Which part of the wastewater is quickly distributed to the backwash filter agent?

The mixing is mainly to quickly distribute the backwash filter agent to each part of the wastewater. The water and the agent are quickly mixed to reduce or eliminate the stability of colloidal particles in the water. Mixing requires vigorous and short stirring for the best results. The reaction stage promotes the collision of colloidal particles that have lost their stability. The colloidal particles of wastewater have initially agglomerated and produced fine flocs. Then it becomes big and becomes flocs and flocs. The reaction takes a long time and should be stirred gently. When the flocs become large and mature, they flow into the sedimentation tank or flotation tank for solid-liquid separation. Backwashing filter, but in order to make the floc particles sink or float quickly, it must have sufficient particle size (0.6-1.0) and sufficient strength, so the reaction stage is to create a strip, and the quality is higher. The mixed reaction equipment must meet the following conditions:

  1. To make the water flow have an appropriate degree of turbulence, create good collision opportunities and adsorption conditions for the small flocs, and prevent the larger flocs from sinking. As the summary becomes larger, the degree of water turbulence should be gradually reduced to prevent breakage.
  2. Ensure a certain reaction time. In order to obtain large-particle high-quality flocs, a certain growth time is required for flocculation. The reaction time varies with water quality. If the reaction time is too long, it can increase the number of particle collisions. It helps to grow large flocs, but increases the volume of the reaction tank.

There are many types of mixing equipment. The power used for work is nothing more than mechanical and hydraulic. Commonly used are water pump mixing and pressure pipeline mixing. There are roughly four types of flocculators actually used in backwash filters: pipeline or pool mixing type, baffle static mixing type, stirring type and particle type.

Pipeline flocculator static mixer, also known as baffle flocculator, fixes the baffle in a container, trough or pipeline. When the suspension passes through the baffle, it will produce up and down or continuous flow. So it plays a role similar to a stirrer. This type of flocculator can usually be made into a honeycomb or labyrinth type. The device is to twist several 180. The leaves are staggered 90. Fixed in the pipeline, when the fluid flows through the pipeline, the mixing and stirring of the fluid is completed under the splitting and shearing action of the torsion blade. Within a certain length, the fluid repeatedly changes the direction of rotation and flows through the torsion blade to achieve solid-liquid continuity. The mixing and stirring and the constant collision between the particles aggregate.

The energy of the mixing and stirring of the static mixer comes from the flow of the fluid itself. Therefore, during the working process, the backwash filter only needs to compensate the pressure loss of the mixing part. Because it is static mixing, the pressure loss is small, so the energy efficiency is high, and it is a low-energy, high-efficiency mixing and stirring device. In addition, the static mixer has no moving parts, so the structure is simple, the cost is low, the operation and maintenance are convenient, and it is easy to be pipelined and automated. It is expected that its application prospects will continue to expand.

Reverse Osmosis & Water Filtration Systems in Wastewater Treatment

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