Apple Pomace Energy and Solids Recovery

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Abstract
Apple pomace is an excellent example of a wasted food resource which also causes significant disposal problems. Two unique apple pomace processing systems were found capable of converting this wasted residue into a beneficial resource. The first process anaerobically digested the pomace producing energy as biogas. Bench and pilot scale testing indicated that nearly 80% of the pomace organics could be converted into a substitute natural gas with an energy value of 10–30 per wet metric ton. The second process, called “Biodrying,” combined a high rate composting reactor with a low energy consuming dryer. Operation of a full scale biodrying system achieved wet pomace mass and volume reductions greater than 70% and produced a dried, stable, odorless product in less than 5 days.

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