A document handling apparatus for recycling documents includes an authentication unit, a first recycling storage unit, a document cassette, and a controller. The authentication unit is for receiving an input document and classifying the input document as having a class that is one of a plurality of classes. The first recycling storage unit is adapted to store documents belonging to two or more of the plurality of classes. The document cassette is adapted to store received documents. The controller is adapted to direct the input document to one of the document cassette and the first recycling storage unit based on content of the first recycling storage unit and the class of the input document. Related apparatus, systems, techniques, and articles are also described.