What is Filtration?

What is Filtration

Filtration is happening constantly around us in our day to day life. Sometimes we actively do it, and some times it is just happening. You get up in the morning and switch on your water purifier, water is being filtered. You prepare your tea and you filter it to remove the tea leaves. Your juicer filters the juice for you. When you are driving, the automobile filters are operational and when you are sitting in your home or office, air filters are protecting you from the pollutants.

For our article, we’ll focus on industrial filtration. So, what exactly is the filtration from industrial perspective. In general, it is a process of separation or removal of solids from fluids, wherein either fluid is to be purified or solids are to be recovered. But in certain situations, you also separate one type of fluid from another, like removal of oil from water and removal of humidity from the process fluids. You always need some sort of filter medium to make the process happen. There are a huge variety of filter media available in the industry, they are selected on the basis of the fluid to be filtered and the result that is desired.

Here is How Some Other Websites Define Filtration:

  1. “Filtration, the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles. Either the clarified fluid or the solid particles removed from the fluid may be the desired product.”- Source: Encyclopedia Britannica
  2. “Filtration is any of various mechanical, physical or biological operations that separate solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.” – Source: Wikipedia
  3. “Filtration is the process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of some substance, called a filter. ” – Source: Lenntech

Important Terminologies Associated with Filtration:

  • Filter Element: Filter Element is a component built from the filter media. It is the most important part of any filtration system since it performs the task of filtration.
  • Filter Media (Medium): This is the material from which filter elements are produced. In various situations, filter media is directly used in the filtration systems without moulding them into an element.
  • Filtrate: Simply put, the fluid that comes out after being filtered is called filtrate.
  • Filtration Area: The area of a filter element that is exposed to make contact with the fluid to be filtered.
  • Micron Rating: Mathematically speaking, 1 micron = 0.00004 inch; micron is the short form of micrometer. In the filtration industry, micron represents the smallest size of particle that can be retained or removed by a filter.
  • Filter Efficiency: Efficiency represents the accuracy of filtration that can be achieved by a given filter element. For instance, if a filter element of 5 micron rating is capable of removing 98% of the particles of sizes 5 micron and above, it is said to be 98% efficient.
  • Differential Pressure: The difference between the pressure of the fluid at the inlet and outlet of the filter is called differential pressure. As a filter retains more and more particles, the differential pressure increases.

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