Reliable Sand Filtration for Industrial Water Treatment

1. Core Functionality

A sand filter is a physical filtration system that removes suspended solids from water by trapping them within a multi-layered sand bed. It offers an effective and economical solution for reducing turbidity and particulate matter before or after chemical or biological treatment processes.

2. Filtration Efficiency

Sand filters achieve high filtration efficiency for particles down to 20–50 microns. With proper media selection and flow rate control, the system ensures consistent performance, maintaining clarity in treated water and protecting downstream equipment.

3. Materials of Construction

• Filter Housing: Stainless steel (SS304/SS316), carbon steel with anti-corrosion coating, or FRP for lightweight and corrosion resistance.

• Filter Media: Natural quartz sand, anthracite, garnet for multi-layer filtration.

• Internal Nozzles and Drains: ABS, PVC, or stainless steel for long-term durability.

• Valves and Pipes: Brass, stainless steel, or PVC depending on application and fluid type.

4. Control and Automation Options

Sand filters can be controlled in multiple modes:

• Manual Operation: Using hand-operated valves for simple installations.

• Semi-Automatic: Backwash initiated by timer or operator.

• Fully Automatic: Controlled by PLC with differential pressure sensors and motorized valves, reducing operator intervention and ensuring efficiency.

5. Installation and Maintenance

Installation is straightforward—sand filters can be installed in-line or as part of a modular system. Routine maintenance includes periodic backwashing and occasional media replacement. Visual inspection and pressure drop monitoring help ensure optimal performance.

6. Environmental and Economic Benefits

• Reduces total suspended solids (TSS) without chemicals

• Minimizes waste discharge

• Extends lifespan of downstream membrane or equipment

• Low energy consumption

• Sustainable solution with long service life

• Adaptable to various industries and water qualities

FAQ

1. What is the typical lifespan of the filter tank?

• Depending on the material, 10–20 years or more with proper maintenance.

2. How do I know when to perform backwashing?

• Usually triggered by a pressure drop of 0.1–0.15 MPa or based on a timer.

3. Can sand filters be used for seawater applications?

• Yes, FRP or SS316 materials are suitable for seawater corrosion resistance.

4. What size particles can a sand filter remove?

• Typically 20–50 microns; finer filtration is possible with dual-media configurations.

5. Are sand filters suitable for oily wastewater?

• Not ideal alone—should be combined with oil separators or coalescers.

6. Do sand filters need a concrete base?

• Yes, especially for heavy steel units, to ensure stability.

7. Can I operate the filter continuously?

• Yes, except during short backwash intervals.

8. How much water is needed for backwashing?

• Around 2–3% of daily  treated volume, depending on system design.