Characteristics and Applications of Sewage Sludge Biochar Modified by Ferrous Sulfate for Remediating Cr(VI)-Contaminated Soils

Table 2

Physicochemical properties of sewage sludge and CHBC.

Items	Sewage sludge	CHBC
Water content (%)	78.65	—
Organic content (%)	81.34	—
pH	6.31	7.96
Total N (%)	2.72	1.14
Total P (%)	1.81	2.18
BET specific surface area (m^2/g)	—	24.73
Cu (mg/kg)	75.63	75.12
Zn (mg/kg)	56.27	54.32
Pb (mg/kg)	81.32	78.71
Cr (mg/kg)	67.85	68.46
Ni (mg/kg)	73.64	72.17
Cd (mg/kg)	2.32	2.56
Hg (mg/kg)	0.12	0.11
As (mg/kg)	0.78	0.64