WasteWater Operator Certification Study
Guide Grade 1 Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
WasteWater Sources & Characteristics:
What is the most common reason for a wastewater to contain intermittent large amounts of
sand, gravel, and grit? - CORRECT ANSWER storm events
WasteWater Sources & Characteristics:
Combined wastewater is defined as - CORRECT ANSWER sanitary wastewater and
stormwater runoff
WasteWater Sources & Characteristics:
In general, the solids content in wastewater is about - CORRECT ANSWER 0.1%
WasteWater Sources & Characteristics:
In general, what is the % of suspended solids in the total amount of solids - CORRECT
ANSWER 30%
WasteWater Sources & Characteristics:
Generally, the % of dissolved solids in the amount of total solids is about - CORRECT
ANSWER 70%
WasteWater Sources & Characteristics:
,Which type of organisms would most probably be associated with poor treatment or young
biomass - CORRECT ANSWER amoebas
WasteWater Sources & Characteristics:
Which type of organisms would most probably be associated with very clear plant effluent.
low BOD and low amounts of suspended solids - CORRECT ANSWER stalked cilates
Basic WasteWater Treatment:
Aerobic bacteria will reproduce and live in an environment that contains only - CORRECT
ANSWER oxygen
Basic WasteWater Treatment:
Anaerobic bacteria will reproduce and live only in an environment that completely lacks -
CORRECT ANSWER free or dissolved oxygen
Basic WasteWater Treatment:
The biochemical oxygen demand (BOD) test usually has a specific time of - CORRECT
ANSWER 5 days
Basic WasteWater Treatment:
An Imhoff cone measures - CORRECT ANSWER volume of settleable solids
Basic WasteWater Treatment:
Septic conditions are caused by - CORRECT ANSWER anaerobic bacteria
, Basic WasteWater Treatment:
Scum is usually removed in the _____treatment stage - CORRECT ANSWER primary
Basic WasteWater Treatment:
When domestic wastewater enters natural waters, what species deplete most of the oxygen -
CORRECT ANSWER aerobic bacteria
Basic WasteWater Treatment:
Once the oxygen is depleted in a natural body of water, which organisms take over? -
CORRECT ANSWER anaerobic
Basic WasteWater Treatment:
The major gas produces by anaerobic decomposition is - CORRECT
ANSWER methane
Wastewater Treatment Facilities:
Another name for promary treatment is - CORRECT ANSWER sedimentation
Wastewater Treatment Facilities:
Digester gas is_______when mixed with air the the proper proportions - CORRECT
ANSWER extremely explosive
Wastewater Treatment Facilities:
Guide Grade 1 Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
WasteWater Sources & Characteristics:
What is the most common reason for a wastewater to contain intermittent large amounts of
sand, gravel, and grit? - CORRECT ANSWER storm events
WasteWater Sources & Characteristics:
Combined wastewater is defined as - CORRECT ANSWER sanitary wastewater and
stormwater runoff
WasteWater Sources & Characteristics:
In general, the solids content in wastewater is about - CORRECT ANSWER 0.1%
WasteWater Sources & Characteristics:
In general, what is the % of suspended solids in the total amount of solids - CORRECT
ANSWER 30%
WasteWater Sources & Characteristics:
Generally, the % of dissolved solids in the amount of total solids is about - CORRECT
ANSWER 70%
WasteWater Sources & Characteristics:
,Which type of organisms would most probably be associated with poor treatment or young
biomass - CORRECT ANSWER amoebas
WasteWater Sources & Characteristics:
Which type of organisms would most probably be associated with very clear plant effluent.
low BOD and low amounts of suspended solids - CORRECT ANSWER stalked cilates
Basic WasteWater Treatment:
Aerobic bacteria will reproduce and live in an environment that contains only - CORRECT
ANSWER oxygen
Basic WasteWater Treatment:
Anaerobic bacteria will reproduce and live only in an environment that completely lacks -
CORRECT ANSWER free or dissolved oxygen
Basic WasteWater Treatment:
The biochemical oxygen demand (BOD) test usually has a specific time of - CORRECT
ANSWER 5 days
Basic WasteWater Treatment:
An Imhoff cone measures - CORRECT ANSWER volume of settleable solids
Basic WasteWater Treatment:
Septic conditions are caused by - CORRECT ANSWER anaerobic bacteria
, Basic WasteWater Treatment:
Scum is usually removed in the _____treatment stage - CORRECT ANSWER primary
Basic WasteWater Treatment:
When domestic wastewater enters natural waters, what species deplete most of the oxygen -
CORRECT ANSWER aerobic bacteria
Basic WasteWater Treatment:
Once the oxygen is depleted in a natural body of water, which organisms take over? -
CORRECT ANSWER anaerobic
Basic WasteWater Treatment:
The major gas produces by anaerobic decomposition is - CORRECT
ANSWER methane
Wastewater Treatment Facilities:
Another name for promary treatment is - CORRECT ANSWER sedimentation
Wastewater Treatment Facilities:
Digester gas is_______when mixed with air the the proper proportions - CORRECT
ANSWER extremely explosive
Wastewater Treatment Facilities:
