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Wastewater Treatment: Final Questions and Answers, Exams of Water and Wastewater Engineering

Southern University System (SUS)Water and Wastewater Engineering

A comprehensive set of questions and answers covering various aspects of wastewater treatment. It delves into key concepts such as ras flow, activated sludge, disinfection methods, and the role of microorganisms in the process. Valuable for students and professionals seeking to understand the principles and practices of wastewater treatment.

Typology: Exams

2023/2024

Available from 10/30/2024

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Waste Water Treatment Final Questions And Answers
1. What are the two primary purposes of RAS Flow - ANS-maintain sufficient bio-populations, a
safe sludge blanket and to prevent carry over
2. Mixed Liquor Volatile suspended solids are also ___________ - ANS-biomass
3. Oxidation ditches are __________ flow reactors that can also be called ____________ track
basins - ANS-plug, aeration
4. Activated sludge is a completely __________ system - ANS-mixed
5. ________________ walls reduce short circuiting, getting us closer to theoretical HLR time - ANS-
baffle
6. _______________ stabilization is more for ____________ processes and stabilizes return
activated sludge - ANS-Contact, industrial
7. _________________ bacteria causes carry over and is bad compared to floc - ANS-filamentous
8. In Aerobic Digestion ____________ is the electron acceptor - ANS-O2
9. ____________ respiration is when bugs consume themselves - ANS-endogenous
10. Anoxic digestion uses _____________ as its terminal electron acceptor - ANS-Nitrate
11. Anaerobic Digestion terminal acceptors are - ANS-CO2 and SO4(2-)
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Waste Water Treatment Final Questions And Answers

  1. What are the two primary purposes of RAS Flow - ANS-maintain sufficient bio-populations, a safe sludge blanket and to prevent carry over
  2. Mixed Liquor Volatile suspended solids are also ___________ - ANS-biomass
  3. Oxidation ditches are __________ flow reactors that can also be called ____________ track basins - ANS-plug, aeration
  4. Activated sludge is a completely __________ system - ANS-mixed
  5. ________________ walls reduce short circuiting, getting us closer to theoretical HLR time - ANS- baffle
  6. _______________ stabilization is more for ____________ processes and stabilizes return activated sludge - ANS-Contact, industrial
  7. _________________ bacteria causes carry over and is bad compared to floc - ANS-filamentous
  8. In Aerobic Digestion ____________ is the electron acceptor - ANS-O
  9. ____________ respiration is when bugs consume themselves - ANS-endogenous
  10. Anoxic digestion uses _____________ as its terminal electron acceptor - ANS-Nitrate
  11. Anaerobic Digestion terminal acceptors are - ANS-CO2 and SO4(2-)
  1. ___________ sludge is also filamentous bacteria - ANS-bulking
  2. _________ settling is also zone settling and is the removal of water from the sludge zone - ANS- hindered
  3. ___________________-___________ membrane examples are reverse osmosis and nanofiltration - ANS-non,porous
  4. ______________-__________ membranes include ultrafiltration and micorfiltration - ANS- microporous
  5. Reverse osmosis removes ________ - ANS-salts
  6. nanofiltration is __________ softening - ANS-water
  7. ultrafiltration removes __________ organics - ANS-dissolved
  8. microfiltration is _____________ separation - ANS-solids
  9. EPS stands for ____________ polymer substances - ANS-extracellular
  10. membrane ___________ is the accumulation of rejected species at the membrane surface - ANS-fouling
  11. During _____________ sludge processes, reaction rate orders occur - ANS-activated
  12. ___________ is the buffering capacity of the system - ANS-alkalinity
  1. What is the most effective type of free Chlorine - ANS-HOCl
  2. Combined Chlorine disinfection include _________________ - ANS-chlromines
  3. ________________ irradiation is disinfection causing the inactivation of pathways in viruses and organisms - ANS-UV
  4. Chloramines are formed through the interaction of ______________ and free chlorine (HOCl) - ANS-ammonia
  5. DBPs stands for - ANS-disinfection by-products
  6. What two types of disinfection can be used to limit the risk of DBP formation - ANS-O3 and UV
  7. One disinfection mechanism is destroy/impair cellular ______________ - ANS-structure
  8. Change in cell _____________ or altering physical structure is another type of disinfection process - ANS-permeabillity
  9. Interference with energy yielding ___________ is another type of disinfection process - ANS- metabolism
  10. Interference with biosynthesis via mutation of ______ or RNA strands is another type of disinfection process - ANS-DNA
  11. Ozone decomposes into ______________ radicals and oxidation - ANS-hydroxyl
  1. What is the most common method of ozonation - ANS-Corona discharge
  2. ___________ pressure UV Lambs have one UV range at 254 nm - ANS-Low
  3. Medium Pressure Heat Lambs have greater disinfection with higher __________ consumption - ANS-energy
  4. The energy range for medium pressure lamps - ANS-1k-10k Watts
  5. Low Pressure Lamps have an energy range of - ANS-40-500 Watts
  6. The ___________ the wavelength, the higher the energy and the more dangerous the UV process becomes - ANS-smaller
  7. The more light absorbed, the less _______________ for disinfection - ANS-Radiation
  8. ____________________ is the measure of the amount of light that passes through a water sample - ANS-transmittance
  9. Chlorination is the only disinfectant to provide a __________ - ANS-residual
  10. ____________ are the safer form of elemental chlorine but are more expensive - ANS- hypochlorite's
  11. Chloramines are as effective as free chlorine for inactivating bacteria, but less effective against ____________ - ANS-viruses