Lec20+Water+II - Water II Drinking Water Chapter 5 The...

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Water II – Drinking Water Chapter 5
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The Hydrologic Cycle Thurman and Burton Introductory Oceanography 9 th ed.
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www.epa.gov/safewater/
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Important Pollutants in Water Pollutant Sources Effects Heavy metals (Cd, Cr, Pb, Se, etc.) Rocks and minerals, fertilizer impurities, industrial products (paints, dyes, metals, semiconductors, etc.) Neurological damage, cancer, etc. Arsenic (As) Rat poison, pesticides, treated wood, animal feed, rocks and minerals Internal bleeding, hair loss, cancer, etc. Nitrate Human and animal waste; fertilizer Disrupts oxygen flow (blue baby syndrome); increases microbe growth Organic compounds (benzene, tetrachloroethylene, etc.) Pesticides and herbicides, drycleaning, industrial solvents (paint, etc.) Cancer, neurological damage, various health effects Methyl tert-butyl ether (MTBE) Gasoline additive Carcinogen Microbes (bacteria, viruses, protozoa, etc.) Human and animal waste; soil and surface water Nausea, diarrhea, etc. www.epa.gov/safewater/contaminants/
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Individual Residence Well Water Ground water Well EPA Recommendations for Minimum Distance from Well: Septic Tanks, 50 feet Livestock yards, Silos, Septic Leach Fields, 50 feet Petroleum Tanks, Liquid-Tight Manure Storage and Fertilizer Storage and Handling, 100 feet Manure Stacks, 250 feet Pollutants removed by adsorption/filtration as water passes through sand, clay, etc.
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Municipal Well Water www.epa.gov/safewater/
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www.unitedwater.com Municipal Well Water Treatment Kill microbes by oxidation: Cl 2 + H 2 O HOCl + HCl HOCl is the active ingredient in bleach; passes through microbe cell wall and oxidizes organic molecules
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This note was uploaded on 11/20/2011 for the course CHEM 100 taught by Professor Vanleer,m during the Spring '08 term at University of Delaware.

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Lec20+Water+II - Water II Drinking Water Chapter 5 The...

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