ࡱ> 796 bjbjVV ><< 04666666$ZZo,,,.4,4,,,Izv, 0,+X+,+,,ZZ@+ : Miller Chapter 20 Water Pollution Core case study-Lake Washington Initial treats and problems Solutions and successes 20-1 Water pollution Point source Nonpoint source Three main sources/causes of water pollution Use/spread of human made products pollution Pollution effects amplified by climate change Infectious agents as water pollution-numbers of disease causing agents and global death toll Review tables 20-1, 20-2 and water testing 20-2 Streams naturally clean themselves unless what demands are put on them Relationship between breakdown of biodegradable wastes by bacteria and DO-oxygen sag curve How has stream pollution changed in developed countries? What is the current outlook and issues for stream pollution in developing countries? Riparian restoration-the man who planted trees to restore a stream CASE STUDY Indias Ganges River Importance of the river Environmental issues of the Ganges Pollution and dilution what are the issues to recovery? Eutrophication Cultural eutrophication (specific causes?) EPA and its evaluation of cultural eutrophication Revisit Lake Washington-successes and new issues CASE STUDY pollution in the Great Lakes Vulnerabilities of the Lakes Progress? 2007 State of the Great Lakes report? 20-3 Why is groundwater more vulnerable to pollution that surface waters? Threats to ground water? CASE STUDY Natural threat from arsenic in groundwater Where, why and who? Prevention, how is that the only effective method to protect groundwater? (figure 20-13) Methods of purifying drinking water Developed vs developing countries differences CASE STUDY protecting watersheds How and why is New York City known for its water quality purity What laws protect water quality? Bottled water-friend or foe? And how well is it regulated? 20-4 Coastal areas and ocean pollution Coastal human populations and pollution 2006 State of the Marine Environment Study findings Cruise ships and pollutions? HABs harmful algal blooms causes and consequences Dead zones????? Ocean oil spills-ecologic and economic consequences Figure 20-48-prevention and clean up 20-5 Reduction of nonpoint pollution of surface waters Laws reducing point source pollution CASE STUDY US experience reducing point source pollution Successes of the Clean Water Act of 1972 Challenges/needs to update the Act Sewage treatment reduces water pollution by? What is a septic tank? What is primary sewage treatment? What is secondary sewage treatment? What is advanced or tertiary sewage treatment? Health benefits of treating waste? Composting toilets? Science Focus-treating sewage with nature? 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