What is a Shallow Sand Filter?
A shallow sand filter is a water treatment filtration device primarily used to remove suspended solids, colloids, silt, and other impurities from water through sand bed filtration. Below is a summary of its key features and working principles:
- Basic Structure
- Filter Media: Typically uses quartz sand (particle size 0.5–1.2 mm), with a shallow bed depth (usually 0.5–1.5 meters), hence the name "shallow."
- Tank Material: Often made of fiberglass, stainless steel, or carbon steel, with a compact design and small footprint.
- Water Distribution System: Equipped with a uniform top inlet distributor and a bottom collector to ensure even water flow.
- Working Principle
- Filtration Stage: Raw water flows in from the top, passes through the sand bed, and impurities are trapped on the sand surface or in the gaps, while clean water exits from the bottom.
- Backwash Stage: When the pressure drop or time reaches a set value, the system automatically initiates backwashing (often assisted by air scouring) to flush out trapped impurities and restore filtration efficiency.
- Key Features
- High Efficiency & Energy Saving: The shallow sand bed reduces flow resistance, and backwashing consumes less water (about 30–50% of traditional sand filters).
- Modular Design: Multiple units can be connected in parallel for flexible capacity, suitable for high-flow applications.
- Automated Control: Often uses PLC control, supporting automatic backwashing triggered by pressure, time, or water quality.
- Applications
- Industrial Water Treatment: Cooling water, pretreatment, wastewater reuse.
- Municipal Water Supply: Turbidity removal, replacing conventional rapid sand filters.
- Agriculture/Landscaping: Irrigation water, swimming pool purification.
- Seawater Desalination Pretreatment: Removing suspended solids to protect downstream membrane systems.
Due to its energy efficiency and compact design, shallow sand filters are widely used in modern water treatment systems, especially in space- and energy-sensitive applications.
Contact Us Today for a Tailored Solution!
Julie
Email: sales@filtrationchina.com
Mobile / WA / WeChat / Line / Viber: +86 159 2865 0174
