Meat and fish rendering plants treat by-products that are not suitable for human consumption, thermal process that vary according to the type of row material is the step before the centrifugal separation, decanters are first used to separate the fat from greaves and disc centrifuges, as second step, are used to minimize the impurity quantity.
Processing this kind of by-products, that are controlled by local legislation, still represents a good opportunity to recover profitable value.