EHST 2110 Exam 2 ECU QUESTIONS AND ANSWERS
UPDATED RATED A+ NEW EDITION
No. Educa on, surveillance, inspec on, and consulta on are necessary. - Ans Is technology the
answer to environmental health?
Algae Bloom - Ans Takes up oxygen in the water. Caused by Eutrophica on, that puts nitrates
and phosphates from agriculture runoff (manure/fer lizer).
Cholera - Ans Impure drinking water through microbial waterborne disease. Epidemics took
heavy tolls of human popula on, worldwide prior to 19th century. Source discovered by Dr. Jon
Snow, took off water handle.
Giardia & Cryptosporidium - Ans Resistant to chlorine and need filtra on in addi on to
disinfec on. (mainly crypto)
Safe Drinking Water Act - Ans Establish max contaminate level, for more than 80 biological
chemicals, tests drinking water. Public water supply.
Leachate - Ans Garbage seepage going into the ground.
2 Categories of Water Pollu on - Ans - Point Source Pollu on: You can see where the
contaminants are coming from
- Non-point Source Pollu on: Unable to source where the contaminants origin are.
Trihalomethanes - Ans When chlorine added to naturally occurring organic ma<er in lakes or
rivers. Demonstrates carcinogenic ac vity in living beings.
, Lead in Drinking Water - Ans 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.
Nitrates in Water - Ans Feed lot runoff, seepage from sep c tanks from animal feces/fer lizer.
Blue baby disease, has nitrates in formula water, removing oxygen from the baby's body.
Broad Street Well (Cholera) - Ans 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.
Biosolid Landfarming/Management (sludge) - Ans How they make fer lizer using gravity tanks.
Nitrates and phosphates sludge fer lizer in the bo<om of the sedimenta on tank.
Three levels of sewage treatment - Ans Primary treatment, secondary treatment & ter ary
treatment
Primary Treatment - Ans Mechanical process, screens and sedimenta on tank
Secondary Treatment - Ans 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.
Ter ary Treatment - Ans Advanced treatment; chemical, physical and biological. Treated
wastewater for drinking, irriga on or recrea on. Remove nitrates and phosphates.
Aim of Sewage Treatment - Ans Improve the quality of wastewater discharged into waterway
without harming aqua c or threatening the public health.
UPDATED RATED A+ NEW EDITION
No. Educa on, surveillance, inspec on, and consulta on are necessary. - Ans Is technology the
answer to environmental health?
Algae Bloom - Ans Takes up oxygen in the water. Caused by Eutrophica on, that puts nitrates
and phosphates from agriculture runoff (manure/fer lizer).
Cholera - Ans Impure drinking water through microbial waterborne disease. Epidemics took
heavy tolls of human popula on, worldwide prior to 19th century. Source discovered by Dr. Jon
Snow, took off water handle.
Giardia & Cryptosporidium - Ans Resistant to chlorine and need filtra on in addi on to
disinfec on. (mainly crypto)
Safe Drinking Water Act - Ans Establish max contaminate level, for more than 80 biological
chemicals, tests drinking water. Public water supply.
Leachate - Ans Garbage seepage going into the ground.
2 Categories of Water Pollu on - Ans - Point Source Pollu on: You can see where the
contaminants are coming from
- Non-point Source Pollu on: Unable to source where the contaminants origin are.
Trihalomethanes - Ans When chlorine added to naturally occurring organic ma<er in lakes or
rivers. Demonstrates carcinogenic ac vity in living beings.
, Lead in Drinking Water - Ans 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.
Nitrates in Water - Ans Feed lot runoff, seepage from sep c tanks from animal feces/fer lizer.
Blue baby disease, has nitrates in formula water, removing oxygen from the baby's body.
Broad Street Well (Cholera) - Ans 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.
Biosolid Landfarming/Management (sludge) - Ans How they make fer lizer using gravity tanks.
Nitrates and phosphates sludge fer lizer in the bo<om of the sedimenta on tank.
Three levels of sewage treatment - Ans Primary treatment, secondary treatment & ter ary
treatment
Primary Treatment - Ans Mechanical process, screens and sedimenta on tank
Secondary Treatment - Ans 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.
Ter ary Treatment - Ans Advanced treatment; chemical, physical and biological. Treated
wastewater for drinking, irriga on or recrea on. Remove nitrates and phosphates.
Aim of Sewage Treatment - Ans Improve the quality of wastewater discharged into waterway
without harming aqua c or threatening the public health.
