Presentation on “Ecology and People’s Health”

“Ecology and People’s Health”

• Work performed:
• Egamberdiyeva Shaxnoza

Sources of water pollution

• Effluents,
• Domestic waste water,
• Radioactive substances,
• Thermal pollution,
• Lack of aged water pressure.

Effluents

• Wastewater industries pollute fresh water. The same applies to the settlements, which also pollute the water. As a result of this contamination completely change the physical properties of water (the temperature decreases transparency, there are color, taste, smell). There are floating substances found on the surface of water in the bottom sediment settles. The composition of water is completely changed: increased content of organic and inorganic substances, there are toxic substances, reduced oxygen content, changing the active reaction "environment and others. Changes occur also in qualitative and quantitative bacterial composition, occurring bacteria Such water is unfit for drinking. It not even suitable for technical purposes, of course, fishery purposes.

Domestic waste water

• The best known source of water pollution, which has traditionally paid the main attention is domestic (or municipal) waste water. Water consumption cities usually estimated based on the average daily water consumption per capita in the U.S. at about 750 l and that includes drinking water, cooking and personal hygiene for household plumbing devices as well as for watering lawns and lawns, firefighting, street cleaning and other urban needs. Almost all of the used water goes into the sewer. Since the day the waste water enters the huge volume of feces, the main task of urban services for the processing of sewage treatment plants in reservoirs is removing pathogens. Repeated use of inadequately treated human waste water they contain bacteria and viruses can cause intestinal diseases (typhoid, cholera and dysentery), and hepatitis B and polio.

Radioactive substances

• Exposure to toxic metals. These toxic metals like mercury, arsenic, cadmium and lead, too, have a cumulative effect. The result of the accumulation of small doses can be the same as when receiving a single large dose. Mercury contained in industrial effluents, is deposited in the sediments of silt in rivers and lakes. What living in the provinces anaerobic bacteria transform it into toxic forms (eg, methylmercury), which can lead to serious injury of the nervous system and brain of animals and humans, and cause genetic mutations. Methylmercury - volatile substances released from the sediment, and then with water ingested fish and accumulates in the tissues. Despite the fact that the fish do not die, people who ate contaminated fish this can poison and even die. Another well-known poison, which come into dissolved in streams is arsenic. It was discovered in a small but quite measurable amounts of detergents containing phosphates and soluble enzymes, and colors for coloring cosmetic napkins and toilet paper. Since industrial effluents into the waters fall as lead (used in the manufacture of metal products, batteries, paints, glass, gasoline and insecticides) and cadmium (which is used mainly in the manufacture of batteries).