Micro 3050 Actual Exam
Questions With Reviewed 100%
Correct Detailed Answers
Guaranteed Pass!!
1. How is drinking water treated? What is special about chlorine? - ANSWER
- Remove large sediments from raw water
- Add coagulant to precipitate them out
- Filter using a large sand bath
- Treat with chlorine to kill bacteria (has residual so it stays clean even in pipes)
2. What are the goals of wastewater treatment? - ANSWER - Conserving
wildlife and fisheries
- Preventing pollution
- Keep condition of waterways clean
,- Preventing disasters (ex. polluted river catching fire)
3. Define "clarifiers" - ANSWER - Used in physical process of wastewater
treatment
- Allow things to settle and remove ⅓ of BOD
4. Define "BOD" - ANSWER - Biochemical Oxygen Demand
- Measures how much oxygen is consumed to degrade organic matter in the
wastewater
5. Define "floc" - ANSWER - Small clumps of bacteria that are
intentionally formed during wastewater treatment
6. Define "sludge" - ANSWER - Bacteria not settling properly and bulking
up, growing filaments
7. Describe primary wastewater treatment? - ANSWER - Pump water into
clarifiers and let large particles settle out
- Gets rid of ⅓ of BOD
- Separates solids from liquid, but the effluent (leftover liquid) still has a lot of BOD
, 8. Describe secondary wastewater treatment? What are potential issues that
could arise with this? - ANSWER - Grow bacteria in aeration basin
- Use power to oxygenate the basin, bacteria flow out into final clarifier where
they form flocs
- Send bacteria back into aeration basin to reuse them (starve them so they'll eat
any BOD available)
- If they form a bulking sludge then they won't settle in the final clarifier properly
- Could use a membrane to vacuum out basin, leaving bacteria behind but its
costly
9. Briefly describe how nitrogen plays a role in tertiary wastewater treatment
and how it can be helpful - ANSWER - Allow bacteria to nitrify the
water (Ammonia --> NO3)
- Then use anoxic basin so they convert nitrate to nitrogen gas which bubbles out
of tank
- Bacteria take part of BOD and oxidize it using NO3 instead of oxygen, lowers
amount of BOD going into aeration basin so you don't have to give as much
oxygen to them (but have to build an extra tank)
Questions With Reviewed 100%
Correct Detailed Answers
Guaranteed Pass!!
1. How is drinking water treated? What is special about chlorine? - ANSWER
- Remove large sediments from raw water
- Add coagulant to precipitate them out
- Filter using a large sand bath
- Treat with chlorine to kill bacteria (has residual so it stays clean even in pipes)
2. What are the goals of wastewater treatment? - ANSWER - Conserving
wildlife and fisheries
- Preventing pollution
- Keep condition of waterways clean
,- Preventing disasters (ex. polluted river catching fire)
3. Define "clarifiers" - ANSWER - Used in physical process of wastewater
treatment
- Allow things to settle and remove ⅓ of BOD
4. Define "BOD" - ANSWER - Biochemical Oxygen Demand
- Measures how much oxygen is consumed to degrade organic matter in the
wastewater
5. Define "floc" - ANSWER - Small clumps of bacteria that are
intentionally formed during wastewater treatment
6. Define "sludge" - ANSWER - Bacteria not settling properly and bulking
up, growing filaments
7. Describe primary wastewater treatment? - ANSWER - Pump water into
clarifiers and let large particles settle out
- Gets rid of ⅓ of BOD
- Separates solids from liquid, but the effluent (leftover liquid) still has a lot of BOD
, 8. Describe secondary wastewater treatment? What are potential issues that
could arise with this? - ANSWER - Grow bacteria in aeration basin
- Use power to oxygenate the basin, bacteria flow out into final clarifier where
they form flocs
- Send bacteria back into aeration basin to reuse them (starve them so they'll eat
any BOD available)
- If they form a bulking sludge then they won't settle in the final clarifier properly
- Could use a membrane to vacuum out basin, leaving bacteria behind but its
costly
9. Briefly describe how nitrogen plays a role in tertiary wastewater treatment
and how it can be helpful - ANSWER - Allow bacteria to nitrify the
water (Ammonia --> NO3)
- Then use anoxic basin so they convert nitrate to nitrogen gas which bubbles out
of tank
- Bacteria take part of BOD and oxidize it using NO3 instead of oxygen, lowers
amount of BOD going into aeration basin so you don't have to give as much
oxygen to them (but have to build an extra tank)
