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  • From: Claude Genest <genest@together.net>
  • To: permaculture@lists.ibiblio.org
  • Subject: [permaculture] Manure answers
  • Date: Wed, 15 Jan 2003 15:43:12 -0500

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."
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