Spiral Grit Classifier | Sand and Grit Separator for Wastewater Treatment

Short Description:

The Grit Classifier, also known as a grit screw, spiral sand classifier, or grit separator, is widely used in wastewater treatment plants—especially at the headworks (the front end of the plant). Its main function is to separate grit from organic matter and water.

Efficient grit removal at the headworks significantly reduces wear on pumps and other mechanical equipment upstream. It also prevents pipeline clogging and maintains the effective volume of treatment basins.

A typical grit classifier features a hopper mounted above an inclined screw conveyor. To handle the abrasive nature of the application, the unit is usually constructed with a stainless steel housing and a high-strength, wear-resistant screw.

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Key Features

1. High Separation Efficiency
Capable of achieving a separation rate of 96–98%, effectively removing particles ≥ 0.2 mm.
2. Spiral Transport
Uses a spiral screw to convey separated grit upward. With no underwater bearings, the system is lightweight and requires minimal maintenance.
3. Compact Structure
Incorporates a modern gear reducer, providing a compact design, smooth operation, and easy installation.
4. Quiet Operation & Easy Maintenance
Equipped with wear-resistant flexible bars in the U-shaped trough, which help reduce noise and can be easily replaced.
5. Simple Installation & Easy Operation
Designed for straightforward on-site setup and user-friendly operation.
6. Wide Range of Applications
Suitable for various industries including municipal wastewater treatment, chemical processing, pulp and paper, recycling, and agri-food sectors, thanks to its high cost-performance ratio and low maintenance requirements.

Typical Applications

This grit classifier serves as an advanced solid-liquid separation device, ideal for continuous and automatic debris removal during sewage pretreatment.

It is commonly used in:

✅ Municipal wastewater treatment plants
✅ Residential sewage pretreatment systems
✅ Pumping stations and waterworks
✅ Power plants
✅ Industrial water treatment projects across sectors like textile, printing and dyeing, food processing, aquaculture, paper production, wineries, slaughterhouses, and tanneries

Beverage processing

Dairy industry

Meat Processing

Mining industry

Municipal Wasterwater

Paint factory

Paper Mill

Petrochemicals

Printing and Dyeing

Sewage Treatment

Technical Parameters

Model	HLSF-260	HLSF-320	HLSF-360	HLSF-420
Screw Diameter (mm)	220	280	320	380
Capacity (L/s)	5/12	12/20	20-27	27-35
Motor Power (kW)	0.37	0.37	0.75	0.75
Rotation Speed (RPM)	5	5	4.8	4.8