Table 4.

Comparison of Flemish and Wallonia guidelines and typical concentrations in bottom ash cf. [62,63].

Parameter	Flanders Criteria (VLAREMA) Total Concentration Limit mg/kg Dry Matter	Wallonia Criteria Total Concentration Limit mg/kg Dry Matter	Bottom Ash Total Typical Concentration mg/kg Dry Matter
Arsenic	250	100	33 ± 17
Cadmium	10	8
Chromium	1250	230	482 ± 73
Copper	375	210	4042 ± 888
Mercury	5	15	3 ± 2
Lead	1250	1150	1899 ± 396
Nickel	250	150	329 ± 69
Zinc	1250	680	5376 ± 782