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Jan Steinman's avatar

Great article!

I do have a nit to pick: "Only 7% of bio- can be added to regular diesel without risking harm to the engine. Vehicles modified to work on biodiesel alone are few and far between."

The European Union mandated that all over-the-road diesel vehicles be able to run on 100% biodiesel by 1996.

Rather than either give up selling anything into Europe or running parallel production lines, the US auto industry — which had been successfully fighting such a regulation for years — simply caved.

So any over-the-road diesel vehicle manufactured since 1996 should be compatible with 100% biodiesel. I do not know if this includes off-road machinery and farm equipment, but I suspect a similar "trickle down" regulation from Europe made it so. Those sorts of machines tend to have a much longer lifetime than over-road vehicles, though — I burned 100% biodiesel in a 1962 Ford 3000 tractor, with no issues.

This is not rocket science! All you have to do is replace any rubber that contacts fuel with the synthetic rubber Viton™. Yes, this is slightly more expensive, but it requires no changes in assembly lines or procedures.

I made my own biodiesel for several years. It runs well in vehicles prior to 1996, but you eventually have to replace fuel lines, and possibly re-build the expensive high-pressure fuel pump.

This is not to say that I support commercial-level biodiesel use as any sort of "solution" to our energy woes!

But it could be an option for small- to medium-size farms, especially if combined with "straight vegetable oil" (SVO) use of oils that have not been converted to biodiesel. This requires heating the SVO to reduce its viscosity. I converted a step van to run on SVO that I sucked out of the grease bin of various restaurants. (Actually, this is referred to as "waste vegetable oil," or WVO.)

Note that WVO use does not compete with food — it has already been used as food! But no, there is not enough of it to even make a dent in current diesel use.

I did some calculations, and I came up with an ERoEI of about 6:1 for diesel agricultural use — one hectare of oilseed crops could provide mechanical cultivation of six more hectares. This is probably as good or better than the ERoEI of fracked oil production, but of course, it does not include the oil that went into the manufacture of the farm equipment, which would be necessary for a true "emergy" analysis.

Another thing to consider is biogas. It is fairly easy to produce methane on a farm with the help of animal manures. Collecting it in a low-pressure manner using weather balloons is not too difficult. This would be suitable for cooking, heating, and lighting, but not for high-pressure applications such as Haber-Bosch.

Again, I am in no way promoting these techniques as a way to "save civilization," but it may allow small, isolated farming communities to survive or even prosper in the coming energy decline. And it could serve as a couple-decade "bridge" between thousand-acre monoculture crops from GPS-controlled tractors and ox carts — not for everyone, but perhaps for a small fraction of current industrial agriculture.

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Duncan A Turner's avatar

Very interesting read. I have been following the same argument advanced in this article on the Surplus Energy Economics website _ https://surplusenergyeconomics.wordpress.com/

- for about a year now.

Ir is a so-called "wicked" problem with no obvious solutions, and maybe no solution at all, at least in terms of technological or economic solutions.

I think your analysis is "on the money" (to use a hackneyed Americanism).

Maybe that little bit of jargon is about to die a dismal death pretty soon. Because these days "money" is just an abstraction, an illusion - merely a claim upon resources and not a resource in itself.

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