HE100 Study Guide - Final Guide: Thermal Pollution, Acute Radiation Syndrome, Dosimeter

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Published on 16 Oct 2011
School
WLU
Department
Health Sciences
Course
HE100
ENVIRONMENTAL HEALTH
Environmental Pollution
Water Pollution
Pathogens
o Refers to living, biological organisms like bacteria, viruses and protozoa
o Enter the water system though human and animal wastes
o Example: E. coli, cryptosporidium
Biological imbalances
o Eutrophication
Overabundance of nitrates and phosphates in the water
Can contribute to the overgrowth of plants
o Putrefaction
The result of depleted oxygen in the bodies of water where plants have overgrown
The environment is not stable enough to support animal life
Result = fish tend to die and float to the top where they begin to decay
Toxic substances
o Refers specifically to non biological, non living substances
o Includes toxins, metals, chemicals like DDT (weed killers), PCBs
o Consumed by the fish in the water system, and then ingested by humans
o Example: mercury, lead, arsenic, oil
Other: oil spills, thermal pollution (industries who use water too cool water, which is then
returned to the ocean/lake), sediments
Land Pollution
Solid waste
o Open dumping (regular landfill)
o Sanitary landfill (biological waste, eg. medical waste)
o Ocean dumping
Safety issues for animals (they eat the waste)
Fish start to eat the dumped waste and when it stops coming the food chain is
disrupted
Waste can wash up on shore
Chemical waste
o Pesticides
o Herbicides
Radiation
Radiation
o Non ionizing radiation
Moves in longer wave lengths
Less dangerous
Examples: radio waves, TV signals, microwaves, infrared waves, visible light
o Ionizing radiation
More dangerous because of release of particles and electromagnetic rays during
breakdown of atomic nuclei
Examples: uranium, sunlight
o Radiation is measured in "rads"
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Document Summary

Pathogens: refers to living, biological organisms like bacteria, viruses and protozoa, enter the water system though human and animal wastes, example: e. coli, cryptosporidium. Overabundance of nitrates and phosphates in the water. Can contribute to the overgrowth of plants: putrefaction. The result of depleted oxygen in the bodies of water where plants have overgrown. The environment is not stable enough to support animal life. Result = fish tend to die and float to the top where they begin to decay. Includes toxins, metals, chemicals like ddt (weed killers), pcbs: refers specifically to non biological, non living substances, consumed by the fish in the water system, and then ingested by humans, example: mercury, lead, arsenic, oil. Other: oil spills, thermal pollution (industries who use water too cool water, which is then returned to the ocean/lake), sediments. Solid waste: open dumping (regular landfill, sanitary landfill (biological waste, eg. medical waste, ocean dumping. Safety issues for animals (they eat the waste)