Behavior and Distribution of Heavy Metals Including Rare Earth Elements, Thorium, and Uranium in Sludge from Industry Water Treatment Plant and Recovery Method of Metals by Biosurfactants Application
Table 2
Physical-chemical characteristics of original sludge and polluted sludge.
Parameters
Original sludge
Polluted sludge
pH(H2O)
5.78
4.47
pH(KCl)
5.08
4.42
EC, μS·cm−1
360
1926
Moisture content, %
6.10
7.13
Permeability, cm·s−1
1.75 × 10−5
1.72 × 10−5
Organic matter content, %
14.0
14.0
Cation exchange capacity (CEC), cmol·kg−1
33.6
30.5
BET-specific surface area (SSA), m2·g−1 Langmuir-specific surface area (SSA), m2·g−1