Focus on optimizing preparation processes
The material prepping process is the first step, because the quality of the output depends on the quality of the input. One way to facilitate the process is to use a low-speed machine to shred the input. Examples are the Terminator single-shaft shredder and Crambo dual-shaft shredder, both of which are offered in mobile and stationary versions.
The Crambo has proven very effective with severely contaminated organic waste. In its extra-large shredding chamber, two 2.8 m counterrotating toothed drums ensure positive feed. They open up the material to expose foreign items and contraries, but don’t shred them smaller than necessary. This makes these materials much easier to deal with downstream in the treatment process. With the very heterogeneous and packaged material typical of organic input, only the Crambo can greatly reduce oversizes and reliably open packages, greatly facilitating downstream processes.
Another approach is to pre-screen input prior to shredding, to remove contraries like packaging right from the start.