The Future of Asbestos Disposal: Thermal Recycling Explained

Adam Fox • 4 September 2024

A groundbreaking solution to a long-standing problem

Asbestos disposal has long been a critical challenge in the realm of hazardous waste management. The presence of asbestos-containing materials, such as asbestos roof sheets, asbestos insulation and asbestos insulating boards, poses significant health risks and environmental concerns. As awareness of these dangers has grown, so too has the urgency to find safe and effective methods for handling and disposing of this harmful substance.


The future of asbestos disposal lies in innovative technologies that aim to address the limitations of traditional methods. This article explores the groundbreaking approach of thermal recycling, explaining its scientific principles and process. It delves into the environmental and economic benefits of this method, offering insights into how it could revolutionise the way we deal with asbestos waste. By examining this cutting-edge technique, we can better understand its potential to transform asbestos management and contribute to a safer, more sustainable future.


Understanding Asbestos and Its Disposal Challenges


Asbestos refers to six naturally occurring fibrous minerals, classified into two families: amphibole and serpentine . These minerals are resistant to heat, fire, and chemical degradation, making them once popular in various industries . However, all types of asbestos are classified as carcinogenic, posing significant health risks.


Chrysotile (white), a serpentine asbestos, has historically accounted for over 95% of all asbestos used worldwide . Amphibole asbestos including Crocidolite (Blue) and Amosite (Brown) asbestos fibres, with its needle-shaped fibres, requires less exposure to cause cancer compared to serpentine asbestos. The disposal of asbestos-containing materials presents a critical challenge, as waste containing more than 0.1% asbestos is classified as hazardous.


Proper handling and disposal of asbestos is crucial to prevent environmental contamination and health risks. Asbestos waste must be double-bagged, clearly labelled, and placed in fully sealed, locked skips. Disposal should occur in landfills with specific permits for asbestos acceptance. However, nationwide, landfill space is dwindling, and the volume of asbestos-containing materials in the EU alone is estimated to exceed 100 million tonnes.


The Science Behind Thermal Recycling


Thermal recycling employs a scientific process called denaturing to transform asbestos-containing materials into inert substances. This method involves the application of heat in a controlled, precise, and scientific manner, leading to chemical and physical transformations of the material. The process destroys the characteristic properties of asbestos, rendering it no longer hazardous.


The thermal recycling process takes place in a specially designed moving hood kiln with a burner system that maintains tight temperature control. The fully enclosed system includes an after-burner and filtration system to remove volatile organic compounds, fumes, and particulate matter from exhaust emissions.


The entire denaturing process takes 24 hours per load, after which the cooled material is crushed to produce recyclable aggregate.

Extensive testing, including polarised light microscopy, scanning electron microscopy, and transmission electron microscopy, has consistently shown that the treated material contains no detectable asbestos. This innovative approach offers a viable alternative to landfill disposal, addressing the growing challenge of managing the estimated 100 million tonnes of asbestos-containing materials in the EU alone.


The Thermal Recycling Process Explained


Thermal recycling is the single biggest breakthrough in the asbestos industry since the prohibition introduced in the UK in November 1999, and offers a groundbreaking solution to asbestos disposal. The process begins with the collection of asbestos-containing materials, primarily asbestos cement sheets containing Chrysotile, from construction sites. These materials are delivered to the treatment plant in specially designed bags for safe handling.


The heart of the process lies in a unique moving hood kiln, specifically designed for this purpose. The kiln system moves over a base loaded with asbestos-containing materials. A burner system applies controlled, intense heat to the materials, initiating the denaturing process. This scientific method changes the essential characteristics of asbestos, transforming it into an inert substance.


The entire denaturing process takes 24 hours per load. Once cooled, the treated material is crushed to produce recyclable aggregate. Extensive testing, including polarised light microscopy and electron microscopy, consistently shows that the treated material contains no detectable asbestos .


Environmental and Economic Benefits


Thermal recycling offers significant environmental and economic advantages over traditional asbestos disposal methods. This innovative process diverts asbestos-containing materials from landfills, addressing a critical sustainability issue. Landfill disposal is not a sustainable solution, as asbestos does not decay or degrade when buried . This approach merely relocates the problem, creating environmental hazards for future generations.


The thermal recycling process transforms asbestos into a new substance called Calmag, which can be used as a cement replacement. This has a twofold benefit: it reduces waste and creates a useful product. By decreasing the need for cement production, which is a significant source of CO2 emissions, thermal recycling helps to offset its own carbon footprint.


Thermal Recycling's plant can process up to 29,500 tonnes of asbestos-containing materials annually . This significant capacity offers a viable solution to the growing challenge of asbestos waste management, particularly for asbestos cement roof sheets, which make up approximately 60% of asbestos sent to landfills .


Conclusion


Thermal recycling has a significant influence on the future of asbestos disposal, offering a groundbreaking solution to a long-standing problem. This innovative process not only transforms hazardous asbestos-containing materials into inert substances but also creates useful products, addressing both environmental and economic concerns. By diverting asbestos waste from landfills and reducing the need for cement production, thermal recycling paves the way for a more sustainable approach to managing this persistent global challenge.


As the world grapples with the estimated 100 million tonnes of asbestos-containing materials in the EU alone, thermal recycling stands out as a promising alternative to traditional disposal methods. Its ability to process large volumes of asbestos waste while producing recyclable aggregate opens up new possibilities for the construction industry and beyond. 


 The adoption of such forward-thinking technologies is key to creating a safer environment and a more circular economy, setting a new standard for hazardous waste management in the years to come.


At Consulo, sustainability is at the core of everything we do. Reach out to us today to discuss your asbestos management needs. We're committed to ensuring that your compliance efforts are as environmentally friendly as possible, minimising your carbon footprint every step of the way.

Contact Now
by Adam Fox 9 April 2025
Asbestos and the Circular Economy: Why It's Time to Stop Burying the Problem Twenty-five years after asbestos was banned in the UK, we’re still digging a hole—literally and metaphorically. Every day, across the country, asbestos waste is double-bagged, labelled, loaded into skips, and driven to landfill, where it will sit indefinitely, taking up valuable space, creating ongoing liability, and adding to our already bloated environmental burden. And yet, 2025 presents a different path. A smarter one. One that replaces disposal with repurposing, and turns a dangerous waste product into a useful, circular resource. The technology exists. So the question we should be asking isn’t “Can we recycle asbestos?” It’s “Why the hell aren’t we doing it already?” Landfill is Failing Us—But We’re Still Relying On It Let’s start with the basics. There are still over 1.5 million buildings in the UK that contain asbestos, most of them now approaching the end of their useful life. As these structures age or undergo refurbishment, the volume of asbestos waste is only going to increase. Right now, we handle that waste the same way we did decades ago: • Identify it • Remove it (usually under fully controlled conditions) • Seal it in heavy-duty plastic • Drive it to landfill • Bury it • Forget about it Except we don’t forget, do we? Because landfill space is running out. Disposal costs are going up. And the environmental cost? We’re only just starting to count it. There’s a Better Way—and It Already Works Here’s what most duty holders don’t realise: We no longer have to bury asbestos. Thanks to recent advances in thermal treatment technology, we now have a method that can safely denature asbestos, breaking down its fibrous structure and rendering it harmless. Companies like Thermal Recycling in the UK are already proving this is not science fiction. They’re using high temperatures to transform asbestos cement products—like corrugated roofing sheets—into an inert ceramic material that’s completely safe. But here's the best bit: That material isn’t just neutral. It’s useful. It can be crushed and graded into aggregate, which can be used in road construction, paving, and concrete mixes. Instead of creating a waste burden for the next generation, we’re creating a valuable, low-carbon building material. Why Aggregate Matters in the Carbon Equation The production of virgin aggregates—through mining and quarrying—is energy-intensive and environmentally damaging. It contributes significantly to CO₂ emissions and destroys natural landscapes. So by replacing some of that demand with recycled aggregate from denatured asbestos, we: • Cut carbon emissions • Reduce dependence on extraction • Shrink the environmental footprint of infrastructure projects • Extend the life of quarries and reduce waste tonnage That’s not just a win for waste management. That’s a win for the entire construction supply chain. And yet most people in the industry don’t even know it’s possible. Why Are We Still Burying What Could Be Reused? As someone who’s worked in asbestos compliance for over 20 years—and now helps business leaders manage risk more intelligently—I’ve seen the same patterns play out time and time again: • “We’ll just do what we’ve always done.” • “This project’s tight on budget—landfill’s cheaper, right?” • “We’re just following the usual route—it’s less risky.” Let’s be honest. That mindset is outdated, short-sighted, and lazy. Cost may always be a factor, but the belief that landfill is “cheaper” needs to be challenged. Once you factor in: • Long-term environmental costs • Reputational risk • Rising disposal fees • And the public pressure for sustainable practices Thermal recycling is already starting to make sense. Especially when the output is something usable, not something buried. Licensed Contractors: You Don’t Get a Free Pass Either This isn’t just about clients or duty holders. Licensed Asbestos Removal Contractors (LARC’s) have a moral obligation here too. And I say that not from a place of opinion—but from first-hand experience, day in and day out for over two decades. Too often, LARCs put profits over progress. They default to landfill because it’s faster, easier to price up, and keeps their margins clean. They know the alternatives exist—but they don’t explore them, let alone offer them to their clients. When you hold a licence from the HSE, you’re not just a business—you’re a guardian of public health. That comes with responsibility. Choosing the most sustainable, forward-thinking disposal route should be part of that. Especially when the technology is available, proven, and legal. It’s time for the industry to stop hiding behind what’s convenient and start leading from the front. A Moral Obligation for Everyone Involved Whether you’re a: • Local authority managing public buildings • Developer under pressure to go green • Commercial landlord looking to reduce liability • Or a licensed contractor with influence over disposal routes —you have a responsibility to look beyond the cheapest or fastest option. If there’s a proven, safe, and more sustainable way to manage asbestos, you have a duty to understand it before choosing to ignore it. Because let’s be honest: “We didn’t know” isn’t going to wash when the public starts asking why we’re still filling landfill sites with a problem we already have the technology to eliminate. So What Can You Do Differently? No one’s asking you to overhaul your entire waste strategy overnight. But you can—and should—start asking better questions: • “Is landfill our only option here?” • “Could this waste stream be recycled instead of buried?” • “What suppliers, contractors, or experts do we know who can help us explore this?” You don’t have to be a global pioneer. But if you’re in a position of responsibility, you should at least be aware that the old way isn’t the only way anymore. Final Thought: The Future Is Circular—Whether You Join In or Not Asbestos will be with us for decades to come. That’s a fact. But how we handle it—and whether we choose to keep repeating the past or do something smarter—is up to us. Thermal recycling and other denaturing technologies offer a rare opportunity to do something that actually moves the industry forward. Not just ticking the compliance box. Not just burying the problem. But solving it—and turning it into something useful in the process. If you’re involved in asbestos management in even the slightest way, ask yourself this: Are you part of the problem, or part of the solution?
by Adam Fox 13 January 2025
Compliance is no longer just about avoiding fines; it’s about creating workplaces where people can thrive.
by Adam Fox 6 December 2024
This is more than a regulatory issue—it’s a moral obligation
by Adam Fox 7 November 2024
Elevating health and safety from a compliance obligation to a strategic business focus offers immense benefits
by Adam Fox 21 August 2024
More companies, sole traders and responsible individuals are now facing hefty fines or even custodial sentences for non-compliance
by Adam Fox 5 August 2024
Can we afford to delay adopting a technology that would help save lives?
Show More