Sludge: Types, Uses, Objectives and Methods of Removing Sludge
Treated sludge can be used for agricultural practices in home gardening, forestry, and parks. Unfortunately, sludge from treatment plants contains lower nutrient levels for nitrogen, potassium and phosphorous, than common fertilizers.
It has also been criticized for containing potentially high levels of metals and contaminants. Regardless, common fertilizers also contain varying degrees of metals and other contaminants.