WorksheetsNutrient removal
Total questions: 26
Worksheet time: 14mins
What are the main elements to be removed during wastewater treatment?
H & M
N & P
Na & K
Heavy metals
Which type of bacteria is characterized by high phosphorus uptake?
PAOs – Phosphate-accumulating organisms
EBPR
Organisms present in standard active sludge
In which phase PAOs are able to accumulate large amount of phosphorus
Both
Anaerobic
Aerobic
Why anaerobic phase is crucial for EBPR process:
PAOs are able to consume and discharge their “batteries”
Phosphate is turned into more digestible form
They are able to grow in this phase.
Does PAOs pollute water with phosphate at some point?
Yes, phosphate is environment friendly compound
No, they only accumulate phosphate
Yes, but they collect it later in much larger amounts
Nutrient removal treatment is ________________.
Primary treatment
Tertiary treatment
Preliminary Treatment
Secondary Treatment
Which nitrogen cycle process is occurring when bacteria convert ammonium to nitrite and then into nitrate?
nitrogen fixation
nitrification
denitrification
ammonification
assimilation
Select all answers below that are stages of the nitrogen cycle.
Nitrogen fixation
Diffusion
Ammonification
Nitrification
(a) converts ammonia and ammonium into nitrite and nitrate.
Which process makes nitrites from ammonia?
ammonification
denitrification
nitrification
nitrogen fixation
The phosphorus cycle occurs much more quickly than the carbon and nitrogen cycles.
true
false
Too much phosphorus in waterways (rivers, lakes) can lead to___________.
eutrophication
Nothing
Death
diseases
This process converts nitrates to nitrogen gas
nitrification
denitrification
ammonification
nitrogen cycle
What are the possible reason the nitrate in the effluent is increasing?
anoxic zone is not developing
decrease aeration
aeration is insufficient
BOD in influent may be lower than usual
What are the possible solutions should the ammonia in the effluent increases above 2 mg/L?
Increase aeration
Increase SRT
Shut down the plant
decrease aeration
What are the possible solution if small bits of floating sludge are observed on the clarifier surface?
Reduce SRT in clarifier
Increase SRT in clarifer
Increase sludge recycle rate
Reduce sludge recycle rate
What is the primary role of denitrifying bacteria in the nitrogen cycle?
Convert nitrate to nitrogen gas
Convert nitrogen gas to ammonia
Fix atmospheric nitrogen into organic compounds
Which process is responsible for the conversion of organic nitrogen into ammonium?
nitrification
ammonification
denitrification
nitrogen fixation
Excessive nitrogen in water bodies can lead to which environmental issue?
global warming
eutrophication
ozone depletion
acid rain
What is the main consequence of excessive phosphorus in aquatic ecosystems?
Improved water quality
Eutrophication
Decreased oxygen levels
Increased biodiversity
Which type of nitrogen cycle process involves the conversion of nitrate back to nitrogen gas?
Nitrification
Ammonification
Denitrification
Assimilation
What role do decomposers play in the nitrogen cycle?
They convert nitrogen gas into ammonia
They consume nitrates and release oxygen
They break down organic matter and release nitrogen
They fix atmospheric nitrogen into the soil
What is the primary purpose of secondary wastewater treatment?
Remove solids
Remove nutrients
Reduce organic matter
Disinfect water
Which process in the nitrogen cycle is primarily responsible for the conversion of nitrogen gas into ammonia?
Nitrification
Denitrification
Nitrogen fixation
Ammonification
What is a common indicator of water quality that is affected by nutrient pollution?
Salinity
Dissolved oxygen
Temperature
pH levels
