Table 2: Physical and physicochemical characteristics of sewage sludge compost.

ParametersValue in sewage sludge compost (SSC)Limit values in SSC (according to Italian Legislation Lgs D. 75/2010)

Colour 10YR 3/2
Moisture content (%)44.4≤50.0
Total OM (%)a58.6
Oxidizable OC (%)a29.0≥20.0
C : N ratio10.2≤25.0
CHA/CFA1.96
Total Kjeldahl Nitrogen TKN (%)a2.83
P2O5 (%)a0.91
K2O (%)a0.71
CEC (cmol(+) kg−1)77.0
Pb (%)a6.40140
Cd (%)a0.101.50
Ni (%)a3.20100
Zn (%)a394500
Cu (%)a14.1230
Hg (%)a 0.101.50
Cr+6 (%)a0.100.50

Values on a dry matter basis; data are mean values, .