Units_and_Definitions

Units_and_Definitions - CEE 320 Environmental Engineering...

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CEE 320 Definitions and units Environmental Engineering 1 Some useful definitions 1) Environment: Natural and constructed settings Natural: lakes, rivers, ambient air Constructed : water distribution system, wastewater treatment plant, indoor air 2) Constituents: All materials in environmental fluid (including the fluid) 3) Impurities or species : Everything except the dominant background fluid (i.e. water or air) 4) Contaminants and pollutants : species with some undesireable consequences associated with its presence – both anthropogenic or natural 5) Anthropogenic : due to human activity 6) Pristine environment: setting where the environmental fluid is not significantly impacted by human activity. Not necessarily free of contaminants! Forest fires – smoke Lightning – produces ozone Volcanic activity – soot and acid gases Units See also inside cover of your textbook Mass concentration : mass per unit volume of fluid Examples: Water: milligrams per liter (mg/L) Air: micrograms per cubic meter ( μ g/m 3 ) Mole concentration: moles per unit volume of fluid Recall the following – Mole is equal to Avogadro’s number of elements = 6.02 x 10 23
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This note was uploaded on 05/04/2010 for the course CEE 320 taught by Professor Mcmahon during the Spring '10 term at Wisconsin.

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Units_and_Definitions - CEE 320 Environmental Engineering...

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