Study on Reutilization of Pyrolytic Residues of Oily Sludge

Table 2

Extraction toxicity of heavy metals in pyrolytic residues (mg/L).

Sample	Cr	Hg	Ni	Cu	Zn	Cd	Pb	As
Pyrolytic residues	0.036	0.002	0.031	0.046	0.033	0.001	0.024	0.016
A	15	0.1	3	100	100	1	5	5
B	1.5	0.05	1	0.5	2.0	0.1	1.0	0.5

A: regulation values of “Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity”; B: first-order of “Integrated Wastewater Discharge Standard.”