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Vertical Sedimentation Tank Reaction Mixer

Vertical shaft flocculation mixer. It includes a mixer main body and a mixing tank. The mixer main body is connected with a driving mechanism. The driving mechanism includes a reducer and a stirring shaft. A transverse plate is connected horizontally to the stirring shaft, and a paddle is connected to the transverse plate. This utility model has a simple structure and is easy to use.
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Vertical mixer is a commonly used mixing and processing equipment, mainly used in agriculture, food, chemical industry, feed and other industries. Its characteristic is that the machine body is set vertically, and the mixing device on the top mixes the materials in the container, which is generally efficient and uniform.

1. Structural composition: usually includes motor, transmission device, stirring device and container. The electric motor provides power and transmits the power to the stirring device through the transmission device. The stirring device is designed in different forms (such as spiral shape, paddle shape, etc.) according to the needs to achieve different mixing effects of the materials. The container is used to hold the materials to be stirred. materials.

2. Precautions: When using a vertical mixer, you must strictly follow the operating procedures of the equipment to prevent overload operation and ensure that the power cord is well grounded to prevent electric shock; avoid putting your hands into the mixing container during the mixing process. To avoid safety accidents; clean the mixer and container in time after use to keep the equipment clean and hygienic.

1

Application of mixer in sewage treatment:

The application of vertical mixers in sewage treatment is mainly to promote the full mixing and contact of activated sludge and sewage in the sewage tank, accelerate the biochemical reaction process, and improve the efficiency of sewage treatment. The specific working principle is as follows:

1. Mixing function: The vertical mixer is installed at the bottom or middle of the sewage treatment tank. The motor drives the blades to rotate to generate radial or axial water flow, so that the sludge and sewage in the sewage tank can be fully mixed to avoid sedimentation and maintain water quality. Uniform and stable.

2. Oxidation: For aerobic biological treatment processes (such as activated sludge method), the mixer can also help transport oxygen into the sewage, allowing microorganisms to decompose organic matter under aerobic conditions to achieve the purpose of purifying sewage.

3. Distribution homogenization: During anaerobic digestion or biofilm treatment, stirring can effectively disperse and maintain the uniform distribution of microbial communities and improve treatment efficiency.

4. When selecting and configuring equipment, factors such as the shape, size, water depth, sewage characteristics, and treatment process requirements of the sewage treatment tank need to be considered to ensure the working effect of the mixer and the stability of the overall operation of the sewage treatment facility. At the same time, during use, the mixer needs to be inspected and maintained regularly to ensure its normal operation.

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The key roles of vertical mixers in different stages of sewage treatment mainly include the following aspects:

1. Mixing stage before primary precipitation:

• At this stage, the vertical mixer uses fast and effective mixing action to quickly and evenly mix the sewage entering the treatment system with chemicals (such as coagulants), promoting the flocculation of solid particles and improving the effect of subsequent sedimentation or air flotation processes on suspended solids. material removal effect.

• Biochemical treatment stage:

 In biological treatment processes such as the activated sludge method, the vertical mixer ensures full contact and mixing between activated sludge and sewage, which helps microorganisms adsorb and degrade organic pollutants in the water. At the same time, for aerobic systems, stirring also helps to balance the distribution of dissolved oxygen in the water body to meet the oxygen demand required for microbial metabolism.

• Pre-sedimentation area of the secondary sedimentation tank: At this stage, the moderate and gentle stirring of the mixer can prevent the formation of dead zones caused by excessive sludge layer and ensure the clarification effect of the entire sedimentation area.

Anaerobic digester: During the sludge digestion process, the vertical mixer can improve the fluidity of materials in the tank and prevent sludge stratification, allowing anaerobic bacteria to decompose organic matter more effectively in a stable environment and reduce sludge volume and release biogas.

Design considerations include:

• Stirring intensity and form: Select the appropriate stirring speed and blade design according to different processing stages and goals to achieve the best mixing effect without shearing and destroying the microbial structure.

• Power equipment: Determine the power of the mixer based on the size of the pool, the nature of the sewage, and the required processing capacity to ensure that the energy input is neither too high, resulting in increased energy consumption, nor too low, affecting the treatment effect.

• Corrosion resistance and wear resistance: Since the sewage treatment environment is corrosive and abrasive, the mixer material selection should have good anti-corrosion and wear resistance.

• Maintenance convenience and operation stability: The installation location, maintenance space, sealing and control system of the equipment should be considered during design to ensure that the mixer can operate stably for a long time and is easy to maintain and manage.

• Energy saving and noise control: Modern mixer design will also focus on energy efficiency ratio and noise control, selecting high-efficiency motors and optimized mechanical structures to reduce operating costs and environmental impact.

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