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Li, Liang; Diederick, Ryan; Flora, Joseph R.V.; Berge, Nicole D.
Waste management (Elmsford), 11/2013, Letnik: 33, Številka: 11Journal Article
•Hydrothermal carbonization (HTC) is a novel thermal conversion process.•HTC converts food wastes into value-added resources.•Carbonization integrates majority of carbon into solid-phase and results in a hydrochar with high energy density.•Packaging materials imparts greatest influence on solids energy content.•HTC is energetically favorable. Hydrothermal carbonization (HTC) is a thermal conversion technique that converts food wastes and associated packaging materials to a valuable, energy-rich resource. Food waste collected from local restaurants was carbonized over time at different temperatures (225, 250 and 275°C) and solids concentrations to determine how process conditions influence carbonization product properties and composition. Experiments were also conducted to determine the influence of packaging material on food waste carbonization. Results indicate the majority of initial carbon remains integrated within the solid-phase at the solids concentrations and reaction temperatures evaluated. Initial solids concentration influences carbon distribution because of increased compound solubilization, while changes in reaction temperature imparted little change on carbon distribution. The presence of packaging materials significantly influences the energy content of the recovered solids. As the proportion of packaging materials increase, the energy content of recovered solids decreases because of the low energetic retention associated with the packaging materials. HTC results in net positive energy balances at all conditions, except at a 5% (dry wt.) solids concentration. Carbonization of food waste and associated packaging materials also results in net positive balances, but energy needs for solids post-processing are significant. Advantages associated with carbonization are not fully realized when only evaluating process energetics. A more detailed life cycle assessment is needed for a more complete comparison of processes.
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