Re: [compost_tea] Couple Items that may interest

From: <soilfoodweb_at_aol.com>
Date: Thu, 6 Jan 2005 10:43:54 EST

 
 
Hugh sent the following message about anaerobic digestion. The benefits are
only possible if you have a highly uniform set of starting materials through
the whole year.
 
And struvite can be quite toxic when it becomes concentrated.
 
In dairy lagoons, it is the struvite that is usually the problem going out
onto fields - too concentrated. High-quality organic P? Not when it get to
the concentrations typical in anaerobic digestion.
 
Although as you say, more work is needed.
 
Elaine
 
2. Anaerobic Digestion


Other co-products from digesters include fiber, nutrient water, heat,
struvite, and CO2. Fiber can be used for lower-value products such as organic
soil amendments and animal bedding, or for potentially higher-value products
such as a peat moss replacement in potted plant production. Nutrient-rich
water serves as fertilizer since the nutrients are readily available for use by
plants. Struvite is a high-quality, organic phosphorus fertilizer, waste
heat from the electrical generation process can be used to heat water, and CO2
can be "scrubbed" and captured from the biogas. More research is necessary
on all of these co-products to improve the quality and consistency of the
anaerobic digestion products and to develop and capture value-added markets.
Best wishes for the New Year!
Hugh











Received on Thu Jan 06 2005 - 13:22:27 EST

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