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Engineering    2018, Vol. 4 Issue (3) : 371 -380
Research |
Comparing End-Use Potential for Industrial Food-Waste Sources
Raymond RedCorn1,2,Samira Fatemi1,2,Abigail S. Engelberth1,2,3()
1. Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907-2093, USA
2. Laboratory of Renewable Resources Engineering, Purdue University, West Lafayette, IN 47907-2022, USA
3. Division of Environmental and Ecological Engineering, Purdue University, West Lafayette, IN 47907-2022, USA

Approximately one quarter of the global edible food supply is wasted. The drivers of food waste can occur at any level between production, harvest, distribution, processing, and the consumer. While the drivers vary globally, the industrialized regions of North America, Europe, and Asia share similar situations; in each of these regions the largest loss of food waste occurs with the consumer, at approximately 51% of total waste generated. As a consequence, handling waste falls on municipal solid waste operations. In the United States, food waste constitutes 15% of the solid waste stream by weight, contributes 3.4 × 107t of carbon dioxide (CO2) equivalent emissions, and costs 1.9 billion USD in disposal fees. The levels of carbon, nutrients, and moisture in food waste make bioprocessing into higher value products an attractive method for mitigation. Opportunities include extraction of nutraceuticals and bioactive compounds, or conversion to a variety of volatile acids—including lactic, acetic, and propionic acids—that can be recovered and sold at a profit. The conversion of waste into volatile acids can be paired with bioenergy production, including hydrogen or biogas. This present review compares the potential for upgrading industrial food waste to either specialty products or methane. Higher value uses of industrial food waste could alleviate approximately 1.9 × 108 t of CO2equivalent emissions. As an example, potato peel could be upgraded to lactic acid via fermentation to recover 5600 million USD per year, or could be converted to methane via anaerobic digestion, resulting in a revenue of 900 million USD per year. The potential value to be recovered is significant, and food-waste valorization will help to close the loop for various food industries.

Keywords Industrial food waste      Food-waste valorization      Value-added recovery     
Corresponding Authors: Abigail S. Engelberth   
Just Accepted Date: 24 May 2018   Issue Date: 06 July 2018
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Raymond RedCorn
Samira Fatemi
Abigail S. Engelberth
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Raymond RedCorn,Samira Fatemi,Abigail S. Engelberth. Comparing End-Use Potential for Industrial Food-Waste Sources[J]. Engineering, 2018, 4(3): 371 -380 .
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