By Jim Meyer via Grist
Ever wonder about the future of energy? Will it be wind? Solar? Geothermal? No wait, I got it, tar sands! (Let’s try that again — tar sands!) They’ve got everything oil does, but they’re harder to get, crappier when you get them, and leave a much bigger mark on the climate. Sounds like a winner. Let’s look a little closer, shall we?
First off, what are tar sands? Tar sands are deposits of about 90 percent sand or sandstone, water, and clay mixed with only about 10 percent high-sulfur bitumen, a viscous black petroleum sludge rich in hydrocarbons, also known as “natural asphalt.”
The Athabasca reserves, in Alberta, Canada, estimated to hold about 170 billion barrels, are the site of the only commercial tar-sands operation in the world. (Though, spoiler alert, that’s about to change.) It’s one of the largest industrial programs on the planet and could eventually cover an area larger than the state of Florida — and it’s sprouting an enormous oily ganglion known as the Keystone XL pipeline, which, if completed, would pump 1.1 million barrels ofbitumen sludge a day, crisscrossing much of the continent’s freshwater supply, all the way to the Gulf of Mexico.
Sound like a complicated way to create oil, gasoline, and diesel? Naw. Ain’t no thing. Just follow these simple instructions:
1. Change the name from tar sands to oil sands. Even though there’s no actual oil in them, you’re already that much closer to that sweet Texas Tea. I mean, tar is the reason we don’t have mastodons. Nobody wants tar. But everybody wants oil — we put it in our cars and on our salads!
2. Clear-cut all that unsightly boreal forest. This, admittedly, can be a bit of a bear — or, more likely, lots of bears, and lynxes, and trees, and anything else that creeps, crawls, grows, or flies, and, in the name of tar sands, will also need to die.
3. Get yourself some massive excavators, the biggest moveable objects on the planet, each capable of gouging out 16,000 cubic meters of earth an hour, and set about ripping pits into the planet 15 stories deep. Use the excavators to fill enormous dump trucks, 22 feet high and nearly 50 feet long, and capable of hauling 400 tons a load — which is good, because we’re far from done, and it takes a lot of sand to make a little oil.
4. To extract the bitumen from the sands, you’ll need to crush the sands with enormous machines creatively known as crushers. Mix the crushed sands with hot water to form a slurry, then agitate the slurry (interestingly, also a major step in most British cooking) so the bitumen sludge can be scooped out. The stuff is still too thick to transport, though, so you’ll need to cut it with solvents so it can be shipped via pipeline for processing.
5. Now you’re ready to get started! Of course you’ve got a problem. Somebody added solvents to our tar, so here comes the hydro-treating that removes the solvents, along with as much nitrogen, sulfur, and other metals as we can get out. The process uses a lot of water and energy in the form of natural gas and oil. (Hey, what are we trying to make again?) Next, heat it again to remove carbon and add hydrogen as part of the upgrading process to make this sludge useful.