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FE Exam – Environmental questions and answers
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FE Exam – Environmental questions and answers
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FE Exam – Environmental questions andanswers
WASTEWATER TREATMENT BIOLOGY -
Aerobic Decomposition - decomposition of organic material in the presence of
oxygen
Aerobic Decomposition
a. end products
b. appropriate BOD levels
c. how much sludge produced - a. water, CO2, new cell material
b. <500 mg/l (dilute ww)
c. produces a lot of sludge
Anaerobic Decomposition - decomposition in the absence of oxygen and nitrate
- primary electron acceptors are sulfate (SO42-), CO2, and organic compounds
that can be reduced
Anaerobic Decomposition
a. end products
b. appropriate BOD levels
,FE Exam – Environmental questions and
answers
c. how much sludge produced - a. CO2, methane, water, ammonia, hydrogen
sulfide
b. > 1000 mg/l
c. very little sludge, anaerobic can be used to stabilize sludge produced in aerobic
and anoxic treatment
d. is a smelly process and requires temperatures to be elevated initially
Anoxic decomposition - NO3- if final e- acceptor
Sequence of oxidation by bacteria in the presence of no oxygen
compounds to be oxidized
nitrate (NO3-
sulfate (SO4-2)
dissolved oxygen - the essence of oxygen usage reduced by bacteria is dissolved
oxygen, nitrate, then sulfate
What is a bacteriophage? - a virus that infects bacteria
, FE Exam – Environmental questions and
answers
The addition of protozoa in WW will.... - protozoa consume algae and bacteria in
ww
the 2 groups of coliform - 1. human/animal
2. soil
Reactor Types and definition and example - 1. batch: fill, treat, empty; washing
machine, treat industry ww
2. completely mixed flow: continuous flow, stirred; activated sludge unit
3. plug flow: no mixing; natural systems, pipes
TOXICOLOGY -
three primary exposure pathways for human - 1. dermal adsorption
2. inhalation
3. ingestion
pulmonary toxicity - toxicity of the respiratory system
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