Optibag - Optical sorting system

Optibag is a fully automated optical sorting system for municipal waste. The customers are municipalities, cities, local authorities as well as private contractors within the waste management sector. Users range from households to commercial developments including restaurants and shops.

This is how it works

Users are provided with different coloured waste bags corresponding to the different waste streams that are collected by the municipality. For example, green could be used for food, red for paper and yellow for cardboard packaging. The waste is segregated and put into the bags right where it is produced, for example at home.

The waste bags are placed in the designated chute, bin or container and then collected with a conventional waste truck and transported to the Optibag plant. Upon arrival, the waste bags are dumped into a receiving pit and transferred to a conveyor belt. At this point, no separation of the bags has taken place.

Once on the conveyor belt, the bags are sorted automatically using camera technology that recognises the colour of the bag. When a green bag (for example) is detected a signal is sent from the camera and the bag is pushed off the main conveyor belt, on to a second belt and directed to the appropriate container.

The fully automated optical sorting procedure is managed and supervised by an operator from the plant control room.

The segregated materials are recycled, incinerated to be used for district heating/cooling or processed to biogas and biofertilizers.


Less space is required for waste storage and waste logistics are improved. All waste bags are collected in the same waste chute or bin so there is no need for a special recycling room or house to hold several bins for the different waste streams.

Lorry miles - and therefore carbon emissions - are reduced as a result of collecting every waste stream in one single batch.

More important, given the simplicity of the system, waste segregation is conducted at source and not at a recycling station. Evidence suggests that the easier it is to segregate and dispose off the waste, the more people tend to segregate.

Envac Optibag addresses this and makes waste handling a straightforward process.

Read more about Envac Optibag here.


Case studies Envac Optibag