Product Information
In the grit removal process at wastewater plants, discharging the pumped grit-water mixture directly not only increases the sludge treatment load but also pollutes the environment. The LSF sand-water separator is an efficient Screw Sand-Water Separator. Using spiral conveying and gravity settling, it thoroughly separates inorganic grit from organic sludge. The separated sand has low moisture content and can be loaded for disposal directly, while the separated water flows back to the front end of the plant, achieving water recycling.
Get a QuoteScrew Sand-Water Separator | Grit Dewatering Unit |LSF Sand-Water Separator
Working Principle
The grit-water mixture enters through the inlet on one side and falls into an inclined U-shaped trough. Heavier inorganic grit quickly settles to the bottom, while the water carries lighter organics out through the overflow weir at the top. The screw shaft at the bottom of the trough rotates slowly, pushing the settled grit up along the inclined trough. During this lifting process, this Screw Sand-Water Separator not only squeezes out excess water but also washes off organic matter through friction between the sand particles, ensuring the discharged sand is dry and clean.
Application Fields
1.Municipal plant grit chambers: dewatering and separation of grit-water mixtures from vortex or aerated grit chambers.
2.Industrial wastewater pre-treatment: separating heavy particles from water in steel and petrochemical wastewater.
3.Stormwater pumping stations: clearing sediment at the bottom of pump pits during flood season with sand-water separation.
4.Combined sewer overflow points: intercepting and separating coarse sand and debris from stormwater.
FAQ
Q1: What is the difference between this Screw Sand-Water Separator and a standard sludge-water separator?
A: The main difference is the material processed. This equipment is specifically designed for heavy inorganic grit, typically using spiral settling and drainage structures without chemicals. Sludge-water separators (like screw presses or centrifuges) deal with organic sludge and require chemical flocculants.
Q2: Does the screw shaft of the LSF unit wear out easily?
A: Not easily. Since it handles hard inorganic grit, the spiral blades and the U-trough liner are usually made of highly wear-resistant materials such as high-strength nylon, UHMWPE, or hardfacing layers, resulting in a long service life under normal use.
Q3: Is the moisture content of the separated sand high?
A: No. Due to the squeezing action of the inclined screw and gravity drainage, the separated sand usually has a low moisture content with almost no free water dripping, allowing it to be hauled away directly by dump truck or grab bucket.