The technology that powers an engine on natural gas is different than that which you would need if you use organic waste as a fuel source. The Europeans (Volvo) have worked on technology to use biomass as a fuel source for trucks. The Chinese currently use this technology. The engines use methanol from biowaste.
There is a company in Europe BioMcn (which is owned by the conglomerate (OCI) which is producing methanol and biomethanol from organic waste. Methanol can be used as a fuel source and can be mixed with gasoline to produce other fuels. They also sell it to industrial methanol users.
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