What Is a Recycling Plant?

More and more people are committed to protecting the environment by properly sorting household waste, helping to boost recycling rates and preserve the planet. However, many citizens still do not know what happens to light packaging, cardboard, or glass once they are placed in separate collection bins—or what role recycling plants play in turning this waste into valuable resources.

Understanding the purpose of these facilities and how they operate is key to increasing recycling rates and moving toward a circular economy model, where materials remain in use for longer and the environmental impact associated with resource consumption is reduced.

What Is a Recycling Plant?

A recycling plant is an industrial facility where waste from households, businesses, or industrial activities is received and processed through a series of steps to sort, treat, and recover materials. The goal is to transform materials such as paper, cardboard, plastic, glass, or organic waste into reusable resources for manufacturing new products.

In practice, these plants make recycling a tangible and measurable process by converting what we throw away into secondary raw materials that re-enter the value chain.

How Are Plastics Recycled?

There are different types of plastic recycling, the two most common being mechanical recycling and chemical recycling.

In mechanical recycling, plastic materials undergo physical processes such as shredding, washing, and extrusion to produce new products. This is the method used in our plant, as it is suitable for homogeneous and relatively clean plastics such as PET bottles, plastic bags, and recyclable plastic packaging.

Chemical recycling, on the other hand, breaks plastics down at the molecular level. This allows more complex or contaminated plastics—those that cannot be mechanically recycled—to be processed.

How Do Recycling Plants Operate?

Recycling plants receive the waste generated by citizens and deposited in the various collection bins throughout the city. Their purpose is to convert cardboard, paper, plastic, glass, and organic matter into resources that can be used to create new products. For this process to be effective, it requires high levels of organization, precision, and speed.

Waste Collection and Transport to the Recycling Plant

Each municipality’s waste collection service is responsible for collecting and transporting the contents of the bins to the recycling plant assigned to that area. To ensure efficiency, waste is transported separately by type:

• Paper and cardboard → blue bin
• Light packaging → yellow bin
• Glass → green bin
• Organic waste → brown bin
• Residual waste → grey bin

Proper sorting at the source reduces contamination and improves the quality of recovered materials.

Waste Sorting and Treatment

Once at the recycling plant, the contents of the trucks are unloaded onto a bulky waste sorting conveyor. A first inspection is carried out to remove oversized items that cannot be processed at the facility.

After passing through a bag-opening machine, the waste undergoes manual and mechanical screening processes that separate materials by fraction and remove contaminants. Depending on the type of plant, this screening may involve magnetic separators (for metals), optical sorting systems (for plastics), and other classification technologies.

Compaction and Material Recovery

Waste that has not been discarded is treated and recycled for use in new products. Organic matter, for example, undergoes a biological composting process and is transformed into natural fertilizer.

Plastic, paper, cardboard, and metal are typically compacted into bales for subsequent reuse. Each material requires specific recycling processes tailored to its properties.

Waste Disposal

Waste that cannot be reused due to its characteristics is sent to an authorized landfill.

What Materials Are Recycled in a Recycling Plant?

Only waste that can be recovered and transformed into new raw materials is processed in recycling plants. These materials must be suitable for industrial recycling processes and meet minimum quality requirements.

The main types of waste recycled include:

Light Packaging

Includes plastic bottles, aluminum cans, plastic bags, beverage cartons, plastic film, and aluminum foil. These materials undergo specific sorting and separation processes to recover their components.

Paper and Cardboard

Includes cereal boxes, biscuit boxes, shoe boxes, magazines, newspapers, notebooks, office paper, and wrapping paper. After sorting, paper and cardboard are compacted and prepared for conversion into new recycled paper products.

Glass

Bottles, jars, and glass containers are among the most recyclable materials, as glass can be recycled multiple times without losing its properties.

Organic Waste

Includes food scraps and garden waste from households and large producers. These materials are processed through biological composting and converted into natural fertilizer.

By contrast, non-recyclable waste—such as sanitary products (pads, tampons, diapers, wet wipes, or disposable razors)—cannot be treated at recycling plants and is sent to authorized landfill facilities.

Plastic Waste in Recycling Plants

Unlike other material streams, plastic recycling requires a high degree of precision in identification and separation, as materials with similar appearances may have very different industrial behaviors. For this reason, plastic recycling plants include specialized processing lines designed to maximize material purity.

After automatic bag opening, plastic waste undergoes initial size separation using rotating screens. The materials then pass through optical sorting equipment capable of identifying different polymer types. This technology is essential to ensure that compatible materials are grouped together for appropriate treatment.

The process is completed with manual inspection, where contaminants and non-recyclable plastics are removed. Valid materials are grouped and compacted separately, facilitating traceability and future transformation into new raw materials.

Plastic waste is typically classified into:

• PET (Polyethylene Terephthalate): Beverage bottles and food containers. Often separated by color (clear and colored).
• HDPE (High-Density Polyethylene): Rigid containers such as detergent and cleaning product bottles.
• LDPE (Low-Density Polyethylene): Plastic film, bags, and flexible wrapping.
• PP (Polypropylene): Yogurt cups, trays, bottle caps, and packaging for food or personal care products.
• Mixed plastics: Multi-material packaging or plastics combined with other components such as aluminum, requiring specialized treatment.

Detailed classification is essential to optimize recycling stages and ensure higher-quality recycled plastic.

How Is Plastic Recycled?

Once separated and baled by type, plastic waste undergoes industrial recycling. This process ensures that recovered material meets quality standards for reintroduction into the value chain.

1. Shredding
   Plastic waste is shredded to reduce its size and improve processing efficiency.
2. Washing
   The shredded plastic is washed to remove labels, adhesives, dirt, oils, and other contaminants.
3. Drying and Centrifugation
   Residual moisture is removed to ensure material stability.
4. Homogenization
   The plastic is blended to standardize color, texture, and composition.
5. Extrusion
   The material is melted and processed into continuous filaments under controlled conditions.
6. Pelletizing
   The filaments are cut into small plastic pellets (regranulate), the most widely used format in manufacturing new plastic products.

Advanced Recycling Plants in Europe: Our Role Within GCR Group

The development of next-generation recycling plants is driving the evolution of plastic recycling in Europe. Through advanced optical sorting technologies, intensive washing systems, and specialized processing lines, plants can significantly increase recovery rates and improve recycled material quality, helping meet circular economy targets.

At SINTAC, as part of GCR Group, we actively participate in GCR’s state-of-the-art recycling plant—one of the most advanced plastic recycling facilities in Europe. Equipped with cutting-edge technologies such as EREMA processing lines, advanced TOMRA optical sorting systems, and one of the largest hot-wash capacities in Europe, the plant ensures high purity and optimized material quality.

Each year, it processes more than 100,000 tonnes of post-consumer recycled polyolefins and 30,000 tonnes of pre-consumer recycled polyolefins, providing high-quality recycling solutions across multiple industries.

Our involvement in these advanced infrastructures reinforces our commitment to industrial solutions that optimize every stage of the recycling process—from waste recovery to the production of high value-added recycled raw materials—contributing meaningfully to closing production loops within the circular economy.

Frequently Asked Questions

What exactly does a recycling plant do?
It receives waste, sorts it by material, removes contaminants, and prepares recyclable fractions to be transformed into new raw materials.

What happens if we dispose of waste incorrectly?
Contamination levels increase, the quality of recovered materials decreases, and more waste ultimately ends up in landfill.

Do all recycling plants process the same materials?
No. Some plants specialize in specific material streams (plastic, paper-cardboard, glass, or organic waste), while others operate multiple sorting lines.

What is the difference between a general recycling plant and a plastic recycling plant?
A plastic recycling plant incorporates specialized polymer identification processes and optical sorting technologies, preparing materials for recycling by type (such as PET, HDPE, or film).

Conclusion

Recycling plants are essential facilities for transforming waste into resources and advancing toward a circular economy. Through sorting, treatment, and recovery processes, materials such as paper, cardboard, glass, organic matter, and plastic can be reintegrated into industry—reducing the use of virgin raw materials and minimizing environmental impact.

Continuous process improvement and the development of increasingly advanced plastic recycling plants, such as those promoted within GCR Group, reflect the sector’s evolution and the crucial role of innovation in achieving more efficient, higher-quality recycling.