Table 1: Chemical composition of aerobic biosolids from the wastewater treatment plant at Aguascalientes city ( ).

ParameterMeanElement (ppm)Mean

pH (water 1 : 5)6.6Zinc972
EC (water 1 : 5) (dS m−1)1.5Boron2
Organic matter (%)35.2Iron8564
Nitrogen (%)4.1Copper272
Phosphorus (%)3.4Lead38
Potassium (%)0.1Arsenic11
Calcium (%)2.7Chromium60
Magnesium (%)0.3Cadmium6
Sulfur (%)1.0Manganese153
Aluminum (%)1.0Chloride832

Electrical conductivity.