static mixer is configured so that at least three fluid paths are formed in the second static mixer whereby some of the gas and liquid flowing through the mixer flows along a surface of the blades, some of the gas and liquid flowing through the second static mixer flows through perforations of the blade, and some of the gas and liquid flowing through the second static mixer flows generally straight through said opening during operation of the apparatus. 15. An aeration apparatus according to claim 2, wherein the first static mixer has a diameter Dm and said blowoff portion is spaced from the first static mixer by a distance of between about 0.2쨌Dm and about 3.0쨌Dm. 16. An aeration apparatus comprising: a passage tube including a lower end and an upper end opposite the lower end; a static mixer positioned in the passage tube adjacent the upper end of the tube including a plurality of blades; a gas blowoff portion positioned adjacent the lower end of said passage tube, connectable to a pneumatic line attached to a gas source for supplying gas upward into said passage tube during operation of the apparatus, and including a spray nozzle having a spiraling conical body through which the gas flows during operation of the apparatus, the gas blowoff portion being separated from the static mixer by a space; and a liquid-introducing portion adjacent the lower end of the passage tube by which liquid is introduced into the passage tube so the liquid flows upward through the passage tube during operation of the apparatus; wherein the gas supplied to the passage tube by way of said gas blowoff portion and the liquid introduced into said passage tube from the liquid-introducing portion at the lower end of said passage tube during operation of the apparatus come in gas-liquid contact as the gas and liquid in said space of the passage tube and come into additional gas-liquid contact in the static mixer before being discharged from the upper end of said passage tube. 17. An aeration apparatus comprising: a passage tube disposed including a lower end, an upper end opposite the lower end, and a central axis; a gas/liquid static mixer positioned in the passage tube adjacent the upper end of the tube including a plurality of blades; a pneumatic line connectable to a gas source extending through the passage tube at the central axis of the passage tube; a plurality of gas blowoff portions positioned adjacent the lower end of said passage tube and connected to the pneumatic line for supplying gas from the gas source upward into said passage tube during operation of the apparatus; and a liquid-introducing portion adjacent the lower end of the passage tube by which liquid is introduced into the passage tube so the liquid flows upward in the passage tube during operation of the apparatus; wherein the gas supplied to the passage tube by way of said gas blowoff portions and the liquid introduced into said passage tube from the liquid-introducing portion at the lower end of said passage tube during operation of the apparatus come in gas-liquid contact as the gas and liquid flow upward through a space of the passage tube and come into additional gas-liquid contact in the static mixer before being discharged from the upper end of said passage tube; and wherein each gas blowoff portion of the plurality of gas blowoff portions includes a gas static mixer comprising a plurality of blades for mixing only said gas as the gas flows through the gas static mixer. 18. An aeration apparatus according to claim 17, wherein the blades of the gas static mixers include multiple perforations.