Applicability of fume collection techniques for quenching baths

Edge extractors are only effective up to a certain size and lose their effectiveness almost completely at the time of the highest emissions, i. e. when a hot workpiece is submerged in the bath. In spite of this, edge extraction is the most sensible capture measure, utilising big baths combined with a blast veil and a roof dome. 

The technique is used in several foundries around Europe. 

The following measures result in a marked reduction in waste water  

Use of dry dedusting systems Dry dedusting systems can be used for most foundry exhaust gas flows. However, in exceptional cases, it may be necessary to use a wet scmbber for removal of iron-containing ultra-fine dust fractions. The applicabilities of dry and wet exhaust cleaning techniques are discussed in Section 4.5 

Biological waste gas scrubbers or compost filters The use of a biological waste gas scrubber can be considered if the gases to be treated contain readily biodegradable substances such as phenols, etc. Biological scrubbers generate less waste water than conventional wet scrubbers because biologically treated waste water can be recirculated more often. 

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Table 4.SS Applicability of fume collection techniques for quenching baths [32, CAEF, 1997]...

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