Extra information about liquid filtration

What Is liquid filtration?

It is the process in which solid matters or unwanted solutes are removed from a liquid using a filter membrane or technique. The filtered liquid obtained through this process is known as filtrate while the solids separated from the original liquid are called residues. A variety of techniques are used for this purpose depending on the type of source liquid that requires filtration and the type of filtered liquid needed. Various membrane materials like paper, sand, wood, charcoal, fabric, metal and other items are used for this purpose. Metal, plastic or fabric mesh is used extensively in the first stage filtration. Techniques using gravity, sedimentation, thickeners, clarifiers, pressure, centrifugal force, depth or vacuum are used to filter liquids. Reverse osmosis filtration is used to remove the undesired solutes from a liquid.

Extra information about liquid filtration


The Purpose of Liquid Filtration

Water is the most widely filtered liquid. It is needed for drinking and many other purposes. There are very few places where pure water that does not require filtration before drinking is available. At most places, water cannot be used for drinking without some type of filtration and treatments. Purifying the water using chemicals, electricity and other things can be more expensive. In some applications, simple filtration is sufficient while in other applications further purification is needed. Liquids must be filtered to remove solid matters, chemicals, unwanted solutes and other substances. The type and level of filtration depends on what type of end result is desired. Simple filtration may be used in the first step to purify the source liquid before other purification processes are used. It helps avoid use of heavy purification in later stages. Initial filtration minimises the use of chemicals and other substances in later stages of purification.


What Type of Liquids Require Filtration?

Contaminated or mixed water, chemicals, bodily fluids, mining slurries, juices of farm produces, oils and beverages are some of the liquids that require filtration. Each type of liquid requires a different filtration method depending on the level of contamination or mixed solutions.


The liquid viscosity, sizes of particle solutes, and the type of filtration membrane or technique are some of the factors that affect the end result. Use of contaminated liquids affects the processes where these liquids are used. It can cause scales, rust, jamming, pollution, machine defects or health problems. A very high level of multistage filtration and purification treatments are needed for liquids used in the food processing industry.