logging in or signing up Acid Rain saravana3 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 838 Category: Science & Tech.. License: All Rights Reserved Like it (1) Dislike it (0) Added: September 30, 2010 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: alhumduallah (12 month(s) ago) excellent Saving..... Post Reply Close Saving..... Edit Comment Close By: kiranmarathe.km (18 month(s) ago) nice Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Slide 1: Members: [ Cheong Jiawei 4D04 ][Douglas Lee 4D06] [Kenny Wong 4D29][Law Chun Yin 4C12] [Yeow Kai Yao 4C34] By M.saravana Kumar Contents : Contents Definition Causes Formation Affected Areas Effects Preventive Measures Definition of Acid Rain : Definition of Acid Rain Precipitation that has a pH of less than that of natural rainwater (which is about 5.6 due to dissolved carbon dioxide). It is formed when sulphur dioxides and nitrogen oxides, as gases or fine particles in the atmosphere, combine with water vapour and precipitate as sulphuric acid or nitric acid in rain, snow, or fog. Causes of Acid Rain : Causes of Acid Rain Natural Sources Emissions from volcanoes and from biological processes that occur on the land, in wetlands, and in the oceans contribute acid-producing gases to the atmosphere Effects of acidic deposits have been detected in glacial ice thousands of years old in remote parts of the globe Causes of Acid Rain : Causes of Acid Rain The principal cause of acid rain is from human sources Industrial factories, power-generating plants and vehicles Sulphur dioxide and oxides of nitrogen are released during the fuel burning process (i.e. combustion) MSN Encarta Formation of Acid Rain : Formation of Acid Rain NOx+H2O+Vapour->H2NO3 SO2+H2O+vapour->H2SO3 Formation of Acid Rain : Formation of Acid Rain When water vapour condeses, or as the rain falls, they dissolve in the water to form sulphuric acid (H2SO4) and nitric acid (HNO3). While the air in cleaned of the pollutants in this way, it also causes precipitation to become acidic, forming acid rain Affected Areas : Affected Areas Canada Acid rain is a problem in Canada Water and soil systems lack natural alkalinity such as lime base Cannot neutralize acid Canada consists of susceptible hard rock such as granite Do not have the capacity to effectively neutralize acid rain Affected Areas : Affected Areas Industrial acid rain is a substantial problem in China, Eastern Europe and Russia and areas down-wind from them. Acid rain from power plants in the Midwest United States has also harmed the forests of upstate New York and New England. This shows that the effects of acid rain can spread over a large area, far from the source of the pollution Effects of Acid Rain : Effects of Acid Rain Harmful to aquatic life Increased acidity in water bodies Stops eggs of certain organisms (e.g. fish) to stop hatching Changes population ratios Affects the ecosystem Effects of Acid Rain : Effects of Acid Rain Harmful to vegetation Increased acidity in soil Leeches nutrients from soil, slowing plant growth Leeches toxins from soil, poisoning plants Creates brown spots in leaves of trees, impeding photosynthesis Allows organisms to infect through broken leaves Effects of Acid Rain : Effects of Acid Rain MSN Encarta http://abacus.bates.edu/~ganderso/biology/bio270/clover_leaf_burns_pH2_30d.gif Effects of Acid Rain : Effects of Acid Rain Accelerates weathering in metal and stone structures Eg. Parthenon in Athens, Greece; Taj Mahal in Agra, India http://www.lauraknauth.com/photos/france/thinker.jpg MSN Encarta Effects of Acid Rain : Effects of Acid Rain Affects human health Respiratory problems, asthma, dry coughs, headaches and throat irritations Leeching of toxins from the soil by acid rain can be absorbed by plants and animals. When consumed, these toxins affect humans severely. Brain damage, kidney problems, and Alzheimer's disease has been linked to people eating "toxic" animals/plants. Preventive Measures : Preventive Measures Reduce amount of sulphur dioxide and oxides of nitrogen released into the atomosphere Use less energy (hence less fuel burnt) Use cleaner fuels Remove oxides of sulphur and oxides of nitrogen before releasing Flue gas desulphurization Catalytic Converters Preventive Measures : Preventive Measures Use cleaner fuels Coal that contains less sulphur "Washing" the coal to reduce sulphur content Natural Gas Preventive Measures : Preventive Measures Flue Gas Desulphurisation (FGD) Removes sulphur dioxide from flue gas (waste gases) Consists of a wet scrubber and a reaction tower equipped with a fan that extracts hot smoky stack gases from a power plant into the tower Lime or limestone (calcium carbonate) in slurry form is injected into the tower to mix with the stack gases and reacts with the sulphur dioxide present Preventive Measures : Preventive Measures (continued) Produces pH-neutral calcium sulphate that is physically removed from the scrubber Sulphates can be used for industrial purposes Scrubber at work MSN Encarta Preventive Measures : Preventive Measures Use other sources of electricity (i.e. nuclear power, hydro-electricity, wind energy, geothermal energy, and solar energy) Issue of cost http://upload.wikimedia.org/wikipedia/commons/4/4e/Nuclear_Power_Plant_Cattenom.jpg Reducing the effects of Acid Rain : Reducing the effects of Acid Rain Liming Powdered limestone/limewater added to water and soil to neutralize acid Used extensively in Norway and Sweden Expensive, short-term remedy Thank You : Thank You You do not have the permission to view this presentation. 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Acid Rain saravana3 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 838 Category: Science & Tech.. License: All Rights Reserved Like it (1) Dislike it (0) Added: September 30, 2010 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: alhumduallah (12 month(s) ago) excellent Saving..... Post Reply Close Saving..... Edit Comment Close By: kiranmarathe.km (18 month(s) ago) nice Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Slide 1: Members: [ Cheong Jiawei 4D04 ][Douglas Lee 4D06] [Kenny Wong 4D29][Law Chun Yin 4C12] [Yeow Kai Yao 4C34] By M.saravana Kumar Contents : Contents Definition Causes Formation Affected Areas Effects Preventive Measures Definition of Acid Rain : Definition of Acid Rain Precipitation that has a pH of less than that of natural rainwater (which is about 5.6 due to dissolved carbon dioxide). It is formed when sulphur dioxides and nitrogen oxides, as gases or fine particles in the atmosphere, combine with water vapour and precipitate as sulphuric acid or nitric acid in rain, snow, or fog. Causes of Acid Rain : Causes of Acid Rain Natural Sources Emissions from volcanoes and from biological processes that occur on the land, in wetlands, and in the oceans contribute acid-producing gases to the atmosphere Effects of acidic deposits have been detected in glacial ice thousands of years old in remote parts of the globe Causes of Acid Rain : Causes of Acid Rain The principal cause of acid rain is from human sources Industrial factories, power-generating plants and vehicles Sulphur dioxide and oxides of nitrogen are released during the fuel burning process (i.e. combustion) MSN Encarta Formation of Acid Rain : Formation of Acid Rain NOx+H2O+Vapour->H2NO3 SO2+H2O+vapour->H2SO3 Formation of Acid Rain : Formation of Acid Rain When water vapour condeses, or as the rain falls, they dissolve in the water to form sulphuric acid (H2SO4) and nitric acid (HNO3). While the air in cleaned of the pollutants in this way, it also causes precipitation to become acidic, forming acid rain Affected Areas : Affected Areas Canada Acid rain is a problem in Canada Water and soil systems lack natural alkalinity such as lime base Cannot neutralize acid Canada consists of susceptible hard rock such as granite Do not have the capacity to effectively neutralize acid rain Affected Areas : Affected Areas Industrial acid rain is a substantial problem in China, Eastern Europe and Russia and areas down-wind from them. Acid rain from power plants in the Midwest United States has also harmed the forests of upstate New York and New England. This shows that the effects of acid rain can spread over a large area, far from the source of the pollution Effects of Acid Rain : Effects of Acid Rain Harmful to aquatic life Increased acidity in water bodies Stops eggs of certain organisms (e.g. fish) to stop hatching Changes population ratios Affects the ecosystem Effects of Acid Rain : Effects of Acid Rain Harmful to vegetation Increased acidity in soil Leeches nutrients from soil, slowing plant growth Leeches toxins from soil, poisoning plants Creates brown spots in leaves of trees, impeding photosynthesis Allows organisms to infect through broken leaves Effects of Acid Rain : Effects of Acid Rain MSN Encarta http://abacus.bates.edu/~ganderso/biology/bio270/clover_leaf_burns_pH2_30d.gif Effects of Acid Rain : Effects of Acid Rain Accelerates weathering in metal and stone structures Eg. Parthenon in Athens, Greece; Taj Mahal in Agra, India http://www.lauraknauth.com/photos/france/thinker.jpg MSN Encarta Effects of Acid Rain : Effects of Acid Rain Affects human health Respiratory problems, asthma, dry coughs, headaches and throat irritations Leeching of toxins from the soil by acid rain can be absorbed by plants and animals. When consumed, these toxins affect humans severely. Brain damage, kidney problems, and Alzheimer's disease has been linked to people eating "toxic" animals/plants. Preventive Measures : Preventive Measures Reduce amount of sulphur dioxide and oxides of nitrogen released into the atomosphere Use less energy (hence less fuel burnt) Use cleaner fuels Remove oxides of sulphur and oxides of nitrogen before releasing Flue gas desulphurization Catalytic Converters Preventive Measures : Preventive Measures Use cleaner fuels Coal that contains less sulphur "Washing" the coal to reduce sulphur content Natural Gas Preventive Measures : Preventive Measures Flue Gas Desulphurisation (FGD) Removes sulphur dioxide from flue gas (waste gases) Consists of a wet scrubber and a reaction tower equipped with a fan that extracts hot smoky stack gases from a power plant into the tower Lime or limestone (calcium carbonate) in slurry form is injected into the tower to mix with the stack gases and reacts with the sulphur dioxide present Preventive Measures : Preventive Measures (continued) Produces pH-neutral calcium sulphate that is physically removed from the scrubber Sulphates can be used for industrial purposes Scrubber at work MSN Encarta Preventive Measures : Preventive Measures Use other sources of electricity (i.e. nuclear power, hydro-electricity, wind energy, geothermal energy, and solar energy) Issue of cost http://upload.wikimedia.org/wikipedia/commons/4/4e/Nuclear_Power_Plant_Cattenom.jpg Reducing the effects of Acid Rain : Reducing the effects of Acid Rain Liming Powdered limestone/limewater added to water and soil to neutralize acid Used extensively in Norway and Sweden Expensive, short-term remedy Thank You : Thank You