Dear Ron
Good to hear from you in the new year. >I think you misunderstood the article. The bag is only for transport and >temporary storage. They take the empty (and some dung) to a biogas producer, >get it filled and go home to cook with it. It is supposed to be about a day's >cookin' worth. I am with David House www.completebiogas.com on this one: it is a portable digester with nothing but gas in it! J He writes, “It's actually a gas bag, not a digester. Even so, it's an excellent innovation, and a worthy addition to the armamentarium, wherever it can serve as a means of transport in connection with a large digester near any large population. And as well, from my point of view, it's also a bit ironic, since the very sturdy bag, selling for ~$US38, could actually be a digester if it had two additional pipes (an inlet and an outlet), and further that since it's about a cubic meter in volume, it would produce about a cubic meter of gas every day, if fed and kept warm.” I think David is working on a bag digester himself. The transport of gas is interesting. If it turned out to be attractive as a cooking fuel (and delivery system) the users would perhaps be convinced to install their own systems. I am not convinced that a minibus would accept the gas ‘package’ without fear or charge. It is a lot lighter than a load of wood and the walking distance might be less. I wonder if a tire on a rim might be as good, and could be pumped by hand. Will a tire hold a useful volume of gas if hand pumped? Regards Crispin
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