Properties of wet and dry abatement systems for foundries

The applicability of the various abatement systems will be discussed in the following sections of this chapter. 

Investment costs and energy usage for bag filters and wet separators are compared in Table 4.33. 

Abatement technique Investment cost (EUR/Nm ) Energy consumption (kW/1000 Nm ) 

This technique finds general application in European foimdries. 

Dioxins are relevant for thermal processes which have metals present. Dioxins or their precursors may be present in some raw materials and there is a possibihty of de-novo synthesis in furnaces or abatement systems. Dioxins are easily adsorbed onto solid matter and may be collected by all environmental media as dust, scrubber solids and filter dust. Field tests have shown that the formation of dioxins in cupola furnaces cannot be correlated to one (or a few single) operational parameter(s). A combination of measures is needed to minimise the risk of dioxin formation. 

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Table 4.32 Properties of wet and dry abatement systems for foundries [110, Vito, 2001], [155, European IPPC Bureau, 2001], [202, TWG, 2002]...

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