Sewage treatment equipment air floatation machine with air floatation separation process of flocs

      Talk about the sewage treatment equipment air floatation machine with air flocs floating separation process

Sewage treatment equipment air floatation machine with air flocs in the contact room through the buoyancy, gravity and water resistance balance effect, achieved upward speed U.After entering the separation zone, it is acted on by two forces: one is the horizontal velocity U pushed by the horizontal thrust force after the water diffuses;The second is due to the bottom of the flow generated by the downward velocity U below.The combined velocity and direction of the two flow rates determine whether the aerated flocs float up to be removed or be carried out with the current.The rate of rise or fall depends on the projection of the combined velocity U onto the vertical axis.This speed affects the processing effect of the air float machine.

The size of flocs, the size of bubbles and the flow velocity of water in the floating pool directly affect the upward velocity of synthesis.The higher the speed of synthesis upward, the higher the removal efficiency of air flotation, the smaller the body of air flotation pool, and the lower the cost of the whole project.To make the floating effect good, first of all in the pool body as low as possible U down.It can be realized by enlarging the discharge area at the bottom or improving the uniformity of the effluent. With the uniform collection and discharge at the bottom, the U level of water flow to the end of the pool is about zero, which is conducive to the separation of the flocculates with low upper buoyancy.

If the up-floating removal is to be realized in advance, the U level should be reduced as far as possible, which can be achieved by enlarging the cross section of the floating pool.Then to deal with the size of the flocculant, by dosing mixing, and flocculation reaction to complete, should pay attention to control the following points, the variety of agents, dosage, mixing time and mixing intensity of agents and sewage, the dosage of agents, reaction time and reaction intensity of agents and sewage, the size of the flocculant produced.In addition, the size of bubbles in the dissolved gas system should be controlled.The motion of particles in the separation zone of vertical flow tank is similar to that of horizontal flow tank.

But the horizontal velocity is much smaller, and with the increase of the radial distance, the cross section expands rapidly, and the U plane decreases rapidly.

Especially, the velocity direction of vertical flow is not changed much, the flocs are mainly driven by the upward flow inertia, and the upward partitioning velocity of particles increases, making the separation conditions of air flocs from water much better than that of horizontal flow.However, what form to use still needs to be determined after the comprehensive evaluation of all aspects of the conditions.

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