The harm of sewage to humans

1. Can cause acute and chronic poisoning phenomena. After water bodies are contaminated with toxic and harmful chemicals, poisoning may occur through drinking water or the food chain. Famous diseases such as Minamata disease and painful pain are caused by water pollution.

2. Has carcinogenic effects. Certain carcinogenic chemicals, such as arsenic, chromium, nickel, beryllium, aniline, benzo (a) pyrene, and other polycyclic aromatic hydrocarbons and halogenated hydrocarbons, can contaminate water and be adsorbed by suspended solids and sediment. They can also accumulate in aquatic organisms. Long term consumption of water containing these substances or consumption of organisms with such substances in their bodies (such as fish) may trigger cancer.

3. Causing infectious diseases. The pollution of water bodies by biological pollutants such as human and animal feces may cause bacterial intestinal infectious diseases such as typhoid fever, dysentery, enteritis, cholera, etc; Common viruses in the intestine, such as spinal gray matter viruses, Coxsackie viruses, and infectious hepatitis viruses, can cause corresponding infectious diseases through water pollution.

4. Generate indirect impacts. After water pollution, the sensory characteristics of water will often deteriorate. For example, some pollutants at a certain concentration, although not directly harmful to human health, will cause water odor, heterogeneous color, display foam and oil film. Obstructing the normal use of water bodies.

Substances such as copper, zinc, and nickel can inhibit the growth and reproduction of microorganisms at certain concentrations, thereby affecting the decomposition and biological oxidation of organic matter in water, making it highly self purifying. The decrease in body moisture affects the hygiene of the water body. Water pollution not only seriously endangers the ecosystem, but also causes serious economic losses.

The impact of major pollutants in water bodies:

Lead: Harmful to the kidneys and nervous system, highly toxic to children, and carcinogenic has been proven.

Cadmium: Acute damage to the kidneys.

Arsenic: causes harm to the skin, nervous system, etc. Its carcinogenicity has been proven.

Mercury: It causes significant harm to the human body, with the main organs being the kidneys and central nervous system.

Selenium: High concentrations can harm muscles and the nervous system.

Nitrite: causes cardiovascular diseases, with a significant impact on infants (blue baby syndrome) and is carcinogenic.

Total trihalomethanes: Chloroform has a significant impact on health, and bladder cancer often occurs in terms of carcinogenicity.

Trichloroethylene (organic matter): Inhalation in excess can reduce central nervous system and heart function, and long-term exposure is harmful to the liver.

Carbon tetrachloride (organic matter): It has a wide range of effects on human health, is carcinogenic, and has a significant impact on liver and kidney function.