EHST 2110 Exam 2 ECU Questions and
Answers 100% Correct
Is technology the answer to environmental health? - ANSWER - No. Education, surveillance,
inspection, and consultation are necessary.
Takes up oxygen in the water. Caused by Eutrophication, that puts nitrates and phosphates from
agriculture runoff (manure/fertilizer). - ANSWER - Algae Bloom
Impure drinking water through microbial waterborne disease. Epidemics took heavy tolls of
human population, worldwide prior to 19th century. Source discovered by Dr. Jon Snow, took off
water handle. - ANSWER - Cholera
Resistant to chlorine and need filtration in addition to disinfection. (mainly crypto) - ANSWER -
Giardia & Cryptosporidium
Establish max contaminate level, for more than 80 biological chemicals, tests drinking water.
Public water supply. - ANSWER - Safe Drinking Water Act
Garbage seepage going into the ground. - ANSWER - Leachate
Improve the quality of wastewater discharged into waterway without harming aquatic or
threatening the public health. - ANSWER - Aim of Sewage Treatment
Point source & Non-point source - ANSWER - General categories of Water Pollution
Sewage treatment plants and industrial discharges - ANSWER - Point Source Pollution
- Point Source Pollution: You can see where the contaminants are coming from
- Non-point Source Pollution: Unable to source where the contaminants origin are. - ANSWER -
2 Categories of Water Pollution
, When chlorine added to naturally occurring organic matter in lakes or rivers. Demonstrates
carcinogenic activity in living beings. - ANSWER - Trihalomethanes
Lead is a toxic metal found in products and around homes. Low levels of lead may even lead to
health issues. It's associated with old plumbing systems. Young children are at most risk. -
ANSWER - Lead in Drinking Water
Feed lot runoff, seepage from septic tanks from animal feces/fertilizer. Blue baby disease, has
nitrates in formula water, removing oxygen from the baby's body. - ANSWER - Nitrates in Water
St. James Parish, Fecal waste dumped into cesspool located near well of London. Dr. John
Snow found cholera in the sewage, water pump. He drew a map and found that a majority of
people dying were drinking from the broad street well. He removed the well's handle and people
stopped dying. He pioneered "epidemiology" the study and control of diseases. - ANSWER -
Broad Street Well (Cholera)
How they make fertilizer using gravity tanks. Nitrates and phosphates sludge fertilizer in the
bottom of the sedimentation tank. - ANSWER - Biosolid Landfarming/Management (sludge)
Primary treatment, secondary treatment & tertiary treatment - ANSWER - Three levels of
sewage treatment
Mechanical process, screens and sedimentation tank - ANSWER - Primary Treatment
Biological process. Adds air to grow microbes/bacteria to consume most of the remaining waste
materials. Required by law to at LEAST have secondary treatment. - ANSWER - Secondary
Treatment
Advanced treatment; chemical, physical and biological. Treated wastewater for drinking,
irrigation or recreation. Remove nitrates and phosphates. - ANSWER - Tertiary Treatment
Agriculture: farmland runoff, manure from livestock facilities, chemical fertilizers, (nitrates &
phosphates from fertilizer), and pesticides. Constructions activities: runoff from construction
sites contributes 10-20 times more sediment than agriculture; also carries construction waste
materials into waterways. Urban street runoff/storm water runoff, acid mine drainage, fallout of
airborne pollutants. Acid Deposition. - ANSWER - Non-Point Source Pollution (5 points)
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