Application of Mixer Technology in Wastewater Treatment

The application of mixers in water and wastewater treatment is an important application area for fluid agitation. The following figures show the different applications of the mixer in these two processes. The processes involved are fast mixing, flocculation, chemical preparation and storage, neutralization, homogenization, anaerobic mixing and sludge mixing.

1. The function of the fast mixing and quick mixing mixer is to quickly mix the added chemical with the raw water during the residence time. From the standpoint of agitation, the fast mixing process is a flow control process, so the choice of medium and high flow axial flow type blades is suitable for Zui.

A traditional design method for fast mixing mixers has long been based on G or GT values. This concept was proposed by TRCamp in the 1940s and 1950s. The G-value correlation is: GT is the product of the G value and the average residence time (T) of the material. Regardless of the G value or the GT value, only the volume of the fast mixing tank, the amount of water treated, the power of the mixer shaft, and the viscosity of the water are considered, and the efficiency of the stirring blade itself is not considered.

The G value originates from the inefficient (low flow) runoff type blade. If the high efficiency axial flow type blade is used, the traditional G value or GT value is still used to design the mixer. The selected mixer is the stirring power or the stirring blade. The amount of liquid discharged will greatly exceed the mixing requirements required for the fast mixing process itself. Therefore, with the development of agitation technology, the G value and the GT value are only used as a reference value for the design of the mixer.

The design method of the high-efficiency axial flow type blade quick mixing mixer is based on the liquid discharge amount of the mixer, and the ratio of the liquid discharge amount of the stirring blade to the effective volume of the quick mixing pool (N) in the average residence time is selected as the selection. The basis for designing a fast mixer. Due to the influence of other factors, the ratio of the dosing amount and the geometric shape of the agitating tank is not fixed, but generally requires n>1.5. When the same blade achieves the same stirring effect (ie, the same ratio n) The stirring power will decrease with the increase of D/T (T is the diameter of the tank or the equivalent diameter). In other words, there is more than one type of mixer suitable for one stirring process, and there are various stirring powers, stirring speed. Combined with the diameter of the blade.

Second, flocculation in the flocculation process, the role of agitation has two points: First, mixing, promote the collision between fine particles, so that the particles gradually grow; Second, the solid suspension, so that the agglomerated particles can be uniformly suspended in the liquid, Prevent it from settling in the flocculation tank. In addition, there is an important constraint in the flocculation and agitation process, that is, the shear stress generated by the shear rate will cause the flocculation particles to be broken, which is why the tip speed limit is usually considered in the flocculation agitation design. FRF series mixers are designed for flocculation process, low speed, high liquid discharge, and high efficiency axial flow type blades, so the traditional G value or GT value is also only for reference.

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