Dimmer Landfill Site: Difference between revisions

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The site is underlain by interbedded mudstone and limestone of the Langport Member, which is of late Triassic and early Jurassic age and forms part of what is known as the Blue Lias. Excavations and site investigation at the site suggest that locally this largely comprises low-permeability lithologies.

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==Engineering and Environmental Control==

The landfill is constructed as a Containment Facility, utilizing the underlying clay materials as the principal barrier. The landfill lining system is augmented with a flexible membrane liner of High Density Polyethylene (HDPE) on the base. As the site is a land-raise rather than a landfill, there are no sidewall barriers. In cross-section the site is lense-shaped: the base is an approximate mirror of the upper surface

There is Landfill Gas power generation with electricity export to the National Grid. Installed capacity is 4.51MW. [1]

Viridor have been unable to secure a connection to the local sewerage system, principally due to a lack of local treatment capacity at the receiving Sewage Treatment Works. There is an on-site leachate treatment plant that discharges to a local watercourse. Dry weather flow in the receiving watercourse is low and consequently, the standards required to be achieved to discharge are sometimes difficult to achieve. Viridor have installed tertiary treatment via reedbeds and other growing media in order to permit discharge at time sof dry weather. Occassionally, leachate produced by the site is removed by tanker to appropriately permitted Sewage Treatment Works.

==Other Infrastructure==

Elsewhere within the site complex, Viridor also developed an In-vessel Composting (IVC) facility to deal with some of Somerset County Council's separately collected Green Waste. This facility is no longer in operation and has been converted to be used a Waste Transfer Station.

==Tonnage Handled==