The other week I had the opportunity to weigh the cow dung produced in a single night at my site. It is a major milestone in my planned project of building a biogas digester at my site. It took a while to get to this point but have now finally been able to start work on design. After about 6 bags of this crap we came to a final measurement of about 338 kg. This would put us at about a 17 cubic meter digester tank. My initial calculations of the gas cap required suggest it would weigh over 900 lbs. This greatly destroys the feasibility of my proposed design in that it would have to be manually lifted into place. Even if this were possible I'm not confident in my ability to design a steel vessel with the kind of accurarcy needed for a potentially dangerous piece of equipment. 
Most of the problem surrounding my design came from the choice of a water jacket for the digester. This week I'm going to start doing some markups where I suggest designs without a water jacket, and where I suggest building a series of biogas digesters each with a capacity for 100 kg of loading per day. Hopefully by the end of the month I can have my proposed design complete and start working on fundraising / grant writing.
And Just For Nostalgia...
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