WASTEWATER TEST ACTUAL EXAM PAPER
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ Detritus is noticed in your grit channel. What is the problem?.
Answer: Velocity too low with long detention time
◍ Identify the 3 basic types of lift stations.
Answer: Dry, Wet and pneumatic
◍ What is typically used whenever wastewater cannot flow to the treatment
plant by gravity.
Answer: Lift station
◍ Starting this type of pump against a closed valve can cause major damage to
the pump, pump piping, the operator, or all three.
Answer: Positive displacement pump
◍ What is the funnel called that is used along with the vacuum apparatus when
doing solids testing?.
Answer: Büchner funnel
◍ In most activated sludge treatment plants the major cause of repeated sludge
bulking is?.
Answer: High F/M loading rate and low MCRT
◍ When charging a lead-acid type battery for a composite sampler, what
dangerous gas could be produced?.
Answer: Hydrogen
◍ What is a spectrophotometer used to measure?.
Answer: Color intensity of a chemical solution
◍ CL2 combined with ammonia forms what?.
, Answer: Chloramines
◍ What is the primary cause of stoppage in a collection system.
Answer: grease and roots
◍ Effluent dosage of chlorine in the contact chamber must produce a total
combined residual of ?.
Answer: 1.0mg/L after 20 minutes
◍ What are the principal nutrients that must be removed from effluent before it
is safe for discharge to florida water?.
Answer: Nitrogen and Phosphorus
◍ SVI is best defined as?.
Answer: The tendency of activated solids to thicken or to become
concentrated during the sedimentation/thickening process
◍ Odors occur when treatment becomes.
Answer: Anaerobic
◍ The operator would need to increase or decrease if the ? loading on the plant
is high.
Answer: increase/Organic
◍ What type of gas is very toxic and deadens the sense of ?.
Answer: Hydrogen sulfide/smell
◍ What diseases are caused by pathogenic organisms that may be present in
raw wastewater?.
Answer: Hepatitis, typhoid, paratyphoid, dysentery, and cholera
◍ If a pump takes 30 seconds to fill a 5-gallon bucket, what is the pumping
rate in gallons per minute?.
Answer: 10GPM 5/ .5 minutes (30 seconds) = 10 GPM
◍ Coliform bacteria are used for what?.
Answer: Indicators of possible presence of pathogenic organisms
◍ The chlorine residual is falling, and inspection of the 150LB cylinder and
, chlorine feed equipment shows ice forming on the chlorine regulator and
feed lines. The BEST method to fix the falling chlorine residual is to:.
Answer: Place a second chlorine cylinder online
◍ Organic solids include.
Answer: organic materials from plant, animals or humans
◍ How many feet must new manholes have an inside diameter of? Entry
access must be at least how many inches?.
Answer: 4 feet and 30 inches
◍ One common type of weir design for measuring flow is.
Answer: V-Knotch
◍ What happens to the chlorine residual when the organic content in the
effluent goes up?.
Answer: The residual goes down
◍ TCEQ allows the reuse of wastewater, some of these uses include.
Answer: irrigation, aquifer recharge, cooling towers and fire protection
◍ Chlorine residual can be measured in several ways, including the use of
DPD reagent, spectrophotometers and iodometric titration. Which of the
following is also an approved method?.
Answer: Amperometric Titration
◍ What is the dosage of chlorine, in mg/L, if the flow being treated is 85,000
GPD and 3 pounds of chlorine are used per day?.
Answer: 4.2 mg/L
◍ Why is the discharge of wastewater containing phosphorus to receiving
water of concern?.
Answer: May stimulate growth of nuisance quantities of algae
◍ The majority of Dissolved Oxygen in raw sewage come from.
Answer: Potable drinking water
◍ If the operator of a system received a call that a lift station is production of a
strong smell of "Rotten eggs" this would be an indication that.
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ Detritus is noticed in your grit channel. What is the problem?.
Answer: Velocity too low with long detention time
◍ Identify the 3 basic types of lift stations.
Answer: Dry, Wet and pneumatic
◍ What is typically used whenever wastewater cannot flow to the treatment
plant by gravity.
Answer: Lift station
◍ Starting this type of pump against a closed valve can cause major damage to
the pump, pump piping, the operator, or all three.
Answer: Positive displacement pump
◍ What is the funnel called that is used along with the vacuum apparatus when
doing solids testing?.
Answer: Büchner funnel
◍ In most activated sludge treatment plants the major cause of repeated sludge
bulking is?.
Answer: High F/M loading rate and low MCRT
◍ When charging a lead-acid type battery for a composite sampler, what
dangerous gas could be produced?.
Answer: Hydrogen
◍ What is a spectrophotometer used to measure?.
Answer: Color intensity of a chemical solution
◍ CL2 combined with ammonia forms what?.
, Answer: Chloramines
◍ What is the primary cause of stoppage in a collection system.
Answer: grease and roots
◍ Effluent dosage of chlorine in the contact chamber must produce a total
combined residual of ?.
Answer: 1.0mg/L after 20 minutes
◍ What are the principal nutrients that must be removed from effluent before it
is safe for discharge to florida water?.
Answer: Nitrogen and Phosphorus
◍ SVI is best defined as?.
Answer: The tendency of activated solids to thicken or to become
concentrated during the sedimentation/thickening process
◍ Odors occur when treatment becomes.
Answer: Anaerobic
◍ The operator would need to increase or decrease if the ? loading on the plant
is high.
Answer: increase/Organic
◍ What type of gas is very toxic and deadens the sense of ?.
Answer: Hydrogen sulfide/smell
◍ What diseases are caused by pathogenic organisms that may be present in
raw wastewater?.
Answer: Hepatitis, typhoid, paratyphoid, dysentery, and cholera
◍ If a pump takes 30 seconds to fill a 5-gallon bucket, what is the pumping
rate in gallons per minute?.
Answer: 10GPM 5/ .5 minutes (30 seconds) = 10 GPM
◍ Coliform bacteria are used for what?.
Answer: Indicators of possible presence of pathogenic organisms
◍ The chlorine residual is falling, and inspection of the 150LB cylinder and
, chlorine feed equipment shows ice forming on the chlorine regulator and
feed lines. The BEST method to fix the falling chlorine residual is to:.
Answer: Place a second chlorine cylinder online
◍ Organic solids include.
Answer: organic materials from plant, animals or humans
◍ How many feet must new manholes have an inside diameter of? Entry
access must be at least how many inches?.
Answer: 4 feet and 30 inches
◍ One common type of weir design for measuring flow is.
Answer: V-Knotch
◍ What happens to the chlorine residual when the organic content in the
effluent goes up?.
Answer: The residual goes down
◍ TCEQ allows the reuse of wastewater, some of these uses include.
Answer: irrigation, aquifer recharge, cooling towers and fire protection
◍ Chlorine residual can be measured in several ways, including the use of
DPD reagent, spectrophotometers and iodometric titration. Which of the
following is also an approved method?.
Answer: Amperometric Titration
◍ What is the dosage of chlorine, in mg/L, if the flow being treated is 85,000
GPD and 3 pounds of chlorine are used per day?.
Answer: 4.2 mg/L
◍ Why is the discharge of wastewater containing phosphorus to receiving
water of concern?.
Answer: May stimulate growth of nuisance quantities of algae
◍ The majority of Dissolved Oxygen in raw sewage come from.
Answer: Potable drinking water
◍ If the operator of a system received a call that a lift station is production of a
strong smell of "Rotten eggs" this would be an indication that.
