What, why and how to compost

What is Composting? In short, composting is the decomposition of organic matter. It is a natural process which transforms organic matter back into its original “building blocks”, which allows them to be used again by another organism. These transformations are done by organisms naturally present in the soil: insects, bacteria, fungi, and other micro-organisms. The end result of the compost is a rich, earth-like material which can be used to fertilize the soil.

Why should I participate?

Getting into the habit of composting can be a bit annoying, but it is a small effort compared to its benefits. The organization of the compost aims to be as simple and as easy as possible so that everyone can take part in it.

By composting, we are able to reuse our waste to produce a rich and fertile soil for our plants.

How can I participate?

Easy peasy: if your waste is compostable, just put it in the appropriate bin!

How do I know what goes where?




What you CAN put in the bin

  • Food waste
  • Coffee grounds
  • Tea leaves
  • Napkins
  • Paper

What you CANNOT put in the bin

  • Already rotten or smelly things
  • Animal products
  • Citrus fruits (you can throw these away in the kitchen)
  • Glossy, coloured, or heavily printed paper
  • Soggy or very dirty napkins
  • Napkins with cleaning products

If you are unsure whether something can be put in the compost or not, you can always ask the person in charge of the compost.

Where can I find the bins?


  • Upstairs coffee machine
  • Bar
  • Kitchen
  • Clean Lab


  • Clean Lab
  • Bar
  • Kitchen

Daily tasks

In the morning:

  • The person in charge collects all the waste from the bins
  • They put the green waste on the compost pile and adds the right amount* of brown waste
    *2x the volume of the green waste
    NOTE: If the brown waste from the bins is not sufficient, they can add cardboard, dry leaves, dead plants, or a bale of hay.

In the evening:

  • The person in charge collects all the waste from the bins
  • It can be added to the compost pile, or put aside for the next morning

Bokashi bins:

  • The kitchen staff is okay with transferring their waste to the bokashi themselves on a daily basis
  • When one of the bokashi bins is full, wait at least one week (or more, if possible) before adding to the compost pile
  • Mix the bokashi waste with ashes from the oven (to counteract the acidity)
  • Mix this with two parts brown waste for one part bokashi waste
  • The bokashi is now ready to go into the compost. It is good to add it little by little, while turning* the compost pile(s) to mix it well.
    *The compost should be turned at least once every two weeks, so it should be mixed regularly even if you’re not adding bokashi waste to it.