It is fairly standard to detoxify certain industrial poisons and it is standard to convert used vegetable and certain other oils into diesel. But what Rossi claimed has not been achieved and certainly, it was never achieved by Rossi, even if a small portion of what he claimed is being done by others now.
Mary - you are totally wrong about this. Bionic GMBH in Germany have cracked the whole rubbish to diesel problem with a plant that can be tuned (and has been) to run on everything from shredded tyres to farm waste to fish-wrappers. It produces clean diesel and other useful oil fractions by microwaving the waste in close proximity to a specially developed Zeolite catalyst. No dioxins, no stack-gases, no dirty water effluent and (typically) only around 2% residual nasties at the end requiring plasma incineration. And very energy efficient. The company has a small plant in Brno currently and is building a bigger one in Austria. The Brno plant (Smeral) was a deal I was involved in a few years back and I know this is 'good kit' and a sound technology - currently hampered only by the low oil price.