Table 1
Urban wastewater sludge chemical characterization
Reference
pH
Organic carbon
Total nitrogen
a
NH
4
+
a
NO
3
À
PO
4
3À
Ca
Mg
Na
K
Fe
Tabatabai and Frankeraber [40]
6.9
24.0
2.25
899
163
0.9
9.3
1.1
0.25
0.31
1.95
EPA [41]
>5.5
ND
3.00
ND
ND
1.5
4
0.4
ND
0.3
1.70
Mantovi et al. [33]
7.9
29.6
4.25
0.62
ND
1.8
ND
ND
0.40
0.71
ND
ND
not determined
a
In ppm, the rest is expressed as a percentage of dry matter
Environmental, Economic, and Ethical Assessment of the Treated Wastewater and. . .
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