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发表于 2009-6-25 01:07:00
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Earthworms, added to biosolids, break down organic material and produce a fi ne-grained castings, considered by some to have
greater value as a soil amendment than traditional composts. Generally operated in a semi-continuous fl ow. The earthworms stay
in the bed with no need to restock regularly; generally, the worm population is self regulating and will increase to the point where
available food and space constrain further expansion. The process must be monitored for such parameters as moisture content
and temperature but is not labor-intensive. Flow of solids into the system is then adjusted to optimize living conditions for the
worms. The castings are known to contain plant growth regulators and other substances that make them an effective form of biofertilizer
and bio-pest control agent.
A full-scale demonstration in Orange County, Florida, showed greater reduction of indicator pathogens in biosolids composted
with, versus without, the addition of worms. The Manure Management Program, Cornell University, is currently researching
vermicomposting of animal manure. |
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