XLC type rotational flow grit separator

• Product Overview

The hydrocyclone sand separator (also known as hydraulic cyclone sand settling tank) is a sand removal and separation device designed and manufactured by our company for wastewater pretreatment. Primarily installed at the inlet of urban sewage treatment plants, industrial wastewater treatment stations, and pumping stations, this equipment utilizes a combination of hydraulic cyclone action and gravity sedimentation to remove dense inorganic particulate impurities (such as sand and gravel) from wastewater. This process effectively reduces the risk of pipeline and treatment unit wear and clogging in subsequent stages.

• Structure and Working Principle

1. Core structural composition

A device system typically includes the following main components:

• Pond structure: Generally cylindrical with a conical base to facilitate sand collection and discharge. Materials may include concrete or carbon steel with anti-corrosion treatment.
• Inlet and vortex generation unit: The tangential inlet pipe directs sewage into the pool wall at a controlled flow rate, creating a rotating current. Some models may be equipped with an axial impeller stirrer to enhance the formation of a stable vortex.
• Sand discharge and auxiliary equipment:

• Sand pump or air lifting device: located at the conical base of the tank, used to lift and discharge the separated sand particles.
• The accompanying sand-water separator is typically a spiral-type unit, designed to further flush and dehydrate the discharged sand-water mixture, yielding sand particles with reduced organic content.
  • Control system: It can realize the control of automatic operation of equipment, timing sand discharge and other functions.

2. Working Principle
3. Circulation separation: After the sewage enters the tank tangentially, it forms a stable horizontal vortex. Under the combined effects of centrifugal force, gravity, and fluid drag, the denser sand particles are thrown against the tank walls and sink along them to the conical bottom.
4. Sand-water separation and discharge: The sedimented sand particles at the bottom are periodically discharged through sand pumps or air lifting devices, and then mixed with a small amount of wastewater into the spiral sand-water separator for cleaning and dewatering, resulting in relatively clean sand residue.
5. Wastewater discharge: The separated sand particles and the wastewater from the sand-water separator are both directed to subsequent treatment units. Lighter organic suspended solids are discharged through the overflow weir at the pool's top with the central upward flow.

• Core technical features

1. Compact footprint: Compared to conventional horizontal sedimentation tanks, the cylindrical design can save space while maintaining comparable treatment capacity.
2. The separation process is continuous: the water flow swirl and sand particle sedimentation can be carried out continuously, which is helpful to realize the continuous sand removal operation.
3. The separation effect on fine sand is good: the action force of the vortex helps to improve the separation efficiency of fine sand (e.g. 0.2mm or more).
4. Sand washing: When used with a spiral sand-water separator, it can flush the discharged sand to reduce the organic matter content in the sand particles.

• Main Technical Parameters

• Typical Application Fields

This equipment may be considered for use in the following pretreatment scenarios requiring removal of heavier inorganic particles from wastewater:

• Municipal sewage treatment plant: the sand removal unit for the pretreatment of domestic sewage.
• Industrial wastewater treatment plant: pretreatment of sand-containing industrial wastewater from food processing, slaughtering, leather, papermaking, etc.
• Sewage system: The initial separation of sediment carried in rainwater or combined sewage.
• Other fields: pretreatment of water intake points in river channels and agricultural irrigation water.