Applied Environmental Microbiology

Question 1

What is the most important potential common source of infectious disease

Answer 1

Water

Question 2

What are 3 main examples of water born diseases?

Answer 2

Cholera, Shigellosis, Typhoid Fever

Question 3

This process relies on industrial scale use of microbes for bioconversion

Answer 3

Wastewater Treatment

Question 4

What is the goal of waste water treatment?

Answer 4

• To reduce organic and inorganic materials in waste water to a level that no longer supports microbial growth and to eliminate other potentially toxic materials
• Has lead to major reduction in spread of pathogens

Question 5

Type of waste water treatment that…

• Is physical
• Removes solid material and forms sludge
• Uses physical separation methods to separate solid and particulate organic and inorganic materials from waster water

Answer 5

Primary Treatment

-Involves Screening and Sedimentation

Question 6

Type of wastewater treatment that…

• Is biological
• Dissolved organic matter is transformed into microbial biomass and carbon dioxide by aerobic respiration and fermentative reactions carried out by various microbes

Answer 6

Secondary Treatment

Question 7

What are the steps in Secondary Treatment

Answer 7

1. Forms stable floc- settles well
2. Bulking sludge- does not settle properly
3. Activated sludge system- horizontal flow materials

Question 8

Waste effluent passed over rocks/solid material with microbial biofilms
-The community of biofilms degrades the wastes

Answer 8

Tricking Filter

Question 9

Reduces the amount of sludge produced by using microbial biomass for energy requirements

Answer 9

Extended Aeration

Question 10

What is the goal of anaerobic digestion?

Answer 10

It reduces the amount of sludge for disposal

-Produces methane

Question 11

Treatment in which, any physiochemical or biological process employing bioreactors, precipitation, filtration, or chlorination procedures similar to those used for purification of drinking water

Answer 11

Tertiary Treatment

Question 12

Steps of water purification… (5)

Answer 12

1. Sedimentation basin
2. Coagulation
3. Filtration
4. Treated with chemicals
5. Drinkable water

Question 13

Characteristics of Giardia Lamblia

Answer 13

• Backpackers disease
• Explosive Diarrhea
• Removed by slow sand filters

Question 14

Characteristics of Cryptoporidium

Answer 14

• Small protozoan with oocysts that escape usual purification schemes
• not killed by chlorination