Composting process. Stabilization of the organic fraction

In this phase, the most important part of the composting process takes place, which is the biological STABILIZATION of the organic fraction obtained, where the consumption of significant amounts of oxygen is required, under suitable conditions of temperature and humidity.

For this reason, a dynamic composting process has been implemented, which combines the action of periodic turning, with a controlled air supply system and humidity control with an irrigation of the substrate in the phases where it is required.

Starting from minimum working conditions: 14 days of permanence with 14 turns of homogenization (daily turning), other work systems can be established, up to a maximum of: 28 days of permanence with turns of homogenization every two days, depending on the conditions and needs of each moment.

Once the stabilization phase has concluded, with the thermophilic decomposition of most of the biodegradable compounds present, it goes to the maturation phase, where the slow processes of biosynthesis of humic compounds predominate, with much less oxygen requirements , as control of process parameters. This phase is carried out in the maturation warehouse, depositing the product on a continuous base with a carrier belt.

The periodic aeration and mixing turns are carried out by a self-propelled turner, capable of working with plateaus up to 3.50 meters high.

The permanence time and the number of turns of the product in this phase is conditioned by the degree of stabilization achieved in the trench shed. In this way, for a time of permanence of two weeks in trenches, a minimum of 4 weeks in maturation will be required, while for a permanence of four weeks in trenches, only about 10 days of permanence in maturation will be required

In any case, the humification process will continue during the storage of the final compost.

Compost refining and storage plant

Once the maturation phase is finished, the product obtained goes through a final treatment and purification phase (Refine), in which the impurities contained in the composted organic fraction are eliminated.

The process consists of the following phases:

1. Feeding

Carried out by loading with a front shovel in a plate feeder.

2. Tromel screening

Carried out by loading with a front shovel in a plate feeder.

3. Separation on a densimetric table.

Carried out by loading with a front shovel in a plate feeder.

The dense reject, consisting mainly of small glasses, ceramics, stones, bones, etc., is directed to the reject storage shed, while the final compost obtained is also directed to its storage shed and from there to the compost warehouse.

The air necessary for the fluidization of the organic fraction in the densimetric tables is filtered in separate bag filters before being discharged into the warehouse.