High-Performance Shredding Solutions

Solid Recovered Fuel (SRF) is playing an increasingly important role in modern waste management and energy recovery.

By processing suitable non-hazardous waste into a controlled fuel specification, SRF production allows energy to be recovered from materials that may otherwise be destined for disposal.

At the heart of an efficient SRF production process is the right shredding technology.

Mach Tech Services provides high-performance Lindner industrial shredders for SRF production, supporting waste management companies, recycling facilities, SRF producers and waste-to-energy operators across the UK and Ireland.

Lindner has more than two decades of experience developing shredding technology for SRF and RDF applications, while Mach Tech has supplied and supported Lindner shredding equipment across the UK and Ireland for many years.

What Is Solid Recovered Fuel?

Solid Recovered Fuel, commonly abbreviated to SRF, is a processed fuel produced from suitable waste materials.

Instead of sending all non-recyclable waste directly to disposal, suitable materials can be processed to recover their energy value.

SRF can be used in energy-intensive industrial applications, including:

• Cement production
• Lime production
• Industrial boilers
• Waste-to-energy facilities
• Co-incineration plants
• Other energy recovery applications

The exact specification of SRF depends on the requirements of the end user and combustion process.

This means that SRF production isn’t simply about shredding waste.

It is about producing a consistent, suitable fuel product.

How Is SRF Produced?

A typical SRF production process can involve several stages.

Depending on the incoming waste and required fuel specification, the process may include:

Waste Reception → Sorting → Pre-Shredding → Separation → Secondary Shredding → Screening → SRF

The precise configuration varies between facilities.

Some operations use a two-stage shredding system, while others may use a one-step shredder depending on the material and required output.

The objective remains the same:

Transform suitable waste into a consistent, high-quality recovered fuel.

SRF vs RDF: What’s the Difference?

The terms SRF and RDF (Refuse Derived Fuel) are often used together, but they aren’t necessarily interchangeable.

RDF – Refuse Derived Fuel

RDF is a broad term for fuel produced by processing waste for energy recovery.

Its characteristics can vary considerably depending on the source material and processing method.

SRF – Solid Recovered Fuel

SRF is generally produced to more controlled specifications.

Factors can include:

• Calorific value
• Moisture content
• Particle size
• Chlorine
• Mercury
• Other contaminants
• Physical composition

The required specification ultimately depends on the end user.

For this reason, SRF shredding equipment needs to be selected around the finished fuel specification, rather than simply the incoming waste.

Why Shredding Is Critical to SRF Production

Shredding is one of the most important stages of the SRF production process.

The shredder needs to take a variable waste stream and produce a material with a much more controlled physical size.

The right shredder can help deliver:

High throughput
Large quantities of waste need to be processed efficiently.

Consistent particle size
The fuel needs to meet the requirements of the downstream process.

Reliable operation
Unplanned downtime can quickly affect production volumes.

Efficient energy use
Energy consumption contributes directly to operating costs.

Controlled operating costs
Wear, maintenance and downtime all influence the cost per tonne of SRF produced.

SRF Shredders for High-Volume Production

Mach Tech supplies a range of Lindner shredders for SRF production, allowing machinery to be selected around the particular stage of the process.

For pre-shredding, the Lindner Jupiter range provides low-speed, high-torque size reduction for difficult incoming materials.

For secondary shredding and granulation, the Lindner Komet range is designed for high-speed processing of pre-shredded material with lower levels of extraneous material.

For one-step processing, the Lindner Polaris is designed specifically around high-throughput processing of untreated municipal, commercial and industrial waste into recovered fuel applications.

This gives Mach Tech the ability to recommend a solution around the customer’s:

Material → Process → Throughput → Output → Fuel Specification

Lindner Jupiter: SRF Pre-Shredding

The Lindner Jupiter is a heavy-duty primary shredder designed for demanding waste streams.

Within an SRF production plant, it can be used as the first stage of a two-stage shredding process.

The objective is to reduce large and difficult incoming material into a more manageable fraction before secondary processing.

This can include untreated:

• Municipal waste
• Commercial waste
• Industrial waste
• Bulky waste
• Mixed waste streams

The pre-shredded material can then move into separation and secondary shredding.

Lindner Komet: High-Performance SRF Shredding

The Lindner Komet is a high-speed single-shaft secondary shredder designed for precision size reduction and high-quality SRF production.

Lindner positions the Komet specifically for 24/7 premium SRF production, with applications including municipal waste, bulky refuse, industrial and commercial waste, textiles and waste paper.

The machine is designed around:

• High throughput
• Precise particle sizing
• Continuous feeding
• Robust construction
• Efficient operation
• Easy maintenance

Lindner’s newer Komet Series 3 also focuses on energy efficiency, productivity and simplified maintenance.

Lindner Polaris: One-Step SRF Production

For some applications, a two-stage process isn’t necessary.

The Lindner Polaris provides a one-step alternative.

It was developed specifically for processing untreated municipal, commercial and industrial waste in a single shredding stage.

Mach Tech has supplied Polaris systems for SRF applications in the UK, including North West Recycling, which became the first UK operator to use Lindner’s Polaris technology. The project was designed around maximising throughput, minimising oversize material and producing material suitable for SRF processing.

This approach can offer potential benefits including:

• High throughput
• Reduced process complexity
• Consistent output
• Lower material handling requirements
• Reduced footprint
• Simplified maintenance

Whether a one-step or two-stage process is appropriate depends on the material and required fuel specification.

Two-Stage SRF Shredding

For many high-volume SRF production facilities, a two-stage shredding system can provide the required combination of throughput and particle-size control.

A typical process is:

Stage 1 – Primary Shredding

Lindner Jupiter

Reduces the incoming waste into a manageable fraction.

↓

Separation

Recoverable materials are removed.

↓

Stage 2 – Secondary Shredding

Lindner Komet

Further reduces the material to the required SRF specification.

↓

Finished SRF

A controlled fuel fraction is produced for energy recovery.

Mach Tech’s existing SRF page identifies this two-stage configuration as a primary approach for processing untreated domestic, industrial and commercial waste for high-volume SRF production.

How Much SRF Can You Produce?

SRF production capacity depends on a wide range of factors.

These include:

• Incoming material
• Waste composition
• Moisture
• Contamination
• Feed size
• Shredder configuration
• Target particle size
• Number of processing stages
• Operating hours
• Downstream equipment

This means it is difficult to provide a meaningful single “tonnes per hour” figure without understanding the application.

Mach Tech takes an application-first approach, assessing the complete process before recommending a machine.

This helps ensure that the shredder isn’t simply powerful enough — it is appropriate for the process as a whole.

The Importance of SRF Particle Size

Particle size is an important consideration in SRF production.

The correct size depends on the end user’s combustion technology and fuel-handling system.

A smaller particle can provide different feeding and combustion characteristics from a larger fraction.

However, producing an unnecessarily fine product can increase:

• Energy consumption
• Wear
• Processing time
• Operating costs

The goal should therefore be to produce the correct particle size, not simply the smallest possible particle.

Producing Consistent SRF

Consistency is one of the major challenges in waste-derived fuel production.

Incoming waste can change considerably from one load to the next.

The material may contain different proportions of:

• Plastics
• Paper
• Cardboard
• Textiles
• Wood
• Organic material
• Packaging
• Inert contamination

The shredding system needs to handle these variations while maintaining a consistent output.

This is where machine design becomes critical.

Lindner’s shredding technology incorporates features designed to maintain high availability and reduce maintenance downtime, supporting continuous processing.

Reducing Downtime in SRF Production

For a high-volume SRF facility, downtime can be expensive.

When the shredder stops, it can affect the entire production chain.

Potential consequences include:

• Lost production
• Idle labour
• Reduced fuel output
• Delayed deliveries
• Disrupted downstream equipment
• Increased operating costs

This makes shredder reliability one of the most important considerations when selecting SRF processing equipment.

Mach Tech provides ongoing engineering support after installation, including routine maintenance, emergency call-outs, repairs, machine health assessments and spare parts supply.

Designed for Maintenance and Reliability

A high-throughput shredder needs to be maintainable as well as powerful.

Lindner has designed its SRF shredding equipment around features intended to reduce maintenance requirements and improve machine availability.

One example is the belt-drive technology used across Lindner’s shredding systems.

The existing Mach Tech SRF information notes that the efficiency of this belt-drive system was validated by the University of Kassel in 2015, with more than 2 million operational hours reported across machines using the Lindner design at the time.

For a production facility operating continuously, engineering details like these can make a significant difference over the machine’s working life.

SRF Production and the Circular Economy

SRF provides a way to recover energy from waste that cannot be economically or technically recycled as a material.

Instead of treating all residual waste as a disposal problem, the waste stream can be separated into:

Recyclable Materials → Material Recycling

and

Non-Recyclable Combustible Materials → SRF → Energy Recovery

This approach can help extract greater value from waste while reducing the amount sent for disposal.

SRF is therefore an important part of modern resource and waste management strategies.

SRF for Cement Kilns and Industrial Energy Recovery

One of the major applications for SRF is the cement industry.

Cement manufacturing requires substantial thermal energy.

Suitable waste-derived fuels can provide an alternative source of energy for industrial processes, including cement kilns and calciners.

For these applications, the fuel needs to meet the requirements of the plant.

This makes consistent SRF production particularly important.

Mach Tech and Lindner have extensive experience in shredding technology for alternative fuel production, with Lindner’s technology recognised through multiple Global CemFuels Awards.

What Makes a Good SRF Shredder?

When comparing SRF shredding equipment, it’s important to look beyond the machine’s headline horsepower.

Key considerations include:

1. Throughput
How many tonnes can the machine process per hour?

2. Output quality
Can it consistently produce the required fuel fraction?

3. Energy efficiency
How much energy is required per tonne?

4. Wear costs
How frequently do cutting components need replacing?

5. Availability
How reliably can the machine operate?

6. Maintenance
How quickly can routine maintenance be completed?

7. Contamination management
How does the machine respond to unwanted material?

8. Technical support
Can experienced engineers respond quickly when support is needed?

These factors ultimately determine the cost per tonne of SRF produced.

Mach Tech Services: SRF Shredding Specialists

Mach Tech Services has been involved in the UK and Ireland’s SRF and RDF production industry for many years.

The existing Mach Tech SRF page states that more than 100 Lindner SRF/RDF shredders were in daily operation across the UK and Ireland and that Mach Tech had supplied equipment into approximately 90% of UK SRF/RDF shredding operations at the time the page was written.

Those figures should be retained as historical claims unless Mach Tech has current internal data to update them.

Our experience covers:

• SRF production
• RDF production
• Alternative fuel processing
• Primary shredding
• Secondary shredding
• One-step shredding
• Two-stage shredding
• Waste-to-energy applications
• Cement kiln fuel preparation

More Than Just Machine Supply

Mach Tech’s role doesn’t end when an SRF shredder is commissioned.

Our engineering team provides ongoing support including:

Installation

Commissioning

Preventative maintenance

Emergency repairs

Machine health assessments

Knife gapping

Wear-part replacement

Precision engineering

Welding and hardfacing

Full shredder rebuilds

Mach Tech also holds more than £1 million of spare and wear parts in stock, helping customers access critical components quickly and minimise unnecessary downtime.

Choosing the Right SRF Shredder

Every SRF production facility is different.

The right solution depends on the complete process.

Before investing in an SRF shredder, consider:

• What waste are you processing?
• What percentage is recoverable?
• What throughput do you require?
• What SRF specification does your customer require?
• What particle size is needed?
• Will you use one-stage or two-stage shredding?
• What downstream equipment is installed?
• How many hours per week will the system operate?
• What maintenance support is available?

Mach Tech can assess your application and recommend the appropriate Lindner shredding technology.

High-Performance SRF Shredding from Lindner

The production of high-quality solid recovered fuel requires reliable, efficient and precisely configured machinery.

From Lindner Jupiter primary shredders through to Lindner Komet secondary shredders and Lindner Polaris one-step systems, Mach Tech can provide shredding technology for different stages of the SRF production process.

Combined with Mach Tech’s installation, engineering, maintenance and parts support, this provides a complete solution for businesses looking to improve their SRF production.

Looking to increase SRF production, improve output quality or reduce your cost per tonne?

Speak to Mach Tech Services today.

📞 01706 838246
✉️ sales@machtechservices.com

Frequently Asked Questions

What is SRF?

SRF stands for Solid Recovered Fuel. It is a processed waste-derived fuel produced to defined specifications for energy recovery and industrial applications.

How is SRF produced?

SRF is produced by processing suitable waste through stages such as sorting, shredding, separation, screening and sometimes additional size reduction. The exact process depends on the feedstock and required fuel specification.

What is an SRF shredder?

An SRF shredder is industrial shredding equipment used to reduce waste to a controlled particle size suitable for solid recovered fuel production.

What is the difference between SRF and RDF?

RDF is a broad term for refuse-derived fuel. SRF is generally produced to more controlled quality specifications, which can include parameters such as calorific value, moisture, chlorine, mercury and particle size.

What materials can be used to produce SRF?

Suitable feedstocks can include commercial waste, industrial waste, municipal waste, plastics, paper, textiles, packaging and other combustible waste materials, subject to the requirements of the intended fuel specification.

What is the best shredder for SRF production?

There is no single machine suitable for every application. Lindner Jupiter, Komet and Polaris shredders can be used at different stages depending on the waste stream, throughput and required output.

Can SRF be used in cement kilns?

Yes. Suitable SRF can be used as an alternative fuel in industrial applications including cement production, subject to the fuel specification and requirements of the individual plant.

What is a two-stage SRF shredding system?

A two-stage system typically uses a primary shredder such as the Lindner Jupiter to reduce incoming waste, followed by a secondary shredder such as the Lindner Komet to produce a more controlled fuel fraction.

What is one-step SRF shredding?

One-step shredding processes suitable waste into the required fuel fraction in a single shredding stage. The Lindner Polaris is specifically designed for this type of high-throughput waste processing.

How important is particle size when producing SRF?

Particle size is critical because the required specification depends on the downstream fuel-handling and combustion process. Producing the correct size rather than simply the smallest possible size can also help control energy and wear costs.

How can I reduce SRF production costs?

Consider the complete cost per tonne, including throughput, energy consumption, wear, labour, maintenance and downtime. A high-throughput, reliable shredder can potentially reduce the overall cost of producing each tonne of SRF.

Does Mach Tech supply SRF shredders in the UK?

Yes. Mach Tech Services supplies Lindner shredding technology for SRF and RDF production throughout the UK and Ireland and provides installation, commissioning, maintenance, repairs, engineering and parts support.