Table 7.
Chemical elements associations in sludges of the city purification plant, Joint-Stock Company Lisma and technogenic sludges
Object
Sludge 1
Sludge 2
Technogenic sludge
Leading elements and Kc values
>300
300-100
100-30
Bi-Cd
Sn-Ag
Zn-Mo-Hg-W -Cu-Sb
Zn
Cu-Ni-F-Mo
Sn-Pb
Cd
Hg-Mo
Zn-Sn
30-10
10-3
<3
P-Cr-Pb-Ni
As-F-Yb
B-Sr-Be-U
Cr-Cd-W-P
Ag-As-Hg
B-Sn-Sr
Cu-W-Ag
Ni-Pb-Cr-Sr-Bi-B
F-V -Fe-Tl-Ga-P-Be-Co
Zc
2555
1950
810
Note: Sludge 1 - from the city purification plant, Sludge 2 - from the SELZ, SIS-EVS plants; Kc =
real concentration/background concentration in river bottom
sediments;
Zc - combined pollution coefficient equal to Kc sum.
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