Working principle
The working principle of the decanter centrifuge is based on the centrifugal sedimentation principle. Its core components include a high speed drum, a screw conveyor with a hollow shaft rotating in the same direction as the drum but at a slightly lower speed, and a differential. When the suspension is fed into the drum by the hollow shaft, under the action of centrifugal force generated by the high-speed rotation, the solid-phase particles are thrown against the inner wall of the drum to form a solid ring layer, while water and other liquid phases form a liquid ring layer. Using the relative motion of the spiral and the drum (i.e., speed difference), the sludge of the solid ring layer is slowly pushed to the conical end of the drum and continuously discharged from the outlet after passing through the drying zone; the liquid ring layer of the liquid by gravity from the weir mouth of the continuous “overflow” discharged to the outside of the drum to achieve solid-liquid separation.
Main features
Efficient solid-liquid separation:
Decanter centrifuge can realize efficient solid-liquid separation, effectively remove the floating matter and sludge in the sewage, and ensure the quality of the effluent water.
High degree of automation:
Modern decanter centrifuge is equipped with advanced control system, which can realize automatic operation, reduce labor cost and improve processing efficiency.
Compact structure：
Decanter centrifuge has a compact design, covers a small area, and is easy to install and maintain.
Wide range of application:
Decanter centrifuge is suitable for sewage treatment of various concentrations, and has good separation effect on suspended matter and sludge.
Energy conservation and environmental protection
Decanter centrifuge using physical separation without adding chemicals, reducing the pollution of the environment in line with the green development concept.
Application Advantages
1. Large treatment capacity.
Decanter centrifuge has a large processing capacity, which can meet the demand of water treatment plant for large amount of sewage treatment.
2. Good dewatering effect.
Through the joint action of high-speed rotation and screw pusher, decanter centrifuge can realize efficient dewatering of sludge and reduce the water content of sludge.
3. Continuous operation.
Decanter centrifuge can continuously feed, separate, wash and discharge under full speed operation, which improves the working efficiency.
4. Strong adaptability.
Decanter centrifuge can adapt to the needs of sewage treatment of different concentrations and properties, with strong versatility and flexibility.
Maintenance
In order to ensure the normal operation and prolong the service life of the decanter centrifuge, it is necessary to carry out regular maintenance on it. It mainly includes the replacement of bearings, seals and other wear parts and the filling of lubricating oil. In the maintenance process, attention should be paid to keep the equipment clean and dry to prevent rust and corrosion.
Suggestions for selection
When choosing a decanter centrifuge, the following factors need to be considered：
1. rotational speed:
General decanter centrifuge should be more than 3000 rpm, the higher the rotational speed, the higher the separation factor of the centrifuge, the better the separation effect.
2. Material:
Different materials, wear resistance, corrosion resistance and other physical and chemical indicators are not the same, should be based on the nature of the sewage treatment to choose the right material.
3. Differential speed control:
the higher the precision of differential speed, the better the adaptability of the material, so straight to choose the equipment with high precision of differential speed.
4. L/D ratio:
The larger the L/D ratio of decanter centrifuge, the larger its processing capacity, the smaller the moisture content.
5. Control system:
Should choose the equipment with automatic programming control, in order to improve work efficiency and reduce labor costs.
Decanter centrifuge has a wide range of application prospects and important value in the water treatment plant. By understanding the main features of its working principle, application advantages and maintenance and other aspects of knowledge, you can better grasp its application in wastewater treatment, to provide a strong guarantee for the efficient operation of water treatment plants.