What are the common water pollutants?

Because human life or production activities have changed the physical, chemical or biological properties and components of natural water, thus affecting the utilization value of water or endangering human health, it is called water pollution. Under natural circumstances, the quality of natural water often changes, but this change is a natural phenomenon, not water pollution. Common water pollutants are:

(1) Pathogenic microorganisms, such as typhoid, dysentery, Vibrio cholerae, etc. , causing the prevalence and spread of infectious diseases.

(2) Plant nutrients, such as nitrogen, phosphorus and potassium. , resulting in eutrophication of water quality, so the water quality deteriorates;

(3) Inorganic salts, such as acid, alkali, salt and other inorganic compounds enter the water body, affecting the water quality of life, production and agriculture;

(4) Various oils affect the sensory characteristics of water, hinder the reoxygenation ability of water and destroy the self-purification ability of water;

(5) Toxic chemicals, mainly heavy metals and refractory organics, such as mercury, cadmium, lead, chromium, arsenic, selenium, vanadium, aragonite, organic chlorides, aromatic amines and polycyclic organic compounds;

(6) radioactive substances.