The use of biosolids/sludge is, in most cases, far safer than the accepted use of chemical inputs that are certified as "organically" safe. There are a number of fearmongers who have made good livings out of scaring people with the threat of monsters growing out of their wastes. Human wastes are no more dangerous than any other monogastric animal's.
Hepatitis virus is a real hazard in handling biosolids. They are also
more than just human excrement. Chemicals are often disposed of by
pouring down the drain. The accumulation of heavy metals such as
copper, zinc and arsenic can be problematic on soils where biosolids
are applied. Composting can chelate metals but can't make them
disappear.
Sure organic meal fertilizers can have junk in them but I think your
generalizations are too broad.
________________________
John Cowan
Verde Valley Agri-Lab
Sedona, Arizona
928-300-8824
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