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WorksheetsActivated Sludge I
Total questions: 24
Worksheet time: 12mins
Activated sludge process degrade organics and _________
Improve nutrients
Remove nutrients
Remove odour
Remove taste
What is required to keep the activated sludge suspended?
Carbon-dioxide
Nitrogen
Oxygen
Ammonia
What does the bacterium use to grow?
Oxygen
Organic pollutants
Water
Carbon-dioxide
Activated sludge process can be used for treating all types of wastewater.
True
False
________ combines aeration basin and secondary clarifier into single unit.
Primary clarifier
Aerobic unit
Sequential batch reactor
Secondary clarifier
What does SBR stand for?
Secondary batch reactor
Sequential biological reactor
Secondary biological reactor
Sequential batch reactor
SBR operates as ________ process.
Batch
Continuous
Semi-continuous
Discontinuous
When the aeration system shuts off, the basin begins to perform as a ______
Primary clarifier
Secondary clarifier
Anaerobic unit
Aeration unit
_______ provides the dual purpose of providing DO and mixing of the mixed liquor and wastewater.
Flocculation
Aeration
Sedimentation
Clarification
Why is the sludge aerated?
To avoid bacterial growth
To increase bacterial growth
To maintain pH
To maintain temperature
________ is treated in activated sludge reactor.
Pre-treated sludge
Treated sludge
Macronutrients
Micro-organisms
After the treatment, the BOD demand ______
Remains constant
Decreases
Increases
Alters
Which is the next reactor after activated sludge reactor in the treatment process?
Flocculation unit
Aeration unit
Clarifier
Disinfection unit
Where is the sludge at the bottom of the clarifier processed to?
Settling unit
Aerator
Flocculation unit
Disinfection unit
Which of these is not an alternative to activated sludge treatment systems?
Stabilization ponds
Rotating biological reactors
Trickling filter
Screening units
An activated sludge system consists of two components, an aerator and ________
Screening units
Disinfection unit
Flocculation unit
Clarifier
How is air pumped in the aerator unit?
Bubbled from bottom
Sides
Bubbled from top
Sprayed
Which are the three ingredients in activated sludge systems?
Cells, sewage and oxygen
Cells, sewage and nitrogen
Solids, sewage and oxygen
Solids, water and oxygen
The organisms feed on _____ in aeration tanks.
Water
Air
Sludge particles
Bacteria
Which of the following is the correct expression of the aeration period in hours?
V/Q
24V/Q
V/24Q
Q/V
Which of the following activated sludge process has minimum food to microorganism ratio?
Extended aeration
Step aeration
Modified aeration
Conventional
The organic loading in an activated sludge plant is defined as ___________
Mass of BOD per day/Volume of the aeration tank
Volume of aeration tank/Mass of BOD per day
The mass of BOD per day/Volume of secondary clarifier
Aeration period * Volume of aeration tank
Which of the following sludge process has maximum aeration period?
Conventional process
Extended process
Step aeration process
Tapered aeration
Activated sludge process uses micro-organisms to degrade organics from wastewater
True
False
