WHAT IS SAND FILTRATION?
Sand filtration is used to remove suspended substances and floating and dissolved particles.
WHERE IS SAND FILTRATION USED?
You will find sand filtration in several applications, such as old buildings with old piping systems, swimming pools or in wastewater treatment systems.
For membrane filtration technology, this is an excellent pre-filter. The sand filter does not remove bacteria and viruses. For this purpose, we use membrane technologies.
PRINCIPLES OF SAND FILTRATION
Sand filtration is a process in which the treatment of the water is accomplished by the ‘porous’ nature of a sand layer which traps particles in water. Various other physical/biological processes also take place in a sand filter which removes solids and impurities from water (deferrisation, demanganisation, ammonium removal).
Sand filtration is frequently used in groundwater treatment to remove dissolved iron. Iron and manganese in the groundwater are oxidised by aeration and the particle flocs get trapped in the sand filter. As filters remove particles from drinking water, they eventually fill up with trapped debris so it needs to be cleaned to avoid issues like blocking. The sand filters are cleaned by backwashing with air and/or water.