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Dr.-Ing. Rolf Berghoff, Dr.-Ing. J. G. Kim / ERT-Consulting - page 4 / 9

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(2) Wastes The following wastes may be treated in the ConTherm plant:

    • residues from the waste paper treatment and paper production,

    • waste from the assortment of packaging wastes,

    • light fraction from the mechanical/biological domestic refuse treatment,

    • high caloric industrial wastes,

    • mixture from aforementioned materials.

  • (3)

    Permit of the Plant

Because the coal-fired power stations do not have the special facilities to emission control, which are demanded at a thermal waste treatment plant, the additional emissions, which result from the co- incineration, can only been minimized by excluding contaminated wastes.

To find out the limits and the applicable wastes for this process the approval authority utilized extensive data over the composition of wastes. Thus it was shown for example that the content of mercury was too high in different wastes and would lead to problems (excess of the exhaust limit values). These wastes did not get permission for the ConTherm plant.

3.2 SVZ – Waste-Gasification in SVZ - Sustec Verwertungs-Zentrum(recycling center) Example for “raw material-recycling”

The SVZ-plant for recycling of waste by gasification followed from a coal gasification plant in the eastern part of Germany, which supplied large parts of the former GDR at the time before the reunification with gaseous fuel. The old gasification units are partially still used, partially are units of the newest technology in use. In the year 2002 approx. 300,000 t at solid wastes were treated with 3 different systems of gasifiers and produced approx. 100,000 t of methanol (CH3OH). The methanol is marketed in chemistry and plastic industry at customary prices, where the methanol is used predominantly for the production of new plastics. In August 2004 the price on the world market was about 230. - EUR/t methanol. There is also a surplus of electric energy - also after deduction of the internal consumption. With this system - gasification and methanol production - the organic components of wastes are converted into new raw materials, which can be used without restrictions for different new products. Therefore this procedure is classified - regarding the aforementioned regulations - also as "material- recycling".

The following wastes are treated in the plant:

  • Sewage sludge,

  • Shredder-Light-Fraction,

  • Plastic wastes,

  • Contaminated wood,

  • Electronics wastes,

  • Sorted fractions of domestic refuse (e.g. dirty packaging wastes)

  • Tar sludge,

  • Lacquer and paint remainders,

  • Liquid and pasty industrial wastes (oils, tars, suspensions, solvent mixtures, problematic

waste water).

For the correct operation of the plant the acceptance criteria for the wastes are substantial. The following table shows the pollutant limit values for the acceptance of solid wastes

Limiting values for contaminants

[mg/kg]

arsenic

2,000

lead

100,000

cadmium

50,000

[Table 2] Limiting values

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