An air floatation method, applied to a minimal high-efficient air floatation machine, the minimal high-efficient air floatation machine comprising:
- an air floatation pool body, a spiral water input pipeline, a return pump, an air intake pipeline and a dissolved gas pipeline, wherein the air floatation pool body has a scum output pipeline coupled to the top of the air floatation pool body, and a water output pipeline coupled to the bottom of the air floatation pool body;
- the spiral water input pipeline has a chemical addition port (a) at a water inlet, and an end of the spiral water input pipeline is in communication with the air floatation pool body;
- the return pump and the water output pipeline are coupled to each other, and the air intake pipeline and the return pump are coupled to each other;
- and the dissolved gas pipeline is coupled to the return pump and an end of the spiral water input pipeline;
- wherein the air floatation pool body has an upper cone at the top opening of the air floatation pool body and a lower cone at the bottom opening of the air floatation pool body, and an air floatation pool is formed and enclosed by the upper cone, air floatation pool body and lower cone;
- the scum output pipeline is coupled to the top of the upper cone, and the water output pipeline is coupled to the bottom of the lower cone;
- wherein the water output pipeline has a height adjustable upwardly with respect to the pipeline after the bottom of the lower cone is coupled to the outside;
- wherein the spiral water input pipeline has an end sheathed and coupled to the water output pipeline and penetrates perpendicularly upward from an interface between the water output pipeline and the lower cone and deeply into the air floatation pool body such that the end of the spiral water input pipeline is at a center of the air floatation pool body;
- wherein the end of the spiral water input pipeline forms a double-layer trumpet structure;
- wherein the water output pipeline has a return pump inlet coupled to the return pump through a manual valve (a);
- wherein the air intake pipeline comprises a manual globe valve (a), a liquid flow meter, a Venturi tube, a pipe mixer and a manual valve (b) sequentially coupled to one another, and the Venturi tube is coupled to a gas flow meter through an air pipe;
- wherein the dissolved gas pipeline comprises a check valve, a manual globe valve (b), a dissolved gas pressure regulation can and a manual globe valve (c) sequentially coupled to one another;
- the return pump has an outlet coupled to the check valve, and the check valve prevents flowing fluid from returning to the return pump;
- the manual globe valve (c) is coupled to an end of the spiral water input pipeline;
- and the dissolved gas pressure regulation can has a pressure gauge and a pressure relief valve disposed thereon and coupled thereto;
- and
- wherein the spiral water input pipeline has a chemical addition port (b) disposed at a middle section of the spiral water input pipeline;
- wherein the method comprises the steps of:
- (a) introducing sewage into the water inlet of the spiral water input pipeline, while adding chemicals from the chemical addition port (a) and the chemical addition port (b) into the spiral water input pipeline, and both sewage and chemicals are spun, mixed, and reacted in the spiral water input pipeline to form a floc;
- (b) passing the sewage with the floc obtained in the step (a) from the spiral water input pipeline through the bottom of the lower cone into the air floatation pool body;
- (c) introducing the sewage that passes into the air floatation pool body through the water output pipeline and manual valve (a) into the return pump;
- (d) introducing a part of the sewage contained in the return pump into the air intake pipeline, and into the liquid flow meter- and Venturi tube by adjusting the opening level of the manual globe valve (a);
- passing the sewage through a tapered throat of the Venturi tube to produce a negative pressure to suck air from the gas flow meter, and mixing the air introduced into the Venturi tube through the air pipe and further using a pipe mixer for the air mixing and a manual valve (b) for an adjustment of a flow rate of the air mixed with the sewage, and introducing the air mixed with the sewage into the return pump;
- (e) pumping the remaining sewage from the return pump through the check valve and manual globe valve (b) into the dissolved gas pressure regulation can;
- dissolving the air contained in the sewage in the dissolved gas pressure regulation can at a specific pressure condition and introducing the dissolved air in the sewage;
- building up the pressure of the sewage by the manual globe valve (c) after the air is dissolved, and introducing the dissolved air from the dissolved gas pipeline into an end of the spiral water input pipeline, and mixing the air with the sewage of the dosing reaction to form a mixture of aerated water and reacted floc, and dispersing the air guided by the double-layer trumpet structure as a standard flow into the air floatation pool body;
- and
- (f) placing the mixture of the aerated water and the reacted floc formed in the step (e) into the air floatation pool body, lifting the floc by tiny air bubbles to form a scum, adjusting the water output pipeline to an appropriate height, so that the scum floats to the upper cone and enters into the scum output pipeline automatically;
- and flowing the sewage water into the water output pipeline of the lower cone.