Energy valorization of industrial biomass: Using a batch frying process for sewage sludge

• Published in: Bioresource technology 2009-08, Vol.100 (15), p.3740-3744
• Main Authors: Romdhana, M.H., Hamasaiid, A., Ladevie, B., Lecomte, D.
• Format: Article
• Language: English
• Subjects: Applied sciences; bioenergy; Biological and medical sciences; Biomass; Civil Engineering; Construction durable; cooking fats and oils; drying; Eco-conception; energy valorization; Engineering Sciences; Environment and Society; Environmental Sciences; Exact sciences and technology; Frying; Fundamental and applied biological sciences. Psychology; heat treatment; Hot Temperature; Materials; mathematical models; Mechanics; Pollution; Sewage; Sewage sludge; Thermal drying; Thermics; Wastes; wastewater treatment
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2009.01.043

This paper studies the energy valorization of sewage sludge using a batch fry–drying process. Drying processes was carried out by emerging the cylindrical samples of the sewage sludge in the preheated recycled cooking oil. Experimental frying curves for different conditions were determined. Calorific values for the fried sewage sludge were hence determined to be around 24 MJ kg −1, showing the auto-combustion potential of the fried sludge. A one-dimensional model allowing for the prediction of the water removal during frying was developed. Another water replacement model for oil intake in the fried sewage sludge was also developed. Typical frying curves were obtained and validated against the experimental data.