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14. Nutrient Pollution to spec

A Level Environmental Science revision
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stwvlker
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Last updated: May 18, 2025
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First submittedApril 22, 2025
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Hint
Answer
Nitrate sources
Manure
Nitrate sources
Fertilisers
Nitrate sources
Leachate
Nitrate sources
Runoff
Phosphate sources
Sewage effluent
Effects
Cultural eutrophication
Effects
Food webs
Define eutrophication (8 words)
Excessive nutrient enrichment causing algal blooms and oxygen depletion
____ and __________ absorb dissolved _______ and grow _____
Algae, cyanobacteria, nutrients, rapidly
__________ releases ____ that harmful to ______ and ______
Cyanobacteria, toxins, humans, animals
Floating algae shades...
Submerged and benthic macrophytes
Anaerobic decay causes...
Deoxygenation
Human impacts
Blue baby syndrome
Human impacts
Possible carcinogen
Blue baby syndrome: ___ ______ converts ______ to ___ which reacts with _________ and reduces oxygen carrying capacity
Gut bacteria, nitrates, NOx, haemoglobin
Controls
Low-solubility fertilisers
Controls
Fertiliser application timing
Controls
Ploughing timing
Controls
Legume cultivation
Controls
Nitrate vulnerable zones
Controls
Iron phosphate precipitation
X precipitates phosphates from a liquid as sediments that can be dredged
Iron (III) sulfate
ORGANIC NUTRIENTS SAY YAY
YAY
Organic wastes
Sewage
Organic wastes
Manure
Organic wastes
Silage fluids
Organic wastes
Paper industry
Effects (5 words)
Deoxygenation from microbial aerobic decomposition
Deoxygenation kills ______ _________, causing __________ as ____ releases _______ nutrients
Aerobic organisms, eutrophication, decay, inorganic
Organic wastes may contain...
Pathogens
Pathogen examples
Chloera
Pathogen examples
Typhoid
Major treatment stages
Pre-treatment
Hint
Answer
Major treatment stages
Primary treatment
Major treatment stages
Secondary treatment
Major treatment stages
Tertiary treatment
Major treatment stages
Sludge digestion
Pre-treatment goals
Remove solids
Primary treatment goals
Remove 95% organic matter
Secondary treatment goals (5 words)
Digestion of remaining organic matter
Tertiary treatment goals
Remove inorganic nutrients
Pre-treatment steps
Screens
Pre-treatment steps
Grit traps
Primary treatment steps
Sedimentation tanks
Secondary treatment steps
Aeration tanks
Secondary treatment steps
Secondary sedimentation tanks
Secondary treatment steps
Trickling filter beds
Tertiary treatment steps
Phosphate removal
Tertiary treatment steps
Bacterial microfilters
Tertiary treatment steps
Sterilisation
Grit traps: the ______ _____ so grit is _______ as water loses ______ ______
Channel widens, deposited, kinetic energy
Primary sedimentation tanks: ______ ____ sink to the bottom to be treated separately as ______
Faecal solids, sludge
Aeration tanks (6 words)
Aerobic bacterial decomposition by activated sludge
Aeration tank methods to aerate
Paddles
Aeration tank methods to aerate
O2 bubbling
Secondary sedimentation tanks: _________ _______ is returned as _______ _____, clear effluent can be discharged
Suspended bacteria, activated sludge
Trickling filter beds: _______ ___ spray effluent over _________ ____ of _____
Rotating arms, cylindrical tanks, gravel
Phosphate removal methods (2)
Iron (III) sulfate, microstrainers
Sludge treatment: ________ _______ digest sludge in a ____ digestion tank for __ weeks
Anaerobic microbes, warm, 4 weeks
Sludge treatment goals
Reduce pathogens
Sludge treatment goals
Reduce odours
Sludge treatment goals
Reduce volume
Sludge disposal
Landfill
Sludge disposal
Dispersal into the sea
Sludge disposal
Incineration
Sludge disposal
Agricultural use
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