Pretreatment

Waste sorting and classification plant

The process of selecting and classifying the incoming Urban Solid Waste(including gardening and pruning waste) to the complex is carried out in the pre-treatment warehouse, which has three treatment lines, each with a nominal capacity of 30 tons / hour. Each line has the necessary equipment to be able to carry out the classification and selection in the most effective and efficient way.

The main phases of treatment are:

1. Bulky screening

The material supplied by the “panzer” feeders is introduced into a trommel equipped with bag-opening spikes, with a screening hole of Ø 300 mm

2. Glass selection

The smaller material goes through a manual glass selection for recovery.

3. Double screening

After recovery of the glass, the material is introduced into a double-section screening trommel:

A first section, where most of the Organic Fraction present in the Urban Solid Waste is separated. After that, the Organic Fraction goes to the composting process.
A second rectangular mesh section, where the containers that remain in the Urban Solid Waste are separated.

4. Ballistic separation

The separated fraction in the second body of the Double Screen is transported to the ballistic separators, where through the combined action of: plane inclination, vibratory movement, air impulsion and screening mesh, the incoming flow is broken down into three output flows, all of them with a very specific destination.

Light fraction – planar: transported to manual sorting areas.
Heavy fraction – rolling: transported to the polymer and brick optical separation system.
Fraction smaller than Ø70 mm: organic fraction to compost.

5. Optical separation

The heavy-rolling fraction separated in the ballistic equipment is transported to the optical sorting equipment, which, through a combination of optical and pneumatic technologies, decomposes the incoming flow into three output flows:

Brick packaging fraction:transported to the corresponding barn, for packaging.
Rejection fraction: transported to the manual sorting areas.
Polymers fraction: transported to the optical polymer classification equipment, in which the following fractions are separated:
1. PET plastic fraction: transported to the corresponding warehouse, for packaging.
2. PEAD plastic fraction: transported to the corresponding warehouse, for packaging.
3. Plastic fraction Mixture: transported to the manual sorting areas.

From each of these three lines, a series of common fractions are obtained, which are described below:

Bulky rejection: this fraction is subjected to a manual sorting of recoverable materials, generating a rejection that is transported to the rejection warehouse.
Organic fraction: after a series of separations, the material is deposited on a 150 meter long conveyor belt located in an underground gallery, which will lead it to the tripper feeding system in the composting warehouse.
Line rejects – Optical Sep. Double screen: after the manual sorting of these fractions, recovering the materials with a potential for assessment, the system unloads them on the general reject collector belt of the plant.

Description of garden waste treatment and pruning

The vehicles that transport the waste, discharge directly onto a hopper that feeds the shredder. Once shredded, the waste is conveyed by a carrier belt to one of the two existing containers of 100 m3, equipped with a “moving floor” discharge type, being stored in one of them and dosed through the outlet with a smaller fraction of 80 mm, towards the composting area.

Description of the management of primary refusal treatment

From the waste treatment, a general flow of primary rejection is finally obtained, which is directed to the annexed warehouse for compacting, storage and rejection dispatch.