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Screw Decanter Centrifuge Sewage Sludge Dewatering Treatment Plants Water-solid-oil Separation

Automatic control system

The control cabinet of the decanter centrifuge has a built-in PLC programmable controller, which can fully control the main motor, auxiliary motor and flushing valve and other equipment, and input various parameters through the man-machine interface, while monitoring the running status of the equipment. The controller will automatically alarm and display fault information, and the decanter centrifuge has the characteristics of self-diagnosis and easy operation and maintenance.

Variety spiral outlet

The screw conveyor adopts different types of discharge ports according to different industries, such as vortex type, square cemented carbide and ceramic. The discharge port of vortex structure can improve the processing capacity and reduce sludge crushing and flocculation consumption, square carbide discharge port is easy to disassemble and reuse, and ceramic wear-resistant sleeve has the characteristics of wear resistance, corrosion resistance and hygiene level requirements.

    Product Feature

    BD board technology
    The spiral conveyor of BD plate technology is one of the most advanced technologies for reducing moisture content and improving solid recovery of activated sludge. It can improve the decanter centrifuge processing capacity, reduce the moisture content of the sediment, improve the solid recovery rate, clear liquid more clear. Compared with ordinary centrifuges, it has lower working speed, less power consumption, and can also save pharmaceutical consumption and reduce equipment operating costs.

    Anti-wear and anti-corrosion protection
    Our decanter centrifuge is a high-performance device that can be used in a variety of technological processes. In a wide range of applications at the same time, we also fully consider the decanter centrifuge easy to wear problems. And the use of targeted anti-wear configuration, reduce wear, extend the service life, reduce maintenance costs. By choosing our decanter centrifuge, you will get efficient and stable centrifugal separation without frequent replacement of parts.

    Working principle of screw decanter centrifuge machine

    In terms of environmental protection applications, decanter centrifuges mainly refer to the dewatering of sludge generated in the process of industrial and civil sewage treatment. Today's environmental problems have become the focus of common concern all over the world. In this context, the value of decanter centrifuge has been reflected. In the past, sewage plants or related treatment plants have used self-sedimentation or belt filter press to dewater and concentrate sludge. Sludge moisture content from 98% to 80%, its volume can be reduced by 10 times, because of this, decanter sedimentation centrifuge because of its inherent processing capacity, automatic operation, good dehydration effect and other characteristics, in the field of environmental protection has been widely used and promoted. Screw Decanter centrifuge single product sales accounted for about half of all centrifuge products, laying its irreplaceable position. Screw Decanter centrifuge is preferred for sewage treatment equipment.

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    Horizontal screw centrifuge is a kind of spiral unloading and settling decanter centrifuge, which is pushed to the slag discharge port at the small end of the drum by the blade on the spiral pusher, and the liquid phase is spilled through the overflow hole at the large end of the drum. This cycle continues to achieve the purpose of continuous separation.

    The working principle of the screw decanter centrifuge is an important process for separating solids from liquids in various industries. This efficient and effective process is critical for sludge dewatering, waste management and other industrial applications.

    The working principle of the spiral decanter centrifuge is centrifugal sedimentation, which uses a combination of high-speed rotation and differential speed to separate solid particles from liquids. The main and auxiliary motors of the decanter centrifuge drive the drum and differential through the belt, so that the centrifuge drum and the screw conveyor rotate in the same direction at a certain speed difference.

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    When the turbid liquid enters the spiral conveying chamber, it moves into the drum chamber under centrifugal action. The high-speed rotating drum stratifies solid particles and liquids of different densities, forming a solid-liquid annular layer on the inner wall of the drum. The denser solid particles settle close to the inner wall of the drum, forming a sediment layer.

    Subsequently, the solids in the sediment layer are pushed to the cone part of the drum under the action of the rotating spiral conveying blades for squeezing and further dehydration. The dehydrated solid phase is discharged from the drum through the discharge port, and the liquid phase is discharged from the overflow port through the filter. By controlling the position of the overflow port, the depth of the liquid pool can be controlled to achieve specific separation requirements.

    The spiral decanter centrifuge provides an efficient method of sludge dewatering, providing a solution for the treatment and disposal of industrial waste and wastewater. In addition, it can be used for the clarification of liquids in industries such as food and beverage, pharmaceutical and chemical processing. Using a spiral decanter centrifuge can significantly reduce the amount of waste and improve the overall waste management process, making it an indispensable tool for a variety of industrial applications.

    Structure of screw decanter centrifuge equipment

    Generally, decanter centrifuge has the characteristics of compact structure, continuous operation, stable operation and strong adaptability, and large production capacity, convenient maintenance, good dehydration effect, so it is more and more widely used in the field of environmental protection.

    Although different specifications or models of horizontal screw from different manufacturers have different equipment structure, equipment material, specifications and operation adjustment mechanism, but the basic equipment principle is similar. Take Alfa Laval equipment, the most widely used in the industry, as an example, to make some simple introduction to you, so as to facilitate the better use and adjustment of field users.

    Rotary drum

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    The core component of the screw decanter centrifuge is the drum. Its internal structure is composed of two parts: cylindrical shell and internal screw propeller. The axis of the drum intersects the horizontal plane, and the drum is equipped with the separated mixed liquid, suspension liquid or suspended solid material to be separated.

    Screw propeller conveyor

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    The screw propeller conveyor is fixed inside the drum, and its main function is to push the material to be separated to the high-speed separation area generated by centrifugal force. By continuously pushing the material, the screw propeller can make the separation effect more even and thorough.

    Liquid collection tank
    The liquid collection tank is installed at the bottom of the drum, and its function is to receive and collect the pure liquid that is separated. The collection box is equipped with a drain hole to discharge the pure liquid and send it to the next process.

    Other parts and components
    In addition to the above three main components, decanter centrifuge has some other necessary components, such as motor, reducer, bearing, support frame and so on. These components work together to ensure the normal function and efficient operation of the decanter centrifuge.

    To sum up, decanter centrifuge is a widely used separation equipment, through the internal drum, screw propeller and liquid collection box and other parts of the precise coordination, can be mixed liquid, suspension or suspension solid separation of pure liquid or solid, can be used in many fields including chemical, pharmaceutical and environmental protection.

    Characteristics of screw decanter centrifuge

    The structural characteristics of the spiral decanter centrifuge play a vital role in its efficient operation and performance. These characteristics determine the effectiveness and durability of the machine in separating solids from liquids in various industrial applications. Below are some of the key structural features of a spiral decanter centrifuge that contribute to its functionality and reliability.

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    1.The main components such as the rotating drum of the spiral decanter centrifuge are made of corrosion-resistant stainless steel. This ensures the machine's longevity and enables it to withstand the corrosive nature of many industrial materials and processes. The use of stainless steel also helps maintain the hygiene and purity of separated liquids, making it suitable for industries such as food and beverage, pharmaceutical and wastewater treatment.

    2. The conveying screw of the spiral decanter centrifuge adopts special anti-wear measures. A protective layer of carbide can be spray-welded or embedded with carbide wear-resistant sheets to ensure that it can withstand the wear of solid particles during the separation process. This feature increases the durability and service life of the machine, reducing the need for frequent maintenance and replacement parts.

    3. Another important feature of this machine is its large aspect ratio and high rotational speed. The drum cone structure at various angles can effectively separate solids and liquids, making the separated materials reach high purity. This capability is particularly beneficial for industries that require precise and efficient separations, such as mining, oil and gas, and environmental remediation.

    4. Spiral decanter centrifuges are equipped with heavy-duty, high-ratio cycloidal pinwheels, planetary gears or hydraulic differentials to provide the necessary power and torque for their operation. This ensures that the machine can handle a variety of materials and flow rates, making it versatile and adaptable to different industrial requirements.

    5. The machine is equipped with a microcomputer control system that can automatically adjust the speed and torque according to changes in material concentration and flow rate. This level of automation not only makes the separation process more efficient but also reduces the need for manual intervention, thereby increasing the overall productivity of the machine.
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    6. In addition, thanks to the use of a horizontal spiral sedimentation centrifuge with a BD plate, the machine is designed to handle various proportions of difficult-to-separate materials in primary sedimentation and activated sludge. This function enables the machine to concentrate, dehydrate and separate a variety of materials, making it suitable for industries with complex separation requirements.

    In summary, the structural features of the screw decanter centrifuge, such as the use of corrosion-resistant materials, anti-wear measures, high rotational speeds, heavy-duty transmission and automated control systems, make it a reliable and efficient solution. Separating solids from liquids in a variety of industrial applications. Its versatility and ability to handle a wide range of materials and conditions make it a valuable asset to industries where precise and efficient separation is critical to their operations.

    Decanter type centrifugal dehydrator parameters details

    1. Maximum processing capacity
    The maximum processing capacity refers to the maximum amount of liquid that can be handled by the horizontal screw centrifugal dehydrator under stable operation. It is limited by the design and manufacture of centrifugal dehydrators, in general, the maximum processing capacity of horizontal screw centrifugal dehydrators is between 1000L/h and 20000L/h.

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    2. Separation factor
    Separation factor is one of the important parameters to measure the separation effect of horizontal screw centrifugal dewatering machine, also known as centrifugal acceleration (g value), which is determined by the speed and spiral blade structure. The larger the separation factor is, the better the separation effect is, but it also means that the equipment cost and maintenance cost are also higher. Generally speaking, the separation factor of horizontal screw type centrifugal dewatering machine is between 800 and 3000.

    3. Speed
    Speed is one of the important parameters of decanter centrifugal dewatering machine, which affects the centrifugal force and treatment effect. Generally speaking, the speed of the horizontal screw type centrifugal dewatering machine is between 2500rpm and 4500rpm.

    4. Power
    Power is the power consumed by the decanter centrifugal dehydrator, and it is also one of the important parameters to evaluate the equipment. Generally speaking, the power of the decanter centrifugal dehydrator is between 4kW and 22kW.
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    Scope of application:

    Because the horizontal screw centrifugal dehydrator has the advantages of high separation efficiency, full automatic control, and large difference between solid and liquid phases, it is widely used in many industries, such as chemical, pharmaceutical, food, environmental protection and other fields. It can handle all kinds of solid-liquid mixtures, especially materials containing solid particles.

    When using decanter centrifuge, the following points should be paid attention to to ensure good use effect:
    1. Clean the supernatant reflux tube regularly to ensure the smooth flow of the liquid channel.
    2. Clean the mud screw pump regularly to reduce the solid content of the supernatant and reduce the degree of centrifuge wear.

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    3. Choose the appropriate flocculant, according to sludge characteristics, sludge pH and flocculant concentration and other factors to decide.

    4. Adjust the differential to make the speed of the drum and the screw conveyor reach a suitable proportion to improve the separation effect.

    5. Regularly check and maintain the equipment to ensure the normal operation of all components.
    In short, decanter centrifuges separate solid particles from liquid in suspension by means of high-speed rotating drums and screw conveyors. In the process of use, it is necessary to pay attention to the maintenance and adjustment of each component, as well as the selection of flocculant, in order to achieve good separation effect.