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Wastewater III Study Exam|73 Questions with Verified Answers
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Wastewater III Study Exam|73 Questionswith Verified Answers
First action for a polymer spill - -Apply an absorbent to the spill such as sand
or kitty litter and then sweep up the materials.
-Total discharge head includes - -Discharge pressure head + static
discharge head + Velocity head (outlet) + Friction Head (discharge line)
-Where is the best location to collect a sample? - -A location that represents
the entire waste stream or basin.
-What are the preservation and hold times for BOD samples? - -48 hours at
< or = to 6 degrees C.
-Define BOD. - -The rate at which organisms use the oxygen in water or
waste water while stabilizing decomposeable organic matter under aerobic
conditions.
-What is the purpose of a dessicator? - -To allow residual samples to control
moisture prior to weighing.
-What will happen if the flow to the grit chamber is too low? - -Too much
organic material will be deposited.
-How does an operator control the suspended solids in an activated sludge
basin? - -By wasting and returning activated sludge.
-Chlorine combines with ammonia to form what - -Chloramines
-What can the operator control with the activated sludge process? - -
Wasting and return rates.
-What is the best way to control filamentous bacteria? - -Addition of chlorine
to the (RAS.) Called return on some tests.
-A 5.2 acre lagoon with an in-fluent of 47000 gallons per day is dropped 3
inches a day from a depth of 5 feet to a depth of 2 feet. How many gallons
are discharged each day? - -470,577 gallons per day (exact problem)
-Define endogenous respiration. - -A situation where living organisms
oxidize some of their own cellular mass instead of new organic matter they
absorb or absorb from their environment.
, -What should the velocity of the sewage in a gravity sewer line be coming
into the waste water plant? - -At least 2.0 Feet per second.
-What does hydrogen sulfide do in a collection system? - -It causes
corrosion.
-What must be on the warning tag attached to a switch that has been locked
out? - -The signature of the person who locked out the switch and who is the
only person authorized to remove the tag.
-Primary clarification generally removes what percentage of TSS? (Total
Suspended Solids) - -40 to 60%
-How is the flow of the chlorine controlled from the chlorinator? - -With a
rotometer.
-Chlorine is corrosive when it mixes with? - -Moisture
-What is the acceptable leak rate of a mechanical seal? - -Mechanical seals
should not leak.
-What piece of equipment is required to enter a confined space? - -Oxygen
meter.
-What should be worn to enter a space with a large chlorine leak? - -SCBA
-Why is waste water disinfected? - -To destroy or disable pathogenic
organisms.
-The rakes in a primary clarifier jerk, skips or hangs, what should be done? -
-Drain clarifier and determine the source of the problem.
-What is the predominant organism responsible for stabilizing the waste in
the trickling filter? - -Bacteria
-Where should the air relief valve be located in a forced main in the
collections system? - -At the highest elevation in the line.
-What hazardous gases would an operator be potentially exposed to? - -
Hydrogensulfide, methane.
-What is the ratio of methane to carbon dioxide in a properly operating
anaerobic digester? - -65-70% methane and 30-35% carbon dioxide.
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