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First action for a polymer spill - Answers -Apply an absorbent to the spill such as sand or kitty litter and then sweep up the materials. Total discharge head includes - Answers -Discharge pressure head + static discharge head + Velocity head (outlet) + €10,56
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First action for a polymer spill - Answers -Apply an absorbent to the spill such as sand or kitty litter and then sweep up the materials. Total discharge head includes - Answers -Discharge pressure head + static discharge head + Velocity head (outlet) +
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WASTEWATER III
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WASTEWATER III
First action for a polymer spill - Answers -Apply an absorbent to the spill such as sand or kitty litter and then sweep up the materials.
Total discharge head includes - Answers -Discharge pressure head + static discharge head + Velocity head (outlet) + Friction Head (discharge line)
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WASTEWATER III STUDY EXAM
First action for a polymer spill - Answers -Apply an absorbent to the spill such as sand
or kitty litter and then sweep up the materials.
Total discharge head includes - Answers -Discharge pressure head + static discharge
head + Velocity head (outlet) + Friction Head (discharge line)
Where is the best location to collect a sample? - Answers -A location that represents the
entire waste stream or basin.
What are the preservation and hold times for BOD samples? - Answers -48 hours at <
or = to 6 degrees C.
Define BOD. - Answers -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? - Answers -To allow residual samples to control
moisture prior to weighing.
What will happen if the flow to the grit chamber is too low? - Answers -Too much
organic material will be deposited.
How does an operator control the suspended solids in an activated sludge basin? -
Answers -By wasting and returning activated sludge.
Chlorine combines with ammonia to form what - Answers -Chloramines
What can the operator control with the activated sludge process? - Answers -Wasting
and return rates.
What is the best way to control filamentous bacteria? - Answers -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?
- Answers -470,577 gallons per day (exact problem)
Define endogenous respiration. - Answers -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? - Answers -At least 2.0 Feet per second.
What does hydrogen sulfide do in a collection system? - Answers -It causes corrosion.
, What must be on the warning tag attached to a switch that has been locked out? -
Answers -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) - Answers -40 to 60%
How is the flow of the chlorine controlled from the chlorinator? - Answers -With a
rotometer.
Chlorine is corrosive when it mixes with? - Answers -Moisture
What is the acceptable leak rate of a mechanical seal? - Answers -Mechanical seals
should not leak.
What piece of equipment is required to enter a confined space? - Answers -Oxygen
meter.
What should be worn to enter a space with a large chlorine leak? - Answers -SCBA
Why is waste water disinfected? - Answers -To destroy or disable pathogenic
organisms.
The rakes in a primary clarifier jerk, skips or hangs, what should be done? - Answers -
Drain clarifier and determine the source of the problem.
What is the predominant organism responsible for stabilizing the waste in the trickling
filter? - Answers -Bacteria
Where should the air relief valve be located in a forced main in the collections system? -
Answers -At the highest elevation in the line.
What hazardous gases would an operator be potentially exposed to? - Answers -
Hydrogensulfide, methane.
What is the ratio of methane to carbon dioxide in a properly operating anaerobic
digester? - Answers -65-70% methane and 30-35% carbon dioxide.
You have an inflow of 100 gallons of storm water into your collections system. How
many people does this represent? - Answers -100-200 gallons per day per person.
The best test to perform to determine the stabilization of waste in aerobic digestion is? -
Answers -Volatile solids.
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