How To Remove Biological Impurities From Water?

Removing biological impurities is to ensure that the water coming into your home is safe and clean. Using a filter system can help you to protect yourself and your family from these health risks, associated with biological impurities from water.

What Are Water Impurities, And Why Do They Matter?

Water impurities are any foreign substance that is present in the water. These can include bacteria, parasites, viruses, and harmful chemicals such as lead or arsenic.

Biological Impurities In Water

Biological impurities in water are caused by microscopic organisms, such as bacteria and algae. These tiny organisms can contaminate drinking water and cause health problems if not removed properly. In many cases, the presence of biological impurities can be identified by smell or taste; however, testing is necessary to determine their actual presence in a sample of water.

Common Impurities In Water

  • Bacteria
  • Protozoa
  • Algae
  • Fungi
  • Viruses
  • Parasites
  • Worms and other microorganisms

Causes Of Biological Impurities In Water

Contamination From Agricultural Runoff: Fertilizers, pesticides, and other chemicals used in agriculture can leach into water sources and encourage the growth of bacteria, algae, and other microorganisms.

Sewage Leaks Or Overflows: Many water systems have aging infrastructure that can create openings for sewage to enter a water supply, leading to contamination.

Natural Sources: Lakes, rivers, and other natural water sources can also become contaminated with biological impurities due to runoff from forests, animal waste, and decaying plant matter.

Removing Biological Impurities

Boiling: Boiling water is also an effective way to remove biological impurities, as it kills bacteria and other organisms. However, boiling does not remove solid particles or chemicals from the water.

Reverse Osmosis: This process forces water through a semipermeable membrane that filters out particles as small as 0.001 microns, including bacteria.

Filtration: Various types of filters can be used to remove particles as small as bacteria from water. These filters can range from simple cloth strainers to machines that use ultraviolet light or ozone gas to kill microorganisms.

Chlorination: Adding chlorine to water kills harmful bacteria, viruses, and other microorganisms, making it safe for human consumption. This method is used to reduce the risk of waterborne diseases by killing off harmful bacteria and other pathogens.

Ozonation: Ozone gas is used to kill bacteria and other microorganisms in water. This process is often used in commercial-scale water treatment plants. Ozone is a powerful oxidizing agent that destroys microorganisms on contact.

Bromine: It is a safer alternative to chlorine, as it does not corrode pipes or have an unpleasant smell.

Ultraviolet (UV) Light: It is a popular method used to remove biological impurities from water. This involves passing the water through a UV lamp which uses radiation to kill off any microorganisms present in the water.

Distillation: This method of filtration involves boiling the water and collecting the steam. The steam condenses back into the water, leaving behind most impurities. This method is effective at removing bacteria, parasites, and other microorganisms from the water.

Types Of Impurities In Water

Biological Impurities: Microorganisms exist naturally in water and can cause serious health problems if ingested, including which can cause diseases and waterborne illnesses.

Chemical Impurities: Chemical impurities occur when industrial and agricultural chemicals enter the water supply from runoff and pollution. These chemicals can be toxic to human health if consumed.

Physico-Chemical Impurities: These are the inorganic substances like sand, silt, dirt, heavy metals, and salts present in water which can affect its taste, color, and odor.

Suspended Solids: Suspended solids are microscopic particles that can make the water cloudy and murky. They can also reduce the amount of available oxygen in the water, making it difficult for aquatic life to survive.

Organic Matter: Organic matter includes decaying plant and animal material, which can release toxins into the water. This can cause illnesses in humans and animals if ingested.

Radioactive Substances: Radioactive substances, such as uranium and radon, are found in some groundwaters and can cause serious health problems if consumed.

Nutrient Pollution: Excess nutrients from fertilizers, sewage sludge, and manure can cause algal blooms, which can reduce oxygen in the water. This can harm aquatic life, increase the cost of drinking water treatment and lead to beach closures.


What Water Filter Removes The Most Biological Contaminants?

Reverse osmosis is the best of all filters for removing impurities from water.

Does Boiling Water Kill All Impurities?

Boiling removes the majority of biological impurities, but they cannot be completely purified.

What Are The Examples Of Chemical Impurities In Water?

Chlorine Compounds: These are compounds that are added to water when it is treated with chlorine, such as chlorinated hydrocarbons and chloramines.

Heavy Metals: This includes lead, mercury, arsenic, and other metals that can be found in the water after passing through industrial areas or runoff from landfills.

Pesticides: These are chemical compounds used to protect crops and livestock, but can contaminate drinking water when they seep into groundwater.

Pharmaceuticals: These are medicines that have been flushed down toilets or disposed of improperly, which then find their way into water supplies.

Volatile Organic Compounds (VOCs): These are chemicals that evaporate easily and can be found in water supplies after passing through an industrial area.

Nitrates: These are nitrogen-based compounds that come from agricultural runoff, sewage treatment plants, and other sources.

Radionuclides: These are radioactive particles that can occur naturally in water, but can also be introduced through nuclear power plants or waste sites.


No matter what method is used, it is important to regularly maintain the filtration system to ensure that it continues to function properly and effectively remove impurities from the water. Regular testing should be done to monitor the quality of the water, as a malfunctioning system or an improperly maintained filter can actually cause more harm than good. With proper maintenance and regular testing, however, these methods can be used to ensure that the water is safe, clean, and free of biological contaminants.

Leave a Comment