Environmental Engineering Reference
In-Depth Information
a
b
0.20
μ
m
0.20
μ
m
c
d
0.20
μ
m
0.20
μ
m
e
f
0.40
m
μ
0.20
μ
m
FIGURE 6.1.2
Transmission electron microscopy images: a. synthetic hydroxyapatite, and
hydroxyapatites produced from cattle bone treated at b. 500°C, c. 700°C, d. 900°C, e. 1100°C,
and f. small MgO crysals, hydroxyapatite from cattle bone treated at 1100°C.
a relatively new and very promising technology and economical alternative to con-
ventional site excavation and disposal of contaminated soil in a waste repository.
An examination of natural systems indicates phosphate treatment can be used to
immobilize heavy metal and radionuclide contaminants for thousands to hundreds
of thousands of years. There are inconsistencies in the reported mechanism of metal
sorption and immobilization by phosphates. More work is needed in this area.
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