Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials

Table 1

Physical properties and heavy metal concentration of oily sludge.

Parameters					Values
Oil-soluble component (wt. %)					25.70
Moisture content (%)					54.28
Solid content (%)					20.02
pH					8.24
Heavy metals	Ba	Cu	Zn	Gr	Ni	Pb
Content (mg/L)^a	1.562	0.825	0.670	0.282	0.136	0.333

^aConcentration of heavy metals (mg/L).