Not if it was incinerated. That's definitely where the sludge should have gone, but it's also where paper waste could go. That would also avoid problems with

Not if it was incinerated. That's definitely where the sludge should have gone, but it's also where paper waste could go. That would also avoid problems with greasy pizza boxes, window envelopes, and impossible to remove toner. Landfilling organic material is illegal in Germany (or possibly throughout the EU). That definitely applies to both paper and the sludge from recycling it; it might even apply to the black "residual waste" bin.