ESM202Lecture02_2008

ESM202Lecture02_2008 - 1 ESM 202 Understanding Water...

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Unformatted text preview: 1 ESM 202 Understanding Water Quality Parameters 2 Liquid water 71% of Earths surface 97% of that is saltwater 50 to 90% of living organisms Huge demand; supply concerns Irrigation can use 90% Yet most (>90%) sewage untreated 3 Regulated Contaminants Inorganics: aluminum, fluoride Organics: dichloromethane Radioisotopes: uranium Lead, copper Microbial contaminants (viruses, bacteria) Color Chloride Odor TDS turbidity http://www.goletawater.com/waterquality/pdf/Goleta_CCR_v2_6_6_07.pdf 4 Treatment for Potable Water 5 Management Why Water Quality Matters Human Health Sustainable management Restoration Remediation 6 source: http://protectingwater.com/index.html 7 Water Quality Parameters Dissolved Oxygen Temperature Biochemical Oxygen Demand Nutrients: N & P Minerals: Anions & Cations Trace Elements Toxic Organic Compounds Coliform Bacteria, other Microbes, Viruses Solids (TDS, SS) Alkalinity, pH Hardness Turbidity Color Taste and Odor 8 Dissolved Oxygen (DO) O 2 (gas) O 2 (aq) Increasing Temp Increasing Salinity High DO Low DO 10 Basic Concepts in Water Chemistry 11 Basic Concepts Equilibrium A + B C + D K = [C] [D] [A] [B] = Products Reactants Thermodynamic equilibrium Reversible vs. irreversible 12 Basic Concepts Concentration in aqueous or solid systems [HCO 3- ] = mol / L = M Convert from mol/L to g/L using the Molecular Weight (MW), g/mol Concentration in gas phase: P CO2 = atm 13 Dissolution O 2 dissolution in water O 2 (aq) O 2 (g) = 663 atm . L/mol 0.209 atm 3.15 x 10-4 mol/L 10.07 x 10-3 g/L 32.00 g/mol = 0.000315 mol/L 10.07 mg/L 32.00 g/mol = K H,O2 = [O 2 (aq)] P O2 = 14 Dissolution CO 2 dissolution in water: CO 2 (aq) = CO 2 (g) K H = [CO 2 (aq)] = 26.9 atm L/ mol P CO2 15 Oxygen Demand 16 Oxygen Demand...
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This note was uploaded on 08/06/2008 for the course ESM 202 taught by Professor Keller during the Winter '08 term at UCSB.

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ESM202Lecture02_2008 - 1 ESM 202 Understanding Water...

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