Cocott'arium, avec du vieux on fait du n'oeuf




Localisation: Presles (95)

Sector: Fin de vie

Creation date: 2018

Date of analysis: novembre 2020

Project maturity: Under development


Born in 2015 during the Jardin Jardin competition, Cocott’arium is an initiative led by Aurélie Deroo that proposes the implementation of urban henhouses to recover bio-waste. This food waste feeds the hens whose eggs are collected by Cocott’arium users. This virtuous circle of valorization makes it possible to produce food using food waste.

Aurélie is fully committed to its project in January 2017 and inaugurates its first cocott’arium in January 2018.

Translated with (free version)

  • 50 hens
  • 10000 eggs
  • 8 t/year recycled waste
  • 8 t/year composted waste
  • 15m2 (vegetable garden)
  • 10 clients (companies and municipalities)
    of salmon scales thrown away / month
Extension of product lifespan
  • The hens of the cocott’arium are mainly from the laying hen farms. It is the hens that are culled after 18 months, which are saved from the slaughterhouse and continue to lay their eggs peacefully in the cocott’arium. Hens of different breeds are also offered to enhance the diversity and to present hens in the plumage of different colors and the production of eggs in blue, white, brown etc…
  • The food waste used to feed the hens starts a second life by representing 80% of the hens’ feed. It is therefore seen here as a resource.
Responsible consumption:
  • Awareness of food waste: users are led to think about their food waste production. By asking the question of what is thrown away, we come to the point of ask yourself the question of what you eat.
Recycling :
  • The essence of this project lies in the recycling of bio-waste by valorizing it as a nutritive source for laying hens. At this stage 8 tons of waste are recycled per year.

project operation

To listen to Aurélie present the project, you can watch the video at the very bottom of the article!

The Energy Transition Law [1] of 17/08/2015, one of the 6 objectives of which is to halve the volume of waste produced by 2050, concerns all actors in the territory: citizens, companies, public authorities.

What is bio-waste and why sort it?

A bio-waste is a food waste (vegetable peelings…) or a biodegradable natural waste that can be recovered in compost.

In this law, the question of the management of bio-waste is raised. 

These wastes must be separated from the others since their burial and the absence of oxygen is favorable to the phenomenon of fermentation releasing methane. However, the global warming power of methane is 25 times greater than that of CO2. It therefore plays an active role in global warming.

It is therefore becoming urgent to make the most of our bio-waste.

How to recycle bio-waste?

Bio-waste can be recovered by different processes:

  • compost
  • spreading
  • methanization -> biogas production

These reactions have the advantage of allowing the material to return to the ground.

Some key dates in the management of bio-waste?
  • 01/2012: the large producers of waste (120t/1500 L of edible oil per year) undertake to sort bio-waste and recycle it in appropriate channels.
  • 01/2016: volume reduction to 10 t and 60L
  • by 2025: every French person will have to have a solution for sorting food waste at source.

Cocott’arium offers all the services resulting from the establishment and maintenance of a participatory chicken coop, for companies and municipalities:

  • the installation of the henhouse (metal or wooden structure) that can accommodate up to 4 hens.
  • the quarterly delivery of consumables (organic and anti-fungal cereals) and hemp litter and thus biodegradable (adapted to the dimensions of the henhouses)
  • a training on the management of the chicken house for users
  • veterinary service (transport and care)
  • accessories: waste collectors, waterers, feeders, composters, vegetable bins, etc.


Users reduce their food waste by recycling it into feed for laying hens. They recover the fruit of this valorization: free fresh eggs to be recovered throughout the year.

sustainable approach

Sorting bio-waste allows to valorize it as well as possible. Indeed, it is important to separate them from other waste in order to prevent the degradation process occurring during their burial. This reaction leads to the production of methane, a gas that plays a major role in global warming.

Recycling bio-waste thus makes it possible to reduce the production of this greenhouse gas.

According to a recent ADEME study, the average direct cost of raw material losses and wastage is 0.27€/meal. If we add the indirect costs (notably the time and energy consumed to prepare the meals, waste bill), the amount amounts to 0.68€/meal. [2]

Thus, there is a real economic interest in working to reduce food waste and to recover organic waste.

Cocott’arium offers a maintenance service for hen houses in partnership with the service provider Pro-Insert, which promotes sustainable integration into the job market. [3]

The presence of a cocott’arium helps to revitalize the host site and to recreate a social link between the inhabitants of the same neighborhood or the employees of a company.


This model of bio-waste recovery can be adapted for private individuals with an outdoor space.

Currently, two services are offered: food waste collection and egg recovery.

Chicken houses generate a significant amount of waste: litter, droppings and food scraps. Cocott’arium wishes to develop a collaborative vegetable garden service to use the compost produced by the henhouse. For the moment only 15m² of vegetable garden have been installed.

This recovery allows the use of a large quantity of biowaste: a hen can consume up to 400g of waste per day.

The efficiency of this waste recovery makes Cocott’arium’s initiative interesting.

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