Which provides a better composite representative:
A. A smaller sample collected more often
B. A larger sample collected less often - ANSWER A smaller sample collected more often
Which part of the treatment process uses biological processes?
A: Primary
B: Secondary
C: Tertiary
D: WAS - ANSWER Secondary
The activated sludge (bio mass) collected in the final clarifier and returned to the secondary
treatment process to mix with the incoming wastewater is:
A: Mixed Liquor Suspended Solids (MLSS)
B: Waste Activated Sludge (WAS)
C: Return Activated Sludge (RAS)
D: Mixed Liquor Volatile Suspended Solids (MLSS) - ANSWER Return Activated Sludge
(RAS)
Define primary treatment - ANSWER Clarification by solid and liquid separation that re-
moves a substantial amount of suspended and floating matter.
True or False: Disinfection destroys all microorganisms? - ANSWER False
What type of solids does a clarifier remove? - ANSWER Floating and settled
1
,Define F:M using BOD and MLSS - ANSWER F:M is the food:microorganism ratio where
the 'food' is BOD and the microorganisms are the MLSS/MLVSS.
What is a restriction in an open channel used to measure flow?
A: Weir
B: Box cord
C: Packing
D: Flume - ANSWER Flume
What is a selector? - ANSWER Part of the treatment system that selects a specific type of
organism by providing an environment (Anaerobic, anoxic, or aerobic) that favors its growth.
_____ are flows generated within the plant, usually from solids processing that has been re-
cycled back through the plant. - ANSWER Sidestreams
_____ is the treatment process that uses physical, chemical, or biological processes to re-
move suspended solids and nutrients in wastewater to accomplish a level of treatment
greater than what can be accomplished by secondary treatment.
A: Primary treatment
B: Disinfection
C: Tertiary treatment
D: Sour treatment - ANSWER Tertiary treatment
The activated sludge (except biomass or cell mass) removed from the secondary treatment
process.
A: Mixed Liquor Suspended Solids (MLSS)
B: Waste Activated Sludge (WAS)
C: Return Activated Sludge (RAS)
2
, D: Mixed Liquor Volatile Suspended Solids (MLSS) - ANSWER Waste Activated Sludge
(WAS)
What are the two main reasons for treating wastewater? - ANSWER To protect public
health by destroying pathogens and to protect the environment by removing pollutants.
Discuss the effect of I&I on a collection system - ANSWER (1)Exceed capacity of the pipes
= sanitary sewer overflows (SSO).
(2) Very high flows entering the treatment facility can lead to too much flow going through
aeration basins and clarifiers washing out solids, creating a loss of treatment efficiency
A structure that allows a pipe to dip below an obstruction by forming a "U" shaped path. Liq-
uid flowing in one end is forced up and out the over. It is typically used in collections when
there is a river or other deep obstructions.
A: Gate Valve Structure
B: Torque Wrench
C: Pathfinder
D: Inverted Siphon - ANSWER Inverted Siphon
Fill in the general characteristics for domestic wastewater: (mg/L)
BOD: ______
TSS: ______
Total Nitrogen: _______
Ammonia: ________
Total P: _______
FOG: ______
3
A. A smaller sample collected more often
B. A larger sample collected less often - ANSWER A smaller sample collected more often
Which part of the treatment process uses biological processes?
A: Primary
B: Secondary
C: Tertiary
D: WAS - ANSWER Secondary
The activated sludge (bio mass) collected in the final clarifier and returned to the secondary
treatment process to mix with the incoming wastewater is:
A: Mixed Liquor Suspended Solids (MLSS)
B: Waste Activated Sludge (WAS)
C: Return Activated Sludge (RAS)
D: Mixed Liquor Volatile Suspended Solids (MLSS) - ANSWER Return Activated Sludge
(RAS)
Define primary treatment - ANSWER Clarification by solid and liquid separation that re-
moves a substantial amount of suspended and floating matter.
True or False: Disinfection destroys all microorganisms? - ANSWER False
What type of solids does a clarifier remove? - ANSWER Floating and settled
1
,Define F:M using BOD and MLSS - ANSWER F:M is the food:microorganism ratio where
the 'food' is BOD and the microorganisms are the MLSS/MLVSS.
What is a restriction in an open channel used to measure flow?
A: Weir
B: Box cord
C: Packing
D: Flume - ANSWER Flume
What is a selector? - ANSWER Part of the treatment system that selects a specific type of
organism by providing an environment (Anaerobic, anoxic, or aerobic) that favors its growth.
_____ are flows generated within the plant, usually from solids processing that has been re-
cycled back through the plant. - ANSWER Sidestreams
_____ is the treatment process that uses physical, chemical, or biological processes to re-
move suspended solids and nutrients in wastewater to accomplish a level of treatment
greater than what can be accomplished by secondary treatment.
A: Primary treatment
B: Disinfection
C: Tertiary treatment
D: Sour treatment - ANSWER Tertiary treatment
The activated sludge (except biomass or cell mass) removed from the secondary treatment
process.
A: Mixed Liquor Suspended Solids (MLSS)
B: Waste Activated Sludge (WAS)
C: Return Activated Sludge (RAS)
2
, D: Mixed Liquor Volatile Suspended Solids (MLSS) - ANSWER Waste Activated Sludge
(WAS)
What are the two main reasons for treating wastewater? - ANSWER To protect public
health by destroying pathogens and to protect the environment by removing pollutants.
Discuss the effect of I&I on a collection system - ANSWER (1)Exceed capacity of the pipes
= sanitary sewer overflows (SSO).
(2) Very high flows entering the treatment facility can lead to too much flow going through
aeration basins and clarifiers washing out solids, creating a loss of treatment efficiency
A structure that allows a pipe to dip below an obstruction by forming a "U" shaped path. Liq-
uid flowing in one end is forced up and out the over. It is typically used in collections when
there is a river or other deep obstructions.
A: Gate Valve Structure
B: Torque Wrench
C: Pathfinder
D: Inverted Siphon - ANSWER Inverted Siphon
Fill in the general characteristics for domestic wastewater: (mg/L)
BOD: ______
TSS: ______
Total Nitrogen: _______
Ammonia: ________
Total P: _______
FOG: ______
3
