Pollution and Waste Management (Leaving Cert Biology): Flashcards
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Pollution definition
Pollution definition
Any undesirable change or harmful addition to environment
Eutrophication definition
Eutrophication definition
Artificial enrichment of water by nutrients
Cause of eutrophication
Cause of eutrophication
Fertilisers washed into water cause algae growth
Why eutrophication causes death
Why eutrophication causes death
Bacteria decompose algae, use up oxygen, plants & animals die
Preventing eutrophication
Preventing eutrophication
Spread fertiliser in dry weather, use limited amounts
Conservation definition
Conservation definition
Wise management of natural resources for species survival
Overfishing solution
Overfishing solution
Increase mesh size so young fish escape, grow & reproduce
Three Rs of waste control
Three Rs of waste control
Reduce, Reuse, Recycle
Role of bacteria & fungi in landfills
Role of bacteria & fungi in landfills
Break down biodegradable materials in soil
Sludge in sewage treatment
Sludge in sewage treatment
Solid waste that settles during sedimentation
Secondary treatment biogas use
Secondary treatment biogas use
Methane collected, used as fuel for electricity
Secondary treatment: % organic waste removed
Secondary treatment: % organic waste removed
Up to 98%
Chlorine use in secondary treatment
Chlorine use in secondary treatment
Destroys remaining organisms in water
Tertiary treatment purpose
Tertiary treatment purpose
Removes mineral nutrients (nitrogen & phosphorus)
Why tertiary treatment rarely used
Why tertiary treatment rarely used
High cost