On point 1. I agree that municipal sludge need not be nasty. If the waste
stream is properly
designed AND properly used in the way it is designed (i.e., people don't put
their sump oil down the drain). I guess that sewerage systems differ
according to locality, but where I am, the sewers carry household sewage,
and stormwater is handled differently. I think the current system would work
as designed, as far as soil nutrients go, if the sewage wasn't contaminated.
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