Milton Landfill is situated approximately 1km west of the village of Milton and 3km north of the centre of Cambridge. The landfill comprises an L –shaped plot of land approximately 48.5 hectares in area which is divided up into three phases of development phases I and II are now fully restored phase III is three quarters restored –cell 19B was capped last year, cell 21B is currently operational and cell 21A is under construction.
Developed within a number of disused clay pits excavated during the 1970’s, the site has received waste since the 1980’s. Phase III however has been developed within arable land. The site is located on Cretaceous Gault Clay, which is overlain by river gravel terrace deposits. Geological data suggests that locally, the thickness of the Gault Clay ranges from 10.2m-18.7m and is underlain by cretaceous lower greensand.
Both hazardous and non-hazardous waste where accepted at Milton up to 2004 and only non-hazardous thereafter.
FCC Environment (Waste Recycling Group as they were previously known) took over ownership of the site and land filling activities in 2004.
The waste that is delivered to Milton landfill site comprises of; transfer station waste, household waste, industrial and commercial and soils. The inputs to the site are predominately from transfer station which is delivered by road.
The site accepts approximately 96,000 tonnes of waste per year
Operational hours are 07.00-16.30 Monday to Friday
Front line machinery includes a 55 tonne compactor, 963 tracked loading shovel, a 360 excavator and a 20 tonne dumper, and a tractor with various attachments.
The site employs 5 members of staff
Landfill Gas Generation and Leachate
All landfill sites naturally produce gas as the waste degrades and breakdown. Made up mostly of methane, oxygen and nitrogen, this gas is captured for two reasons;
- It is a valuable scource of green energy and can be used to generate electricity.
- Collecting the gas minimises any odour it may contain. The process of extracting and using the landfill gas as fuel is carried out by Infinis
The landfill gas is extracted from site to a gas utilisation plant on site containing 3 engines producing electricity which is exported to the national grid.
There are also leachate extraction wells across the site which is collected into a 50m3 storage tank. This leachate is then removed by road tanker and taken to a water treatment plant.
The site is filled in cells and are constructed with a fully CQA engineered clay liner and sidewall prior to waste acceptance. Once the cell has been filled to approved levels it is progressively capped using CQA engineered clay overlain by a suitable depth of subsoil prior to restoration.
Phases I and II are now fully restored phase III is three quarters restored, with some areas being re-profiled to ensure good surface water control by the additional of suitable soils.