With the Quebec provincial government aiming to eliminate organic matter from landfill sites, the municipality of Landrienne was searching for a long-term solution to manage the organic waste and generate added value for their region, which also includes the municipalities of Saint-Marc-de-Figuery, of La Corne, and of Saint-Félix-de-Dalquier. The total population for these 4 municipalities, located in Abitibi-Témiscamingue, is 3800 people divided among 1600 homes.
In order to maximize operational efficiency and minimize transportation of collected material, a thermophile composting site was installed in January 2020 in order to process the organic matter coming in from door-to-door collection in the area. The choice of this type of system also allowed for a considerably reduced footprint at the composting site, when compared to an site with windrows. The system is installed in a hangar, thereby protecting it from extreme weather and wild animals.
The particular characteristics of this northern location, in close proximity of wetlands, were also an important consideration in choosing a closed in-vessel BROME composting system. Finishing compost in piles or windrows is not a desirable option in such areas because leachate (a residual liquid containing dissolved or suspended substances that occurs after water passes through matter) must be avoided in order to prevent environmental contamination. Using a closed in-vessel system to compost their organic waste means the time needed to achieve both finished compost and volume reduction is shortened significantly. That is to say, a few weeks rather than months. As a result, compost maturation is accelerated and can be done in storage bags rather than windrows or piles.
Choice of composting equipment and project objectives
The industrial composting system constructed for Landrienne consists of two BROME 632 rotating composters measuring 6ft wide by 32ft long, as well as a conveyor and a mixer for the pre-treatment of the residual organic matter before its introduction into the composters. In this manner, more than 300 tonnes of organic matter produced yearly will be diverted from landfill. By composting, the volume and weight of the organic waste will by reduced by 50%. The result will be about 160,000 kg of finished compost per year, kept in storage bags until it is ready to be used by the municipalities and their residents.
Here is a video about Landrienne’s composting site in which the director general, Mario Tardif, explains the choice of equipment and the site’s daily operation: