Role Of Micro-Organisms In Waste Management And Pollution Control Flashcards
How is most of our waste disposed of?
It is disposed of in landfill sites
What happens to waste in landfill sites?
It is covered with soil. Bacteria and fungi in the soil break down the organic (biodegradable) materials.
What is present in the soil in landfill sites?
bacteria and fungi
What is sewage?
Sewage is waste from toilets, bathrooms or industry and rainwater from drains.
what does primary sewage treatment involve?
It involves physically screening or filtering waste and allowing it to settle. This removes large objects and solids.
What is the aim of primary sewage treatment?
To remove large objects and solids
What happens during secondary sewage treatment?
This occurs when the waste is acted on by bacteria and fungi of decay. The liquid waste is aerated to allow this to happen. This biological treatment breaks down most of the organic matter.
Why must secondary sewage waste be aerated?
The waste is acted on by bacteria and fungi of decay. The liquid waste is aerated to allow this to happen.
What is the purpose of secondary sewage treatment?
This biological treatment breaks down most of the organic matter.
What happens to the remaining sewage after it has gone through primary and secondary sewage treatment?
The sludge is disposed of and the cleaned water is treated with chlorine to destroy any remaining organisms
What is sometimes used to remove mineral nutrients from water?
Tertiary sewage treatment
Give 2 examples of mineral nutrients in waste.
phosphates and nitrates
Why is water treated with chlorine?
To destroy any remaining organisms
