Dow Chemical is recycling plastic the old fashioned way, they are burning it.
The company wrapped up a trial at its Midland, Michigan, headquarters facility where it incinerated 578 lbs of linear low-density polyethylene film waste from its nearby extrusion laboratories. The company was able to recover 96% of the energy from the plastic, an equivalent, it says, of about 11.1 million Btu of natural gas.
Dow is suggesting that incinerating plastic is a viable alternative to the landfill for those plastics that aren’t commercially recycled. It also asserts that waste-to-energy technology is an underused scheme in the U.S. compared to Europe, where the practice is fairly common.
I couldn’t agree more. I grew up in Staten Island where hostility to landfills is pretty well entrenched. For decades, half the borough smelled like sour milk. We are letting a lot of good energy and land go to waste by burying trash.
You may be wondering about greenhouse gas emissions. I asked Dow about that. “Polyethylene and natural gas have similar fuel values and emit a similar amount of CO2 when burned,” I was told.
True? Well, fair enough. I did my own calculations. I came up with 75 kg of carbon dioxide per kilogram of polyethylene burned. The value for natural gas is about 54 kg. That’s a 39% difference. However, the value for polyethylene matches crude oil and middle distillates almost exactly and is less than petroleum coke.
(Granted, this isn’t something I do every day. So my calculation for polyethylene might have erred somewhere.)
Leave a Reply