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Lecture

Study Guide for Lecture 3: with information from lecture slides + information added by prof during lecture

4 Pages
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Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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EESA10 – Human Health and the Environment
LECTURE 3
Slide: Liquid water capitol
-The earth is a water planet; water covers about 71% of the surface, most of which is salt
water
oSalt water limits its usage and makes it more expensive
-No species can do without water
o60% of the human body is water
-Water sculpts the earths surface; changes the shape of the earth (soil erosion, soil
movement, rain, etc)
-Water helps to moderate climate; more water = milder climate
-Global issues: quality and quantity of water
o2.6% of available water is fresh water, 97.4% is salt water
oOnly 0.014% of fresh water is readily accessible, Ground water is also a possible
supply of water, but it cannot be considered easily accessible
Slide: Drinking Water
-Water contains minerals, Ca, Na, K, etc. needed by humans
oPure water is not good, stripped of minerals which are needed (distilled water is
bad to drink)
How is drinking water treated?
-Water from rivers, lakes, and reservoirs: (mechanical purities (plant parts, particles, etc.)
need to be removed) put into settling tanks, coagulants are added, water is filtered,
chemical treatment (chlorination)
oVictorian Time: water was polluted with microbes, resulting in many deaths from
different types of diarrhea, but then the discovery of chlorination improved it
-Groundwater: naturally filtered, contains less organic matter, often does not need any
treatment
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Description
EESA10 Human Health and the Environment LECTURE 3 Slide: Liquid water capitol - The earth is a water planet; water covers about 71% of the surface, most of which is salt water o Salt water limits its usage and makes it more expensive - No species can do without water o 60% of the human body is water - Water sculpts the earths surface; changes the shape of the earth (soil erosion, soil movement, rain, etc) - Water helps to moderate climate; more water = milder climate - Global issues: quality and quantity of water o 2.6% of available water is fresh water, 97.4% is salt water o Only 0.014% of fresh water is readily accessible, Ground water is also a possible supply of water, but it cannot be considered easily accessible Slide: Drinking Water - Water contains minerals, Ca, Na, K, etc. needed by humans o Pure water is not good, stripped of minerals which are needed (distilled water is bad to drink) How is drinking water treated? - Water from rivers, lakes, and reservoirs: (mechanical purities (plant parts, particles, etc.) need to be removed) put into settling tanks, coagulants are added, water is filtered, chemical treatment (chlorination) o Victorian Time: water was polluted with microbes, resulting in many deaths from different types of diarrhea, but then the discovery of chlorination improved it - Groundwater: naturally filtered, contains less organic matter, often does not need any treatment www.notesolution.com
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