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I/GCSE Biology - Recycling issues

Recycling issues

· igcse biology,gcse biology,recycling issues,organic waste,decay

In this blog post, we will talk about the recycling issues in I/GCSE Biology. Let's get started! 🐒

The problem with organic waste

In I/GCSE Biology exam, don't forget to remember what organic waste is!

In UK - over 7.6 million tonnes of food wasted !!!!!!

  • Do you remember what decay is in I/GCSE Biology?
  • Food + drink wastes ➡️ organic – originally come from plants / animals
  • Waste decay as bacteria, fungi grow on them
  • Most UK waste disposed in landfill sites
  1. once organic waste buried, decay organisms can’t grow
  2. not enough oxygen for aerobic respiration
  • Decay method
  1.  methanogens can grow anaerobically
  2.  release methane (flammable + global warming)
  • Meat waste attractive to pests e.g. rats, councils ask to separate waste e.g. cans, glass, food etc.

Landfill tips vented in a controlled way for many years after tipping has ended, otherwise methane that forms as the refuse decays might explode or create fires that burn below the surface for weeks.

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A selection of choices

It is also important to remember the following points in I/GCSE Biology!

Manage garden + vegetable kitchen waste

  • ➡️ compost heap – waste piled up and microbial decay breaks it down into compost

Councils collect this as green waste

  1. make compost in large scale, process called windrow composting
  2. needs space + compost material turned regularly (keep oxygen level hug) no special equipment needed
  3. Windrow composting - outdoor composting on a large scale
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Other councils collect garden + kitchen waste together

  1. composting in large containers until meat waste is broken down, process called In-vessel composting
  2. In-vessel composting – forming compost from waste plant material within a large vessel in which conditions of temperature and moisture can be controlled
  3. Composting complete by using windrow process

Advantage

  1. conditions monitored inside containers + correct moisture + temperature maintained
  2. The high temperatures kill pathogens + seeds of weed plants
  3. Other process ➡️ anaerobic digestion ➡️ the breakdown of dead plant and animal material without oxygen
  4. Food waste put into large digesters + air is excluded
  5. Methanogens break down material + release methane – methane collected, used to produce heat – process can’t use wood waste because microorganisms can’t break it down
  6. In all processes, the solid end materials can be used for soil conditioning (gardens, parks etc.)
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References:

  1. "The Gifts from Organic Waste", https://static.wixstatic.com/media/0b6b65_c2ab17fc0e2d46a2a83e41d81979db4f~mv2.jpg/v1/fill/w_749,h_562,al_c,q_90/0b6b65_c2ab17fc0e2d46a2a83e41d81979db4f~mv2.jpg
  2. "Windrow Composting", https://4.imimg.com/data4/KU/TE/GLADMIN-30459837/d1-500x500.jpg
  3. "Pin på Novel", https://i.pinimg.com/originals/cd/65/15/cd6515daaa09ceeb69fa50ceb064133d.jpg

And we're done with this topic! Well Done!

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Drafted by Alyssa (Biology)

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