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composted sewage sludge

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

>Another note on humus, sometimes bags have composted sewage sludge in
>them.  Many organic growers don't like to use any sewage products (like
>the popular Amend product by Kellogg) because it can carry heavy
>metals.  It's personal preference, as I've also heard other people say
>that this isn't true anymore (Roger Swain from the Victory Garden PBS
>show just commented on this subject a few weeks ago - he uses sewage
>products).


At work I often have to look at the chemical analyses of waste products to 
see if they are characterized as hazardous or if they are acceptable at 
municipal waste contained landfills.  Sewage sludge is always analyzed for 
total metals.  Most of the time they are way below the maximum contaminant 
level.  Sewage plants now monitor the amount of pollutants in the waste 
streams from industrial facilities, and this probably cuts down on the 
amounts of metals they receive.  At any rate, compost facilities probably 
sample for metals and other contaminants before they accept sewage sludge 
because they could face huge fines and be closed if they are accepting and 
distributing what is catagorized as hazardous waste.  If in doubt you can 
always ask the company.


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