Whenever talk of contaminated water gets, After that, the word "disease" also comes to mind.

Water contamination as a biological contamination (the presence of pathogenic microbes), either as chemical contamination (with chemical elements and compounds), or in other forms, diseases and various disorders, including microbial, Viral and parasitic in humans creates.

One of the most dangerous substances in water is nitrate, which is one of the main carcinogenic factors, especially stomach cancer. Despite these problems, water purification is necessary due to various types pollution.

Drinking contaminated water as well as washing hands and body and containers as well as swimming with contaminated water can also cause several problems, such as jaundice, cholera, skin and nervous disorders and even cancer in humans. Everyone can be affected But babies, children, the elderly, and especially those with a weak immune system, Are more likely to become sick due to water contamination.

• Types of water pollution

• Physical pollution:

Substances such as fat, oil, and colored materials, in addition to increasing COD, increase the pollution burden of pathogenic microorganisms in aquatic environments, and by creating a thin layer on the surface of the water and creating an unsuitable landscape, preventing photosynthesis or the oxygenation of water Gets

• Chemical pollution:

The rise in COD levels due to the use of certain chemicals results in the consumption of water-soluble oxygen and the elimination of conventional aquatic bioassays. Also, PH changes can aggravate the ecological balance of the aquatic environment and accelerate chemical interactions. The effects of the addition of heavy metals such as chromium, nickel, lead and radioactive waste, and ... to water are obviously visible in the creatures of the food pyramid, like humans.

• Biological contamination:

Due to the evacuation of organic matter in water and the increase in the amount of BOD in the sewage, oxygen is consumed in the water and anaerobic microorganisms grow in such an environment, so after a while, the unpleasant smell of hydrogen sulfide, methane and ammonia from watered out And the color of the water is also darkening. The biological contamination measurement is a group of bacteria called the Ecoli.