WASTEWATER TREATMENT
OPERATOR EXAM
COMPREHENSIVE QUESTIONS
ACCURATE ANSWERS
◉ 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
OPERATOR EXAM
COMPREHENSIVE QUESTIONS
ACCURATE ANSWERS
◉ 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
