Review of indoor composting devices

1st generation : plastic containers

Issues with airtight containers:

 

- Need to remove a lot of liquid and this 'fertilizer' is not always usefull (in the winter's months).

 

- Boost anaerobic bacteria & fermentation, brings smells...

- Not mycelium friendly.

 

- Loss of space because of the volume taken by water.

- Not able to process all organic waste.

 

- Average look.

natural materials

- Very heavy (10 -12 kg, empty), may crack

 

-Not well ventilated : wood and terracotta can contain liquids = low or no air flow.

 

-Not so compact.

 

- prices 200 - 320 €

Often over technical stuff :

-Motors, heaters = electric consumption, failures prone.

- Need to add micro organisms, hazardous anaerobic process.

-Drying may be useful but spending energy is not necessary... 

bokashi

and mechanical composters

Our proposal:

- Natural materials (zero plastic)

- Maximum air flow

- Simple design and use, compost everything.

Zero plastic first test

 

Materials:

 

hemp felt

beech wood

jute fibers mat 10mm

oak 18mm

cork board 15mm

aluminium 1.2mm

linen thread

 

Zero plastic Prototype

 

Materials:

 

hemp felt

beech wood

jute fibers strap

cork board 15mm

aluminium 1.2mm

beewaxed linen thread

 

Our key arguments :

- Decentralized composting is way simpler than concentrated composting.

 

- When biowaste is already distributed in small amount,

it is not necessary to gather it.

 

- Moving biowaste mostly means displacement of water.

We propose to reduce logistics to the minimum by just letting water evaporate on the spot...

 

 

 

Our key arguments :

- True passive ventilation =

with oxygen intake we can compost

with mycelium + worms + bacteria.

- 1 silo, 2 methods : worm composting or standard composting:

 addition of carbon (wood chips), self-sustained heating phase.  

 

Our key arguments :

 

- Scalable equipment: 

55 cm silo  23 liters = 1-2 person household

75 cm silo 32 liters = 1-3 person household

 

- Versatile collection of looks :

• printed or upcycled PVC cover ( outdoor ).
• printed colored textile (indoor).
• bare metal or natural materials (zero plastic version).

 

European regulation : end of 2023.