Sand Filters System Removes Suspended Solids in Water

Sand filters are composed of FRP tanks as the vessel and sands with filter material to eliminate the suspended solids from the water. It is the basic and important system for water treatment. It using single-size filtration media to capture all suspended solids in the sands and enable the following water treatment smooth running. It can help to extend membrane filtration system equipment service life. But the sand filters can not removes the sales and non-organic impurities, it is commonly used combined with softening system or activated carbon system.

A multimedia filter system structure.
  • Filter Tank. Our FRP tanks (including universal FRP tanks and FRP tanks with upper loading and lower discharge port) are popular during multimedia filter system. Stainless steel tanks are available.
  • Media. Sand filter adopts single-size filtration media. You can adjust the sand size to achieve different water quality requirements.ideal size of each granule usually varies from 0.35 mm to 1.2 mm.
  • Water distributors. Upper and bottom distributors may needed in this system. The bottom distributors can enable the stable running of filtering process and backwash process.
  • Multiport control valves. This device can reduce your pipeline placement and make the system stable and smart running. Manual and automatic valves options are provided.

Sand filter system is used as the primary filter system for treating waters with large mounts of suspended matter, which the content is more than 10 mg/L. The source water may be river water, reservoir water, canal water, lake water or gutter water.

The sand water is regarded as the most effective and cost effective system for large particles and organic matters.

Treated Elements

  • Organic matter
  • Suspended matter
  • Colloid

Water Quality

  • Remove turbidity
  • Remove TSS
  • Remove suspended impurities
Working Principle

The unfiltered water is distributed in the top of the sand filter and will slowly sink through the filter bed, leaving the dirt particles from the water behind in the fine pores of the sand. When a certain quantity of water has been filtered and the sand has reached a certain degree of pollution, the sand filter should be start backwashing system. The multiport control valves can be manual or automatically control the backwashing system start or closed. During the backwashing, the water enters the tank from the bottom and the pores enlarge upon and the dirt is washed from the sand again. Then the dirt is discharged together with the backwash water. As a result, the sand recovers its filter performance.

The working process of sand filter in water treatment.
  • Pre-filtration of Disinfection equipment.
  • Preparation for ultra and RO filtration.
  • Recirculation system.
  • Rinse water processes.
  • Irrigation system.
  • Basin water filtration.
  • Ground water filtration.
  • Waste water treatment