Methane from Sewage

In his "Next City" concept in China, William McDonough has proposed a plan in which 25% of the city's cooking will be done with methane derived from sewage (see this BBC News article).

This certainly seems no worse than the age-old practice of using various animals’ dung to fuel cooking fires. Indeed, it seems a brilliant re-use of energy.

And methane derived from manure (of human or animal origin) seems like an obvious source of relatively free energy, since even if unburned it eventually winds up as water and carbon dioxide (itself a greehouse gas) anyway. So why not get some use from it first?

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