Lecture 30 - Water Purification in Nature The natural water...

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Lecture 30 Water Pollution Introduction Water pollution can be classified by o o Its source (Wednesday) o Its fate (next Friday) Some important definitions: o Potable water is water that is safe to drink o Polluted water is water unusable for its intended purpose o Contaminated water is water unusable for any purpose Scope of the Problem About 17% of the world’s population (1.1 billion) do not have access to clean drinking water About 43% of the world’s population (2.6 billion) do not have access to adequate sewage disposal Leads to cholera, typhoid, hepatitis, etc. 1.8 million people (children) die each year from diarrhea caused by polluted water Water Pollution in the U.S About ¼ of all groundwater is polluted TN Water Pollution 5,800 miles of impaired streams in Tennessee o o Ten Mile Creek, West Knoxville filled with urban trash
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Unformatted text preview: Water Purification in Nature The natural water cycle purifies water in many ways Chemical Process o Inorganic such as precipitation o Biochemical reactions involving microbes Physical Processes o Dilution (diffusion & dispersion) o Sedimentation o Filtration o Aeration o Figure 15-2 Failure of Natural Purification Processes Increases in human populations & activities often overwhelm natural purification processes Some contaminants arent easily removed by natural filtration or sedimentation o Small particles (like viruses) o Dissolved contaminants Some contaminants are not easily broken down by chemical or biological processes o Synthetic chemicals, including pesticides, PCBs. Industrial solvents o Arsenic, heavy metals, & radionuclides Dilution becomes less effective as the number of pollutant sources increases o Figure 15.07...
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Lecture 30 - Water Purification in Nature The natural water...

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