Abstract
Every year, a large amount of food, including fruits, vegetables, meat, grains, etc., is thrown away for various reasons. There has been a lot of research done recently on food waste recycling technology because of the possibility of utilizing these disposable resources, as well as their high nutritional value for animal feed and the significance of their processing. On the other hand, the significance of waste management has grown daily as a result of restrictions on greenhouse gas emissions, drought, global warming, and other environmental issues. One of the best methods for managing food waste is drying, and the products can be utilized as animal feed. But due to the limitations of the use of electric energy and fossil fuels due to the increasing per capita use of electricity and environmental pollution, attention to other energy sources such as waste heat and renewable energy is of particular importance. This review provides a comprehensive report on the amount of food waste per person per year in different countries. It also explains the results of various research projects about the moisture conditions of food waste. This review provides valuable information about dryer technology used in domestic, semi-industrial, and large-scale applications. Also, different design parameters of food waste dryers have been investigated in further studies. This review provides important information regarding improving new technical approaches for use in food waste dryers. It also provides valuable information to increase the potential of using renewable energy. Next-generation food waste dryers should be widely investigated to offer new solutions by using new mechanisms, renewable energy, and combining different drying methods to optimize drying temperature and time.
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Data Availability
Enquiries about data availability should be directed to the authors.
Abbreviations
- A :
-
Area (m2)
- \(C\) :
-
Annual cost of dryer
- \(D\) :
-
Days when dryers are in use each year
- \({D}_{b}\) :
-
Crop drying time, by batch (days)
- \(DR\) :
-
Drying rate (kg/w)
- \({E}_{o}\) :
-
To overall energy supplied to dryer
- \({E}_{ev}\) :
-
Thermal energy
- \({E}_{T}\) :
-
Total energy consumption (kwh)
- \(EUR\) :
-
Energy utilization ratio (kJ/s)
- \(h\) :
-
Enthalpy (kJ/kg)
- \({h}_{fg}\) :
-
Vaporization latent heat (kJ/kg)
- \(MR\) :
-
Moisture ratio (%)
- \(M\) :
-
Moisture content (% drying weight)
- \(\dot{m}\) :
-
Mass flow rate
- \({M}_{r}\) :
-
Moisture removal rate (kg/h)
- \({M}_{f}\) :
-
Mass of fresh product (kg)
- \({M}_{y}\) :
-
The amount of product dried inside the dryer each year
- \({m}_{c}\) :
-
Total mass of crop taken for drying (kg)
- \(N\) :
-
Project lifetime (years)
- \(Q\) :
-
Heat (J)
- \(r\) :
-
Equivalent radius (m)
- \(T\) :
-
Temperature (\(^\circ {\text{C}})\)
- \(U\) :
-
Overall heat loss (w/m2 °C)
- \({X}_{T}\) :
-
Exergy input to the dryer (w)
- \(Y\) :
-
Annual capacity of energy parameters (kwh/year)
- \(\upeta\) :
-
Efficiency (%)
- \(\varphi\) :
-
Air relative humidity
- \({\psi }_{ex}\) :
-
Exergy efficiency (%)
- \(\omega\) :
-
Humidity ratio (kg waster/kg dry air)
- \(a\) :
-
Air
- \(b\) :
-
Back or biomass
- \(bd\) :
-
Bone dried
- \(dp\) :
-
Dried product
- \(e\) :
-
Equilibrium
- \(evp\) :
-
Evaporation
- \(f\) :
-
Final or fuel
- \(hdb\) :
-
Hybrid dryer body
- \(i\) :
-
Initial
- \(in\) :
-
Inlet
- \(ina\) :
-
Inlet air
- \(o\) :
-
Initial or reference state
- \(out\) :
-
Outlet
- \(outa\) :
-
Outlet air
- \(p\) :
-
Pressure
- \(r\) :
-
Radiation
- \(t\) :
-
Time or top
- \(\Delta t\) :
-
Time changes from t1 to t2
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This study is obtained due to the state financial support of the Russian federation represented by the Government of the Russian Federation, the Ministry of Education and Science of the Russian Federation and the Customer. This work was financially supported by the Government of the Russian Federation through the ITMO Fellowship and Professorship program.
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Deymi-Dashtebayaz, M., Hosseinzadeh, D., Asadi, M. et al. A Comprehensive Review of Food Waste Dryers and Their Energy Supply Methods. Waste Biomass Valor (2024). https://doi.org/10.1007/s12649-023-02397-w
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DOI: https://doi.org/10.1007/s12649-023-02397-w