The burning releases mostly carbon dioxide, water vapour and heat. What's left is ten per cent of the original volume in the form of inert ash. People who know have told me that there is no problem vitrifying the now-benign ash and storing it harmlessly. Even fly ash, which is mostly cinders, dust and soot is handled by filters, acid gas scrubbers and electrostatic precipitators. Another expert with years in the field commented that there are clearly good and bad incinerators.
Current regulations are stiffer than they used to be.
What's more, it burns 400 tons a day and will soon be upgraded to burn 500 tons a day. Finally it must be said that there is absolutely no method of waste disposal that promises zero emissions. The fact is though, that incineration emits far less toxic waste than landfill. If we are to make sense we can't continue to be hysterical. The gloomy and alarmed only foster more gloom and alarm and fear while they feed their pet notions about what is good for the environment.