Afvalzorg has formed a partnership with Rock Solid Processing Ltd and Cireco (Scotland) LLP on a project aimed at optimising landfill gas extraction at the Lochhead landfill site in Scotland. The site encompasses various waste management facilities, including a landfill, an anaerobic digestion plant (with a composting facility), a recycling centre, waste transfer operations and a materials recovery facility.
Located in an old quarry near Dunfermline, Lochhead Landfill site has a synthetic bottom liner system. The predominant composition of municipal solid waste at the site was expected to generate significant amounts of landfill gas.The initial phase of the project involved performing a research campaign, using the Afvalzorg multiphase landfill gas model to predict methane generation. We also conducted a methane screening to identify emission hotspots.
To tackle the issue of landfill gas emissions, we applied our expertise and suggested constructing horizontal gas extraction layers between waste layers to improve efficiency and cut landfill emissions. To enhance gas drainage and minimise odour, we used coarse granular waste materials, known as Incinerator Bottom Ash Aggregate (IBAA).
Drawing on our experience in the Netherlands, where we have successfully integrated IBAA into landfill gas management systems and top covers, Afvalzorg is always happy to share its knowledge with other landfill operators.
This project is a prime example of waste recovery and demonstrates the potential for maximising landfill gas recovery while making a substantial contribution to greenhouse gas mitigation efforts. From optimising gas extraction to turning waste into a valuable resource, we have clearly demonstrated the importance of efficient waste and landfill gas management practices.