Presentation on “Ecology and People’s Health”

Thermal pollution

• The temperature of water used in thermal power plants for cooling steam rises by 3-10 ° C, and sometimes up to 20 ° C. The density and viscosity of the heated water different from those of colder water makes the pool, so they shuffled slowly. Warm water cooled or around the place of discharge, or mixed flow, current down the tech? Niya River. Powerful power noticeably heated water in rivers and bays, where they are located. In the summer, when demand for electricity for air conditioning is very large and its production increases, these waters often overheat. The concept of "thermal pollution" refers to such cases as excess heat reduces the solubility of oxygen in water, accelerates the rate of chemical reactions and thus affects the lives of animals and plants in the intake basins. There are striking examples of how the resulting increase in water temperature the fish died, there were obstacles to migration, rapidly multiplied algae and other lower weeds occurred late seasonal changes in the aquatic environment. However, in some cases, increased catches of fish continued growing season and were seen more favorable outcomes. Therefore, we emphasize that a more correct use of the term "thermal pollution" should have much more information about the impact of additional heat in the aquatic environment in each location. Accumulation of toxic organic substances. Stability and toxicity of pesticides ensure success in the fight against insects (including mosquitoes), various weeds and other pests that destroy crops. However, it was shown that pesticides are also environmentally harmful substances, so that accumulate in various organisms and circulating within the food or trophic, chains. Unique chemical structure of pesticides not amenable to conventional processes of chemical and biological decomposition. So when plants and other living organisms, treated with pesticides, consumed animals, toxic substances accumulate and reach high concentrations in their body. As the larger animals eat smaller ones, these substances are at a higher level trophic chain. It occurs both on land and in the waters.