Umbran said:
Quite true. If it works for a broad range of plastics at once. If it requires a large degree of fine tuning, you may need multiple facilities, which would be a large capital outlay.
For now. How might this kind of technology look 30 years from now -- especially with the kind of smart computer-aided technology that is only now starting to really blossom?
Umbran said:
Not quite. The furnace helps to power itself. It even mostly powers itself, but you don't get out more than you put into it. The article says that it's only 85% efficient on the turkey feedstock. You need to come up with that extra 15% somewhere.
The conservation of energy can come from the input of fuel (turkey castings). As I read it, it means that the 85% is the end product while the other 15% was equivalent to the amount that fuelled the process itself. Later in the article it says that the natural gas is used to fuel the process, because it is too difficult to use in other ways.
'Thermal depolymerization, Appel says, has proved to be 85 percent energy efficient for complex feedstocks, such as turkey offal: "That means for every 100 Btus in the feedstock, we use only 15 Btus to run the process." He contends the efficiency is even better for relatively dry raw materials, such as plastics.'
'"Gas is expensive to transport, so we use it on-site in the plant to heat the process," Appel says.'
Umbran said:
In addition, there seems to be a bit of a fib in here that might well keep you from wanting one in your home. They say that nothing hazardous comes out of the process. That is hogwash, especially if you're talking about using your old computers and electronics as feedstock. Those things are loaded with lead, and other heavy metals. Heavy metals are hazardous waste, pretty much however you slice them.
Not that this is an unmanageable or unreasonable risk. But between that and the likely need to grind stuff up to fit it through, you probably dont want it in your basement.
However, a municiple one of these would be a wonderful replacement for landfills...
Very goods points. Maybe this is just the beginning though. I certainly hope so. At the very least, though, such an efficient system run only as a utility (instead of a decentralized model) should still be a heck of a lot cheaper for the consumer since the consumer fuels the production.