Environmental-Pollution.ppt

1、Environmental Pollution,Introduction to pollution problem,Nowadays,environmental pollution is a very serious problem that the whole world is facing. Industrial development causes a serious environmental pollution. Now ,air, water, soil have been polluted in varying degrees. it mainly caused by waste

2、 products released from artificial substances and industrial products .,Our sky is full of dense smoke. Our rivers are polluted into all colors . Our fields are so infertile that plants cant grow. Facing such situations，how shuld we do？Knowing kinds of pollutions will be helpful for us to improve th

3、e environment.Although its difficult to solve, we can try our best to reduce pollution.,The examples of pollution problem,Nowadays , various pollutions are on the increase in our country. The pollutions had many serious effects on our life. In order to solve the problem, I think our teenagers should

4、 have a deep understanding of the several typical pollutions.,Air Pollution,The first picture , in practice ,what shuts out the sun isnt dark clouds but the black smoke. The smoke comes from some industrial production and covers the blue sky completely. The second picture , in the western of our cou

5、ntry, some industrial factories bring unpleasant smell, black smoke and flour dust. These children who are going to home after school have to cover their mouths when they pass through the factories.,Now ,our country advocates low carbon lifestyle ,however, it is difficult to resist carbon dioxide em

6、issions in every way of life. Its reported that global emissions of carbon dioxide every day on average 0.912 tons in 2010.Large amounts of carbon dioxide result in the greenhouse effect. Then global warming is coming. At the north pole, some huge ice has been melting ,and the sea level has been on

7、the rise. Many of the animals live there may lose the habitat, like polar bears.,Water Pollution,According to the environment department monitoring, there are at least one hundred million tons of sewage without treatment, then directly discharged into the water everyday in Chinas urban. The life sew

8、age what contains a large number of nitrogen ,phosphorus, potassium and other harmful chemical discharges into the rivers .It leads to eutrophication .The eutrophication can speed up the death of fish.,A fact of life has to be mentioned, based on the statistics ,1.1 billion people lack access to saf

9、e drinking water in the world. Each year 5 million people were killed by it, and one child died every 15 seconds from it.,White Pollution,Suppose that we live without the plastic products, what our life will be like ? But the plastic products what are essential to our life have polluted the earth se

10、riously. There is data shows that plastic products for the degradation time is at least 200 years, and the speed of environment friendly biodegradable plastic degradation approximately also takes 10 years.,Pollutants into water containing more than local value and self-purification capacity of water

11、 to make the water damage, destruction of the original nature and purpose of the water, known as the Water Pollution,Industrial wastewater containing pollutants are complicated, difficult to purify not only in the water, and the handling is also more difficult. Therefore, the most serious water poll

12、ution caused by the industrial, which is the main reason to cause water pollution,In recent years the use of pesticides, fertilizers increased, the use of pesticides and fertilizers, the vast majority of the remaining residues in the formation of soil and floating in the atmosphere。 by rainfall, sur

13、face runoff washed into surface water and infiltration of surface water pollution。,City pollution is due to city population is concentrated, urban sewage, garbage and exhaust cause of water pollution. City pollution, water pollution is sewage, it is daily life for a variety of sewage。,Gaseous pollut

14、ants in the atmosphere the average residence time of as little as a few minutes up to several decades, over a hundred years. Atmospheric pollutants are generally divided into two categories: a (native) of pollutants, ie directly from the source of pollution into the atmosphere; two (secondary) pollu

15、tants, thermal or photochemical reaction of a pollutant in the atmosphere the product. The latter are often more harmful. The air pollution comes mainly from human life and production activities, the anthropogenic sources of pollution of the atmosphere There are three main,Daily needs, people often

16、to the atmospheric emissions of soot and SO2, with a large amount of widely distributed, emissions from high and low, and its harmful consequences can not be ignored。,Various types of chemical plant emissions to the atmosphere irritating, corrosive, odor or stench of organic and inorganic and inorga

17、nic gases。,Transport exhaust emissions. In some developed countries, air emissions from vehicles already constitute a major source of pollution of air pollution 。,Pollution of the soil, generally through the conversion of the air and water pollution, they can work alone, and can also overlap and cro

18、ss, belongs to a class of point pollution. With the modernization of agriculture, especially in raising the level of the agricultural chemical, scattered large quantities of chemical fertilizers and pesticides into the environment, soil subjected to more and more opportunities for non-point pollutio

19、n, the extent of more and more serious. Under the influence of soil erosion and wind erosion, etc., the contaminated area is constantly expanding.,Domestic sewage and industrial waste water containing nitrogen, phosphorus, potassium, and many plants need nutrients, so the reasonable use of Sewage Ir

20、rigation, general yield. Sewage also contains many toxic heavy metals, phenols, cyanide and other harmful substances, if the sewage has not been necessary processing directly used for irrigation, toxic and hazardous substances in the sewage to farmland, contaminated soil.,Harmful gases in the atmosp

21、here is the main industry in the discharge of toxic exhaust pollution of surface, the soil will cause serious pollution.,The application of fertilizer is an important measure of agricultural production, unreasonable use, can also cause soil pollution,Pesticides can prevent disease, insects and weeds

22、, if used properly, can ensure crop yield, but it is a great danger of soil contaminants, improper application can cause soil pollution,Solid waste refers to the human discard the solids and sludge in the production and living, such as straw in the mining industry waste rock, tailings, coal gangue;

23、industrial production of blast furnace slag, steel slag; agricultural production, human and animal fecesradioactive waste; nuclear industry and some of the medical unit; municipal solid waste, and so on. If not promptly removed, will inevitably cause serious pollution of the atmosphere, soil, water,

24、 causing mosquitoes to breed bacteria, the disease spread rapidly, endangering human health.,Industrial waste and municipal solid waste is a solid pollutants of soil 。,Solid waste into the water, but also affect the survival of aquatic life and water use . Waste pile or landfill, the flooding by the

25、 rain pouring, oozing fluid and filter drain will pollute land, rivers, lakes and groundwater。,Solid pollution,The Categories of Environmental Pollution,There are many kinds of environmental pollution in the society. But generally speaking, The environmental pollution can be divided into three categ

26、ories such as air pollution, water pollution and solid waste pollution. There are also many other kinds of pollution like noise pollution, heat pollution, Photochemical pollution, soil pollution and so on. Today we mainly introduce these three parts of pollution.,Air pollution,As implied in the name

27、, air pollution means what human activities do harm to the sky. With the development of society and the economy, the degree of the air pollution is on the increase. In the field of industry, factories exhaust emission to the sky everyday. Emission without being dealt with does great harm to the sky

28、especially smelting plants, chemical plants And pharmaceutical factories. In the field of human life, many citizens use coal and burn garbage, thus creating so much emission ,which also does great harm to the air. Cars also create emission. The popularity of private cars is also a great threat to th

29、e sky.,Water pollution,Water is used in homes, in farming, in manufacturing and every part of human life and human activities. The water used by people comes from oceans, lakes, rivers and streams. Nowadays many water sources are becoming polluted. People throw garbage into the water. Factories dump

30、 waste materials into the water. Many factories pull industrial waste water into the rivers and lakes. All these human activities are speeding up the pollution of water.,solid waste pollution,Solid waste pollution can be produced in many fields. If people throw what they dont like to have, these thi

31、ngs can be described as solid waste pollution. Nowadays the most notable solid waste pollution is the white pollution. White pollution mainly comes from food packaging, foam filled packaging, fast food box, agricultural film and so on. With the high pace of life, social life is developing towards po

32、sitive facilitation and healthy. In order to adapt to this demand, disposable foam plastic lunch boxes, plastic bags, chopsticks, cups and other frequently comes to peoples daily life. These are easy to use and cheap, which gives peoples life a lot of convenience. But on the other hand, the packagin

33、g material in use is often abandoned, which cause white pollution” Now it becomes a great environmental problem.,How to solve the pollution problem ?,For todays situation of environment pollution. Everyone has responsibility to protect our homeland and everyone should take actions to stop the pollut

34、ion.,What can we do to save our environment?,steps,enterprise,individual,government,government,Devise a code of rules for giving some industry a legal standard Strengthen propaganda to improve the public moral standards Set environmental monitoring center Increase capital input in environmental governance r