WASTEWATER CLASS 1 TEST ( QUESTIONS WITH
100% ACCURATE SOLUTIONS) LATEST EDITION
2025, GRADED A+, GUARANTEED SUCCESS
what is lag growth phase - ANSWER cells growing in size
What type of hazard is SO2 on the Global data sheet? - ANSWER Acute toxicity
when a plant goes from conventinal to extended air, what will an operator notice? - ANSWER
decrease in MLVSS
What would cause unseeded BOD dilution water to deplete by .02 in less than 5 days? -
ANSWER Contaminated glassware
How do you remove struvite in an anaerobic digester? - ANSWER Adding an Iron Salt (Ferrous or
ferric chloride)
What chemical is added to a wet scrubber to control H2S odors at the headworks of a plant? -
ANSWER Sodium Hydroxide
A 15 HP pump is drawing 15 Kw, what is the pumps efficiency? - ANSWER 74.6%
How do you get rid of mud balls on a slow sand filter? - ANSWER Increase backwash (possibly
hydrogen peroxide rinse)
A control system which uses the concept of an open loop system as its forward path but has one
or more feedback loops between its output and input? - ANSWER Feed Backward
, Involves the use of two controllers with the output of the first controller providing the set point
for the second controller? - ANSWER Cascade Loop
What kind of controller can have complete control of a SBR - ANSWER programable logic
What can sense and control its own operation on a closed continuous basis? - ANSWER
Modulating controls
A controller that can receive temperature, flow rate, pressure, and other types of measurement
readings from sensors and send corresponding instructions to control elements such as valves? -
ANSWER Single loop
A system that can perform functions such as administering the type and amount of chemicals
that are needed in the different stages in the treatment process? - ANSWER Programmable logic
What is the first step to increasing sewer rates? - ANSWER Come up with revenue cost
At what temperature should a Mesophilic digester operate at? - ANSWER 85-100 degrees
Fahrenheit
At what temperature should a thermophilic digester operate at? - ANSWER 122-140 degrees
Fahrenheit
At what temperature should a Cryphilic Digester operate at? - ANSWER Less than 68 degrees
Fahrenheit
An operator runs an OUR test on different samples taken every 3 m (10ft) down the length of an
aerated activated Sludge basin. What is the operator trying to figure out? - ANSWER The point
at which additional oxygen is required
100% ACCURATE SOLUTIONS) LATEST EDITION
2025, GRADED A+, GUARANTEED SUCCESS
what is lag growth phase - ANSWER cells growing in size
What type of hazard is SO2 on the Global data sheet? - ANSWER Acute toxicity
when a plant goes from conventinal to extended air, what will an operator notice? - ANSWER
decrease in MLVSS
What would cause unseeded BOD dilution water to deplete by .02 in less than 5 days? -
ANSWER Contaminated glassware
How do you remove struvite in an anaerobic digester? - ANSWER Adding an Iron Salt (Ferrous or
ferric chloride)
What chemical is added to a wet scrubber to control H2S odors at the headworks of a plant? -
ANSWER Sodium Hydroxide
A 15 HP pump is drawing 15 Kw, what is the pumps efficiency? - ANSWER 74.6%
How do you get rid of mud balls on a slow sand filter? - ANSWER Increase backwash (possibly
hydrogen peroxide rinse)
A control system which uses the concept of an open loop system as its forward path but has one
or more feedback loops between its output and input? - ANSWER Feed Backward
, Involves the use of two controllers with the output of the first controller providing the set point
for the second controller? - ANSWER Cascade Loop
What kind of controller can have complete control of a SBR - ANSWER programable logic
What can sense and control its own operation on a closed continuous basis? - ANSWER
Modulating controls
A controller that can receive temperature, flow rate, pressure, and other types of measurement
readings from sensors and send corresponding instructions to control elements such as valves? -
ANSWER Single loop
A system that can perform functions such as administering the type and amount of chemicals
that are needed in the different stages in the treatment process? - ANSWER Programmable logic
What is the first step to increasing sewer rates? - ANSWER Come up with revenue cost
At what temperature should a Mesophilic digester operate at? - ANSWER 85-100 degrees
Fahrenheit
At what temperature should a thermophilic digester operate at? - ANSWER 122-140 degrees
Fahrenheit
At what temperature should a Cryphilic Digester operate at? - ANSWER Less than 68 degrees
Fahrenheit
An operator runs an OUR test on different samples taken every 3 m (10ft) down the length of an
aerated activated Sludge basin. What is the operator trying to figure out? - ANSWER The point
at which additional oxygen is required
