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On May 3, 2011 the inoculation of the manure/glycerine mixture happened for all of our digesters. Our original four digesters, Sam, Jake, Dave and Taylor, have now been replenished three times, and the new addition to biodigester family, Haldrew, has received its second filling. We also spent time constructing our next two digesters, which will contain a mixture of 9% and 11% glycerol, respectively, but we’re saving their inoculation for class on Thursday so that their seals can set properly. Ample drying time is crucial to the sealing process—it maintains the anaerobic environment that we need to make biogas. Continue reading →