INDUSTRIAL WASTEWATER OPERATOR
UPDATED SCRIPT 2026 PRACTICE
SOLUTIONS GRADED A+
● composite sample. Answer: sample combined from multiple grab
samples
● grab sample. Answer: 1 sample representative of current conditions
● Dissolved Oxygeb. Answer: measure of the amount of oxygen
dissolved in water (mg/l)
● effluent. Answer: treated water discharged from a treatment plant
● eutrophication. Answer: excissive growth of plant/algae in receiving
waters due to dissolved nutrients and their decomposition
● flume. Answer: restriction in open channel used to measure flow
● food to mixroorganism ratio. Answer: amount of BOD provided to the
MLVSS or MLSS
, ● Hydraulic Rentention Time. Answer: period of time that wastewater
stays in tank
● influent. Answer: raw wastewater entering treatment process
● pH. Answer: measure of the acidity or alkalinity of a sample
● septage. Answer: high strength waste pumped out of sptic tanks
● sludge age. Answer: MLSS divided by WAS
● weir. Answer: level control structure used to provide uniform flow
● combined sewer. Answer: pipes that carry both wastewater and
stormwater
● Inflow and Infiltration. Answer: any unwanted Clearwater that leaks
unto collection system
● lift station. Answer: underground chamber with pumps used to elevate
wastewater
UPDATED SCRIPT 2026 PRACTICE
SOLUTIONS GRADED A+
● composite sample. Answer: sample combined from multiple grab
samples
● grab sample. Answer: 1 sample representative of current conditions
● Dissolved Oxygeb. Answer: measure of the amount of oxygen
dissolved in water (mg/l)
● effluent. Answer: treated water discharged from a treatment plant
● eutrophication. Answer: excissive growth of plant/algae in receiving
waters due to dissolved nutrients and their decomposition
● flume. Answer: restriction in open channel used to measure flow
● food to mixroorganism ratio. Answer: amount of BOD provided to the
MLVSS or MLSS
, ● Hydraulic Rentention Time. Answer: period of time that wastewater
stays in tank
● influent. Answer: raw wastewater entering treatment process
● pH. Answer: measure of the acidity or alkalinity of a sample
● septage. Answer: high strength waste pumped out of sptic tanks
● sludge age. Answer: MLSS divided by WAS
● weir. Answer: level control structure used to provide uniform flow
● combined sewer. Answer: pipes that carry both wastewater and
stormwater
● Inflow and Infiltration. Answer: any unwanted Clearwater that leaks
unto collection system
● lift station. Answer: underground chamber with pumps used to elevate
wastewater
