Plasma Gasification

According to the excellent news source for celebrity gossip, the metro (ottawa edition), Ottawa (the capital city of Canada), is considering a waste-to-energy technology to deal with the MHW (municiple household waste). The technology sounds too good to be true, basically incinerate MHW, (emitting no pollutants into the atmosphere) use the energy produced to make some electricity to run the plant and sell some back to the grid. Check out this article that explains how theoretically this should work and how it's going to save us all. I have yet to find any one in operation in the world and many examples of seriously problematic similar schemes. Some websites point to westinghouse as a leader in this as they have some pretty serious plasma torches already in successful operation in industry, however their website says only "it is widely hoped plasma gasification can be practically applied." Here is a company selling a plasma gasification system that lays out the issue pretty well, and at the end starts talking about 'what ifs' such as "Lets say, however, that the gasification plant doesn't work at all." That doesn't sound like a proven technology that should be employed on a large scale to solve a large problem.
I would love to hear something from someone who knows more about this than me but where does the garbage go then? Assuming conversation of matter, if there are no emissions into the atmosphere and this system gets rid of the mass that used to be garbage where does it go? Don't get me wrong I have high hopes for tech to solve some environmental problems, I just hope that city council has an independent review of this whole idea.