Biofuel from Waste Pig Carcasses

by Emil Morhardt

Disposal of waste animal carcasses is expensive, a nuisance, and more trouble than its worth, at least some of the time in China. Consider that in 2013 over 16,000 dead pigs were dumped into one of Shanghai’s primary drinking water sources (Zhang and Ji, 2024). If this waste product were more valuable, than nothing of the sort would happen. According to these authors the carcasses are, in fact, worth $56/tonne, when converted to biofuel. To prove their point, they used pig carcasses to make biodiesel and biogas. They cooked them in water in an autoclave (basically a pressure cooker) for six hours then extracted the pig fat from the water and converted it to biodiesel. The remaining water was inoculated with anaerobic bacteria from a pig farm digester, and allowed to form biogas, in this case 63% methanol. Continue reading