LSF spiral sand-water separator

• Product Overview

The spiral sand-water separator is an eco-friendly device designed and manufactured by our company for separating and cleaning sand-water mixtures. Primarily used in conjunction with sedimentation tanks (such as cyclone sedimentation tanks and aeration sedimentation tanks), it aims to further separate solids from liquids in the discharged sand-water mixture. During the separation process, the sand particles are flushed to reduce the organic matter they carry, yielding relatively clean sand. As a common auxiliary unit in wastewater pretreatment systems, it enhances the overall efficiency of sand removal and facilitates subsequent disposal of the sand particles.

• Structure and Working Principle

1. Core structural composition

The main body of the device is typically a U-shaped groove structure installed at an incline, primarily comprising:

• The drive unit is located at the discharge end of the equipment, which is equipped with a shaft-mounted speed reducer to provide power for the screw shaft.
• Screw shaft and blades: Core working components. The screw shaft can be designed in either shafted or shaftless configurations; the blades are continuous and responsible for conveying and lifting sand particles.
• U-shaped separation tank and filter screen: The tank is used to contain the mixture and perform sedimentation separation; the upper part is usually equipped with a screen to intercept sand particles and drain water.
• Feed inlet and overflow weir: The feed inlet is located at the lower position of the tank to receive incoming material; the overflow weir is situated at the upper position of the tank for discharging the separated supernatant.
• Rinsing system (optional): Equipped with spray pipes for water flushing during sand particle lifting.
• Sand hopper and discharge port: located at the top of the equipment, used to discharge the dehydrated sand particles.

2. Working Principle
3. Settling and Filtration: The sand-water mixture enters the lower section of the U-tube through the feed port. Under the influence of gravity, the sand particles rapidly settle to the bottom of the tank, while the water and fine organic suspended solids remain in the upper layer or pass through the screen gaps.
4. Conveying and Dewatering: The settled sand particles are captured by the rotating spiral blades and conveyed upward along the inclined trough bottom. During the conveying process, the sand particles are continuously turned by the spiral while undergoing dewatering, with the interstitial water being separated and returned to the trough.
5. Rinsing and Discharge (if equipped): When the sand particles are raised to near the discharge port, an optional rinsing system can spray them to further remove surface-attached organic matter. The cleaned sand particles are ultimately discharged from the outlet, while the wastewater is returned to the front end of the treatment system via the overflow weir.

• Core technical features

1. Functional integration: Combines separation, conveyance, dehydration (and optional flushing) into a single continuous process.
2. Designed to improve sand quality, this process reduces organic content and moisture in discharged sand through sedimentation, dewatering, and optional flushing, facilitating transportation and disposal.
3. The structure is relatively simple: the core moving parts are mainly helical shafts, and the mechanical structure is relatively intuitive.
4. Adaptability to various operating conditions: The screw can adopt either shafted or shaftless designs. The shaftless design may help reduce winding risks for materials containing minimal fibers.

• technical parameter

• Main Application Fields

This equipment is primarily designed for scenarios requiring effective sand separation from water and appropriate cleaning.

• Municipal sewage treatment plant: works in conjunction with a cyclone sedimentation tank and an aeration sedimentation tank to treat the discharged sand-water mixture.
• Industrial wastewater treatment plant: Sand removal system for industrial wastewater containing sand from food processing, slaughter, leather, and mineral washing industries.
• Water treatment plant: Raw water intake pretreatment sand removal system.
• Other applications: River dredging, sand and gravel washing, and similar solid-liquid separation scenarios.