[permaculture] Manure answers

Claude Genest genest at together.net
Wed Jan 15 15:43:12 EST 2003


Advantages of anaerobic lagoons:


*	Manure can be handled hydraulically with flushing systems, sewer 
lines, pumps and irrigation systems.
*	The high degree of stabilization reduces odors during land 
application.
*	High nitrogen (N) reduction minimizes the land area required to make 
use of the effluent.
*	Long-term storage is provided at low cost.

Disadvantages of anaerobic lagoons:


*	Public perception may be that a lagoon is an "open container of 
manure."
*	Undesirable odors may be produced during seasonal (spring and fall) 
changes due to "turnover" and spring start-up after the winter period 
of relatively little biological activity. Initial start-up in late 
spring or early summer is preferred.
*	Undesirable odors may drift off premises during atmospheric 
temperature inversions.
*	Undesirable odors may be present during land application by spray 
irrigation.
*	Nutrient availability is limited if manure is used as a fertilizer 
(due to denitrification of N in the lagoon and most phosphorous (P) 
settles to the bottom).
*	Potential cost of removing built-up solids if the lagoon is to be 
closed down and solids have been allowed to accumulate for several 
years without agitation during the annual pump-down. Also, the land 
area required to dispose of accumulated N and especially P may not be 
available nearby.

Best Regards,
Claude William Genest


Green Mountain Permaculture: Solutions, Sustenance, Sustainability

"What Permaculturalists are doing is the most important work being done 
on the planet."
David Suzuki

"The greatest fine art of the future will be the making of a 
comfortable living from a small piece of land."
Abraham Lincoln

"Clever men solve problems, wise men avoid them."
  Albert Einstein
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