Select Committee on Environmental Audit Memoranda

Annex 2



    —  Biomass: biogenic matter including energy crops, agricultural and forestry residues and wastes.

    —  Biofuels: any fuel, gas, liquid or solid from biomass.

    —  Biodiesel: liquid fuel from a biomass suitable for use in a diesel engine.

    —  MSW: Municipal Solid Waste, primarily from households.

    —  Commercial and industrial waste: similar to MSW, but from industrial and commercial undertakings and may have different calorific values.

    —  RDF: Refuse Derived Fuels, produced by sorting and drying the combustible fraction from waste.

    —  Organic: based on carbon.

    —  Biogenic: originally formed from living materials.

    —  Biodegradable: organic or biogenic material that will degrade by bacterial or fungal action eg food waste, paper, wood.


    —  Pyrolysis: in this process, the medium (eg organic waste) is heated in the absence of air to produce a mixture of gaseous and liquid fuels and a solid inert residue (mainly carbon).

    —  Gasification: in this process, organic wastes are heated in the presence of air or steam to produce fuel-rich gases. The technology is based on the reforming process to produce town gas from coal often referred to as producer gas.

    —  Advanced fluidised bed combustion: fluidised bed is a type of boiler where air is blown through the bottom of a boiler and through the fuel, so the fuel sits on the compressed air. It helps it burn efficiently.

    —  Moving grate: type of grate, under a boiler.

    —  Anaerobic digestion: using bacteria to break down a substance. Gases are given off and used for fuel.


    —  Mass burn: everything put into a burner over a boiler.

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