可調湍流渦旋絮凝技術的試驗研究
[Abstract]:The adaptability of traditional water treatment equipment to raw water flow and sudden change of water quality is poor, which results in the instability of effluent quality. According to the theory of vortex flocculation, an adjustable turbulent vortex flocculation cell is designed. The experimental results show that better flocculation effect can be obtained by placing the arc blade and adjusting the rotating angle of the blade so as to improve the quality of the effluent. In this paper, the structure and destability of colloid are introduced, then the flocculation kinetics and the theory of turbulent vortex flocculation are described in detail. Based on the traditional reciprocating baffle flocculation tank, an adjustable turbulent vortex flocculation tank was designed. The flocculation process was studied by controlling the turbidity of raw water, the flow rate of flocculant and the rotating angle of blade. The optimal conditions under different control variables are obtained. Different from the experimental study of the traditional flocculation tank, this paper not only studies the flocculation effect of the adjustable turbulent vortex flocculation pool in 12 corridors, but also innovatively combines the adjustable turbulent vortex flocculation pool. By studying the flocculation effect of the two corridors in front of the flocculation tank, the flocculation mechanism was further understood. The reaction process in front of flocculation tank is the initial stage of flocculation reaction, and it is an important part in the whole flocculation process. In the flocculation test of two corridors, under the same raw water flow rate, different turbidity of raw water and different blade conditions, the first and second corridor blade angles are 45? The flocculation effect is the best. In the flocculation experiment of 12 corridors, different raw water flow, different turbidity of raw water, different flowrate of flocculant, different working conditions of blade, the flocculation effect of placing blade in corridor is better than that without blade, and the flocculation effect of blade angle is 45 擄to 0 擄. From the experimental results, it can be concluded that the installation of an appropriate angle arc blade group in the reciprocating baffle flocculation tank can promote the flocculation process well. According to the dynamic cause of flocculation, the density (inertia) of water particles is different from that of water particles. When the velocity of water changes (the average velocity of water flow or the direction of flow movement), it will cause the particles in water to move relative to the water flow. This provides dynamic conditions for particle collisions of different scales. The vortex produced by the flow through the arc blade changes the direction of the flow and changes the velocity of the flow, resulting in the relative movement of particles and the flow, which creates the hydrodynamic conditions for flocculation. Therefore, by controlling blade angle to produce a vortex of appropriate scale, hydrodynamic conditions conducive to flocculation can be created, thus increasing the effective number of collisions of colloidal particles, finally forming a dense flocculation sedimentation, and achieving the effect of reducing the turbidity of effluent.
【學位授予單位】:杭州電子科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TQ085.4
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