Imida, an institute in the region of Murcia in SE Spain is currently investigating making biogas from carcasses of and other animal parts discarded from slaughterhouses. Murcia is the right place to do this, as the region produces more than 1,600 tons of unused pork meat and bones waste per month.
Imida liquefies the discarded parts using bacteria present in the meat itself. This meat "juice" then is fermented in tanks and produces about 30 to 40 m3 of biogas per 40,000 liters. If you do the math for the aforementioned 1,600 tons of pork, that's 48,000 to 64,000 m3 of biogas on a monthly basis. Cool and gross.
[Source: Europa Press via Econoticias]