permaculture

[Marimike6@cs.com]

"Claude, in general you may be right about the inadvisiability of holding 
pigshit in water, but then is that not exactly what you need to do to harness 
methane? If Mr. Cochrane is indeed trying to use the pigshit for biogas, well 
I 
don't know, perhaps a ferrocement tank?"

Mulchpig--  I think you're going to want to install a catchment screen or 
some other method to separate your solids from the urine first. NCSU has some 
tried and proven ideas here...

http://www.cals.ncsu.edu/waste_mgt/smithfield_projects/recycle/recycle.htm

I think this system is brilliant, and a lot of trial & error has gone into 
it.

Much depends on how elaborate you want your system, and how much you can 
afford to put into it. Here's an idea designed for beef cattle feedlots that 
should work well for hogs...

http://www.westbioenergy.org/cattle/execsumm.html

You can't go much cheaper than digging a pit and covering it with membrane. 
With PS (pigshit) a gravity system with conveyor belt would minimize the 
shovel 
work necessary.

M. Elvin