JEP> Vol.5 No.7, May 2014

Experimental Study of the Fry-Drying Phenomena of Organic Wastes in Hot Oil for Waste-Derived Solid Fuel

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ABSTRACT

In sludge treatment, drying sludge using typical technology with high water content to a water content of approximately 10% is always difficult because of adhesive characteristics of sludge in drying. Many methods have been applied, including direct and indirect heat drying, but these approaches of reducing water content to below 40% after drying are very inefficient in energy utilization of drying sludge. In this study, fry-drying technology with a high heat transfer coefficient of approximately 500 W/m2·°C was used to dry swine excreta, sewage and industrial sludge. Also waste oil was used in the fry-drying process, and because the oil’s boiling point is between 240°C and 340°C and the specific heat is approximately 60% of that of water. In the fry-drying system, the sludge is input by molding it into a designated form after heating the waste oil at temperatures between 130°C and 150°C. At these temperatures, the heated oil rapidly evaporates the water contained in the sludge, leaving the oil itself. After approximately 8 - 10 min, the water content of the sludge was less than 10%, and its heating value surpassed 20,000 kJ/kg. Indeed, this makes the organic sludge appropriate for use as a solid fuel. The dried swine excreta, sewage and industrial sludge can be used in an incinerator like low-rank coal or solid fuel.

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Cite this paper

Ohm, T. , Chae, J. and Moon, S. (2014) Experimental Study of the Fry-Drying Phenomena of Organic Wastes in Hot Oil for Waste-Derived Solid Fuel. Journal of Environmental Protection, 5, 637-646. doi: 10.4236/jep.2014.57065.

References

[1] Ohm, T.I., Chae, J.S., Kim, J.E., Kim, H.C. and Moon, S.H. (2008) A Study on Drying Characteristics of Fry-Drying Technology for Industrial Waste Water Sludge. Journal of Korea Society of Waste Management, 25, 225-231.
[2] Ohm, T.I., Chae, J.S., Kim, J.E., Kim, H.K. and Moon, S.H. (2009) A Study on the Dewatering of the Industrial Waste Sludges by Fry-Drying Technology. Journal of Hazardous Materials, 168, 445-450.
http://dx.doi.org/10.1016/j.jhazmat.2009.02.053
[3] Ohm, T.I., Chae, J.S., Im, K.S. and Moon, S.H. (2010) The Evaporative Drying of Sludge by Immersion in Hot Oil: Effects of Oil Type and Temperature. Journal of Hazardous Materials, 178, 483-488.
http://dx.doi.org/10.1016/j.jhazmat.2010.01.107
[4] Sin, M.S., Kim, H.S., Hong, J.E., Jang, D.S. and Ohm, T.I. (2008) A Study on Fry-Drying Technology for Waste Water Sludge Using Waste Oil. Journal of Korean Society of Environmental Engineers, 30, 694-699.
[5] Sin, M.S., Kim, H.S., Jang, D.S. and Ohm, T.I. (2011) Novel Fry-Drying Method for the Treatment of Sewage Sludge. Journal of Material Cycles and Waste Management, 13, 232-239.
http://dx.doi.org/10.1007/s10163-011-0011-3
[6] Peregrina, C., Arlabosse, P., Lecomte, D. and Rudolph, V. (2006) Heat and Mass Transfer during Fry-Drying of Sewage Sludge. Drying Technology, 24,797-818.
http://dx.doi.org/10.1080/07373930600733085
[7] Holman, J.P. (1990) Heat Transfer. 7th Edition, McGraw-Hill, Boston.
[8] Romdhana, M.H., Lecomte, D. and Ladevie, B. (2011) Dimensionless Formulation of Convective Heat Transfer in Fry-Drying of Sewage Sludge. Chemical Engineering Technology, 34, 1847-1853.
[9] Farkas, B.E., Singh, R.P. and Rumsey, T.R. (1996) Modeling Heat and Mass Transfer in Immersion Frying. II, Model Solution and Verification. Journal of Food Engineering, 29, 227-248.
http://dx.doi.org/10.1016/0260-8774(95)00048-8
[10] Farid, M. and Butcher, S. (2003) A Generalized Correlation for Heat and Mass Transfer in Freezing, Drying, Frying, and Freeze Drying. Drying Technology, 21, 231-247.
http://dx.doi.org/10.1081/DRT-120017745
[11] Peregrina, C., Rudolph, V., Lecomte, D. and Arlabosse, P. (2008) Immersion Frying for the Thermal Drying of Sewage Sludge: An Economic Assessment. Journal of Environmental Management, 86, 246-261.
http://dx.doi.org/10.1016/j.jenvman.2006.12.035
[12] Lee, S.J., Chu, C.P., Tan, R.B., Wang, C.H. and Lee, D.J. (2003) Consolidation Dewatering and Centrifugal Sedimentation of Flocculated Activated Sludge. Chemical Engineering Science, 58, 1687-1701.
http://dx.doi.org/10.1016/S0009-2509(03)00020-4

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