WASTEWATER TEST CERTIFICATION
SCRIPT 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◍ what happens when there is more food in the influent to the aeration tank?.
Answer: more oxygen is required in the aeration tank
◍ what could happen if the volatile acid/alkalinity ratio starts to increase, and
corrective action is not taken immediately?.
Answer: carbon dioxide content in the digester gas will increase
◍ what causes primary effluent to become black and odorous?.
Answer: improper sludge removal from the clarifier
◍ Proportional composite samples.
Answer: What is the best sampling method for BOd and suspended solids
testing
◍ What are collids?.
Answer: very small, finely divided solids that remain dispersed in a liquid
for a long time
◍ what is true during the colder winter months?.
Answer: Modify operations to increase solids under aeration to provide
more microorganisms to treat the BOD
◍ Wear rings.
Answer: Used in a centrifugal pump to prevent internal leakage and is
usually made of bronze or cast iron. Replaceable rings that are attached to
the impeller and/or the pump casing to allow a small running clearance
between the impeller and pump casing without causing wear of the actual
impeller or pump casing material. In a centrifugal pump are designed to
, prevent excessive internal water circulation between the suction and
discharge sides of a pump and to prevent wear of the impeller and inside
case.
◍ which of the following enters the headworks of a treatment plant?.
Answer: influent
◍ Gravity and evaporation.
Answer: How does the dewatering process occur after the digested sludge is
applied to a sand drying bed?
◍ Turbidity to increase in the final effluence.
Answer: inadequate air supply in an activated sludge system will cause
◍ what should you do if there is a thick, dark foam on the surface of an
aeration tank?.
Answer: increase sludge wasting
◍ what is used to control filamentous organisms?.
Answer: chlorine
◍ 80%-90%.
Answer: What BOD efficiencies can be expected from a convential trickling
filter plant?
◍ what must you do before entering a room with harmful concentration of
chlorine gas in the air?.
Answer: wear self-contained breathing apparatus (SCBA)
◍ A decrease of dissolved oxygen residual in the aeration tank.
Answer: If an operator were to receive a high organic waste load at an
activated sludge plant, what would be the first indicators?
◍ CaCO3 (Calcium Carbonate) Alkalinity.
Answer: What is the best test to perform that would indicate water quality
while monitoring nitrogen oxidation and the nitrification/denitrification
process?
◍ who must be included in a hearing conservation program to prevent hearing
, loss?.
Answer: employees whose normal noise exposure equals or exceeds an
8-hour time-weighted average of 85 decibels
◍ Excessive weed growthPoor arrangement of inlet and outletIrregular pond
bottom.
Answer: Which three are possible causes of "short circuiting" in a pond
Excessive weed growth High influent BODPoor arrangement of inlet and
outlet Irregular pond bottom
◍ what is accomplished by the activated sludge process?.
Answer: remove soluble or finely divided suspended materials
◍ Surcharge.
Answer: refers to the overloading of the sewer beyond its design capacity
due to inflow and infiltration of water.
◍ what is the color of a pond that is operating properly?.
Answer: deep green color
◍ which gas diminished your sense of smell?.
Answer: hydrogen sulfide
◍ what are the main sources of domestic sewage in the collection system?.
Answer: households and commercial establishments
◍ what is the difference between the sludge from a primary clarifier and
secondary clarifier?.
Answer: primary sludge is denser than secondary sludge
◍ Inspect all equipment for proper operation.
Answer: What is one thing an operator of a small wastewater plant should
include on their daily duty list?
◍ what is the purpose of a parshall flume.
Answer: Measure flow rate
◍ What is freeboard in a waste stabilization pond?.
Answer: the vertical distance from normal water surface to the top of the
SCRIPT 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◍ what happens when there is more food in the influent to the aeration tank?.
Answer: more oxygen is required in the aeration tank
◍ what could happen if the volatile acid/alkalinity ratio starts to increase, and
corrective action is not taken immediately?.
Answer: carbon dioxide content in the digester gas will increase
◍ what causes primary effluent to become black and odorous?.
Answer: improper sludge removal from the clarifier
◍ Proportional composite samples.
Answer: What is the best sampling method for BOd and suspended solids
testing
◍ What are collids?.
Answer: very small, finely divided solids that remain dispersed in a liquid
for a long time
◍ what is true during the colder winter months?.
Answer: Modify operations to increase solids under aeration to provide
more microorganisms to treat the BOD
◍ Wear rings.
Answer: Used in a centrifugal pump to prevent internal leakage and is
usually made of bronze or cast iron. Replaceable rings that are attached to
the impeller and/or the pump casing to allow a small running clearance
between the impeller and pump casing without causing wear of the actual
impeller or pump casing material. In a centrifugal pump are designed to
, prevent excessive internal water circulation between the suction and
discharge sides of a pump and to prevent wear of the impeller and inside
case.
◍ which of the following enters the headworks of a treatment plant?.
Answer: influent
◍ Gravity and evaporation.
Answer: How does the dewatering process occur after the digested sludge is
applied to a sand drying bed?
◍ Turbidity to increase in the final effluence.
Answer: inadequate air supply in an activated sludge system will cause
◍ what should you do if there is a thick, dark foam on the surface of an
aeration tank?.
Answer: increase sludge wasting
◍ what is used to control filamentous organisms?.
Answer: chlorine
◍ 80%-90%.
Answer: What BOD efficiencies can be expected from a convential trickling
filter plant?
◍ what must you do before entering a room with harmful concentration of
chlorine gas in the air?.
Answer: wear self-contained breathing apparatus (SCBA)
◍ A decrease of dissolved oxygen residual in the aeration tank.
Answer: If an operator were to receive a high organic waste load at an
activated sludge plant, what would be the first indicators?
◍ CaCO3 (Calcium Carbonate) Alkalinity.
Answer: What is the best test to perform that would indicate water quality
while monitoring nitrogen oxidation and the nitrification/denitrification
process?
◍ who must be included in a hearing conservation program to prevent hearing
, loss?.
Answer: employees whose normal noise exposure equals or exceeds an
8-hour time-weighted average of 85 decibels
◍ Excessive weed growthPoor arrangement of inlet and outletIrregular pond
bottom.
Answer: Which three are possible causes of "short circuiting" in a pond
Excessive weed growth High influent BODPoor arrangement of inlet and
outlet Irregular pond bottom
◍ what is accomplished by the activated sludge process?.
Answer: remove soluble or finely divided suspended materials
◍ Surcharge.
Answer: refers to the overloading of the sewer beyond its design capacity
due to inflow and infiltration of water.
◍ what is the color of a pond that is operating properly?.
Answer: deep green color
◍ which gas diminished your sense of smell?.
Answer: hydrogen sulfide
◍ what are the main sources of domestic sewage in the collection system?.
Answer: households and commercial establishments
◍ what is the difference between the sludge from a primary clarifier and
secondary clarifier?.
Answer: primary sludge is denser than secondary sludge
◍ Inspect all equipment for proper operation.
Answer: What is one thing an operator of a small wastewater plant should
include on their daily duty list?
◍ what is the purpose of a parshall flume.
Answer: Measure flow rate
◍ What is freeboard in a waste stabilization pond?.
Answer: the vertical distance from normal water surface to the top of the
