Removal of particulate lead from vehicle exhaust gases

2 Removal of particulate lead from vehicle exhaust gases 

A demonstration of the effectiveness of the du Pont trap appears in Fig. 5.9, in which the emissions from cars fitted with a standard exhaust and with the lead trap are compared. High efficiency of particle trapping is achieved, especially for the larger particle sizes (Table 5.10). Work at the Warren Spring Laboratory, England, showed that the lead emitted with standard exhausts and lead traps was respectively 70.0 and 37.5% of the lead input to the engine over a prolonged road test [15]. 

The cost of the lead trap is relatively modest, and re-cycHng of the collected lead is an economic possibility. No country has yet made fitting of the lead trap compulsory. 

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