Controlling hazardous and toxic waste from landfill sites

In the UK, the average household will produce more than a tonne of waste every year, equating to a total of 31 million tonnes of rubbish. Much of this refuse will end up in landfill sites.

Considered one of the most efficient systems for waste disposal, there are currently over 500 landfill sites across the UK. However, the locations of many landfills might not be apparent to those living nearby, nor is the potential risk of toxic waste ending up in the ground or water courses.

In 1990, the Environmental Protection Act introduced regulations for licensing the disposal of waste and in 1996, the UK government passed new legislation to impose a tax on certain types of waste. The purpose was to decrease the quantity of rubbish at landfill sites and minimise the impact refuse was having on the environment, including toxic waste.

Controlling hazardous and toxic waste from landfill sites

In the past, landfill sites were not tightly regulated and there was little consideration for how the construction of such sites would affect the surrounding area, or indeed how the release of hazardous and toxic materials might be prevented from entering the ground. Today there are approximately 200,000 former landfill sites across the UK – many of which are now causing issues with exposed plastic and leaking waste as the ground corrodes around them. Much of the issue is due to the original construction methods used and the lack of understanding of the future effects that buried landfill will have on the environment.

As household and commercial disposal has increased, the process of how landfill sites is managed has become extremely thorough with meticulous recordkeeping for the types and quantities of waste being disposed of. Careful consideration has also been applied to preventing hazardous waste and toxins produced by rotting waste from leaching into the ground.

Geomembrane liners for landfills

Key to this prevention is how landfill sites are constructed. For the last 30 years, geomembranes have been used as liners in landfill to help protect the groundwater and surrounding soil. Geomembranes can also be used as caps to cover waste and prevent odour emissions and evaporation of harmful gases into the atmosphere.

Depending on the type of waste, the majority of modern landfills are usually constructed by using a layer of compacted clay of at least one metre thick, which is then lined with a high-density polyethylene geomembrane. Gravel is then layered over the top of this, which helps to catch liquids released by waste as it degrades. An additional geomembrane layer is then placed over the top of the gravel with a further layer of soil on top.

High-density polyethylene geomembranes (HDPE)

Prior to HDPE, PVC was more widely used for lining landfills. However, the chemical resistance qualities, strength, flexibility and weather resistance of HDPE make it an idealmaterial for use in landfill situations. Additionally, it can be easily thermally-welded making seams more resilient than PVC, which has a tendency to peel apart.

As lining technology has developed, single-unit composite liners have become more widespread and advancements in lining methods have seen products with higher performing protection.

One such product being used by groundworks specialist, Scott Parnell, is its gas barrier.  It's a multi-layered, low density polyethylene membrane, with reinforced gridding containing an integral aluminium foil, specifically designed and manufactured to perform as a robust solution to protect from vapours such as methane, carbon dioxide, radon, and VOC/hydrocarbon from leaking into the ground and atmosphere.

Gas barrier can be used in a variety of applications and situations to protect the ground from hazardous, harmful and toxic gases.

The future of landfill

As the population grows and fewer landfill sites become available, there is still much research to be done into how waste disposal will be addressed in the future. One study suggests that landfills could provide the energy of the future and be used for raw materials. Until then, ensuring the environment is protected is the highest priority.

 

About the author: Wendi O'Toole is Head of Operations at Scott Parnell Water Management. A division of Scott Parnell Ltd, it specialises in the supply of stormwater lining solution systems for attenuation, pond lining, and reed beds as well as gas barrier for groundworks and civil engineering customers across the UK. Independently owned and run, Scott Parnell Ltd has five offices across England and Wales with a team of highly experienced staff offering expert advice to customers. Scott Parnell prides itself on its innovative and pioneering approach to delivering high quality products from a variety of manufacturers – not just market leaders.

To speak to one of our specialists at Scott Parnell Water Management, please call 01908 310453.

LATEST NEWS

Scott Parnell achieves gold accreditation with Constructionline
Scott Parnell – the civils and groundworks supplies specialist - has been promoted to Gold Accreditation with Constructionline.

Scott Parnell opens new depot in Leeds
Scott Parnell – the civils and drainage supplies specialist - has announced the opening of its new depot in Leeds.

Scott Parnell supports budding footballer who has sights on Welsh national team
Scott Parnell has agreed to sponsor a budding young professional footballer who has just started a two-year scholarship with Gillingham Football Club.

SOCIAL MEDIA

@ScottParnellUK
Do you always get exactly the right product for your #civilengineering job? To ensure you do call 01376 502676 #MK… https://t.co/IKFKqwTZmh

@ScottParnellUK
Need troughing, earthing or trackside drainage? Check our #rail division - a leading supplier in platform products… https://t.co/WZStTswNau

TESTIMONIALS

"I find Scott Parnell refreshingly different from most other suppliers, they're very reactive and always stride to provide me with a keen price and excellent service. I would recommend to anyone to give them a try - you will...
Dan Westlake - Aden Contracting

"I have been using Scott Parnell for over three years and in that time I have constantly found them to be efficient, proactive and able to provide added value support where required. Requests for quotations are turned around..."
Ian Ford - Volkerfitzpatrick Ltd

"We have traded with Scott Parnell for several years now and, as our business has grown, so have our needs. Scott Parnell have been able to manage this along the way without any trouble. Both communication and pricing have..."
Alan O'Grady - J Coffey Construction Ltd

"I'm confident when I place an enquiry and order with Scott Parnell I will be provided with extremely competitive rates, along with alternative options. The products will then be delivered in time and in full."
Kevin McSkimming - AD Bly Construction

"I have known Dave and Steve for a very long time so when they started this business I was more than pleased to support them. I feel having an independent option is invaluable as they bring different options to the table..."
Tim Scrivens - Coinford Ltd

Scott Parnell have consistently delivered a high quality product in a timely fashion for the Gospel Oak to Barking Enabling works over the last year. With some 10 miles of troughing to be upgraded in a mix of concrete and GRP...
J Murphy & Sons

As a supplier Scott Parnell has been second to none. All deliveries are on time and the turnaround time from order to receipt of goods is minimal, even last minute orders.
Principal Rail Contractor

Scott Parnell's GRP palisade fencing is unlike any other I have come across - it's totally free of metal components, which completely minimises the risk compared to other types of GRP palisade.
Ulana Fries - BCM

BRANCHES

Witham Branch (Head Office)
Unit 1, Swanvale Estate, Colchester Road, Witham, Essex, CM8 3DH Tele: 01376 502676
Click here for a map

Aberdare Branch
Unit 10, Hirwaun Industrial Estate, Aberdare, Wales, CF44 9UP Tele: 01685 708970
Click here for a map

Milton Keynes Branch
Colts Holm Road, Wolverton, Milton Keynes, MK12 5QD Tele: 01908 579766
Click here for a map

Romford Civils and Rail Sales Office
Asheton Farm Business Centre, Stapleford Abbotts,Essex, RM4 1JU Tele: 0208 805 5797
Click here for a map