Abstract
In the current work, drying characteristics of thickened sludge was investigated with respect to drying conditions in oil vacuum evaporation system. The drying characteristics were confirmed by measuring the amount of condensate with 1-min interval. Results showed that the type of mixing oil changed thermal characteristics. The evaporation rate and drying efficiencies of waste cooking oil showed better results rather than other refined oils. From the TG and DTA test results, the ignition temperature varied depending on oil type. The ignition temperature of drying sludge with refined oil was lower than that with waste cooking oil and raw sludge. The moisture content of dried sludge mixed with oil was less than 3%, however, the sludge dried without any oil showed much higher moisture content of 53.7%. This study showed that sludge-derived fuel from the newly developed oil vacuum drying process can be widely used as a renewable energy source.
Similar content being viewed by others
References
Park KT, Lim BR, Lee SK (2010) Drying characteristics of sewage sludge using vacuum evaporation and frying. J Mater Cycles Waste Manag 12(3):235–239
Ohm TI, Chae JS, Kim JE, Kim H, Moon SH (2009) A study on the dewatering of industrial waste sludge by fry-drying technology. J. Hazard Mater 168(1):445–450
Alvis A, Velez C, Rada-Mendoza M, Villamiel M (2009) Heat transfer coefficient during deep-fat frying. Food Control 20(4):321–325
Chai LH (2007) Statistical dynamic features of sludge drying systems. Int J Thermal Sci 46(8):802–811
Silva DP, Rudolph V, Taranto OP (2005) The drying of sewage sludge by immersion frying. Braz J Chem Eng 22(2):271–276
Garayo J, Moreira R (2002) Vacuum frying of potato chips. J Food Eng 55(2):181–191
Magdziarz A, Wilk M (2013) Thermogravimetric study of biomass, sewage sludge and coal combustion. Energy Convers Manag 75:425–430
Deng WY, Yan JH, Li XD, Zhu XW, Lu SY, Cen KF (2009) Emission characteristics of volatile compounds during sludges drying process. J Hazard Mater 162(1):186–192
Yasuhara A, Amano Y, Shibamoto T (2010) Investigation of the self-heating and spontaneous ignition of refuse-derived fuel(RDF) during storage. Waste Manag 30(7):1161–1164
Murasawa N, Koseki H, Li XR, Iwata Y (2012) Study on thermal behaviour and risk assessment of biomass fuels. Int J Energy Eng 2(5):242–252
Zerlottin M, Refosco D, Della Zassa M, Biasin A, Canu P (2013) Self-heating of dried wastewater sludge. Waste Manag 33(1):129–137
Chen W, Mori S, Pan WP (1996) Studying the mechanisms of ignition of coal particles by TG-DTA. Thermochim Acta 275:149–158
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kim, SH., Lim, BR. & Lee, SK. Drying characteristics of thickened sewage sludge in oil vacuum evaporation system. J Mater Cycles Waste Manag 20, 1085–1089 (2018). https://doi.org/10.1007/s10163-017-0671-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10163-017-0671-8