Kinetic Study of the Pyrolysis of Sewage Sludge

Abstract

Pyrolysis of sewage sludges has been studied by means of thermogravimetric analysis. Different possible kinetic models of thermal decomposition have been considered using different heating rates. Two types of sludges, non-digested and anaerobically digested, have been pyrolysed. The best model considers three different organic fractions in sludges, each of them associated with a different thermal behaviour. This model shows an increase in the relative amount of the fraction that is decomposed at the highest temperature as a consequence of the process of digestion. © 1997 ISWA

Keywords

Pyrolysis kinetics sewage sludge thermal decomposition thermo gravimetric analysis.

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References

Agrawal, R.K. (1988) Compositional analysis of solid waste and refuse derived fuels by thermogravimetry. In Compositional Analysis by Thermogravimetry , ASTM STP 997.

Caballero, J.A. , Font, R. , Marcilla, A. & Conesa, J.A. (1995) New kinetic model for the thermal decomposition of heterogeneous materials. Industrial Engineering and Chemistry 34(3), 806-812.

Conesa, J.A. , Caballero, J.A. , Marcilla, A. & Font, R. (1995) Analysis of different kinetic models in the dynamic pyrolysis of cellulose. Thermochimica Acta 254, 175-192.

Conesa, J.A. , Font, R. , Marcilla, A. & Garcia, A.N. (1994a) Pyrolysis of polyethylene in a fluidized bed reactor . Energy & Fuels 8, 1238.

Conesa, J.A. , Marcilla, A. & Font, R. (1994b) Kinetic model of the pyrolysis of polyethylene in a fluidized bed reactor. Journal of Analytical and Applied Pyrolysis 30, 101.

Conesa, J.A. , Marcilla, A. & Font, R. (1996a) Gas from the pyrolysis of scrap tyres in a fluidized bed reactor. Energy & Fuels 10( 1 ), 134-140.

Conesa, J.A. , Marcilla, A. , Font, R. & Caballero, J.A. (1996b) Kinetic model for the thermal decomposition of polyethylene. Journal of Analytical and Applied Pyrolysis 30, 101-120.

Igarashi, M. , Hayafune, Y. , Sugamiya, R. , Nakagawa, Y. & Makishima, K. (1984) Pyrolysis of municipal solid waste in Japan. Journal of Energy Resources Technology 20, 322.

Kaminsky, W. (1991) Pyrolyse von Elastomeren und Gummi zur Wertstoffrückgewinnung , Sonderbruck ans Kautschuk und Gummi, Heft 9/91, Stein 846-851.

10.

Kaminsky, W. (1992) Possibilities of limits of pyrolysis, Makro. Chem., Makromol. Symp., 57, 145-160.

11.

Kaminsky, W. & Kummer, A.B. (1989) Fluidized bed pyrolysis of digested sewage sludge , Journal of Analytical and Applied Pyrolysis, 16, 27-35.

12.

Koch, J. & Kaminsky, W. (1993) Pyrolysis of a refinery sewage sludge. Science and Technology 46, 323.

13.

Kuester, J.L. (1980) Fluidized bed pyrolysis to gases containing olefins. Specialist's workshop on fast pyrolysis of biomass. Solar Energy Research Institute.

14.

Himmelblau, D.M. (1968) Process Analysis Statistical Methods, New York: Wiley.

15.

Piskorz, J. , Scott, D.S. & Westerberg, I.B. (1986) Flash pyrolysis of sewage sludge. Industrial Engineering and Chemical Process Research Development 25, 265.

16.

Ruiz, F. , Prats, D. & Rico, C. (1989) Elimination of LAS (linear alkylbenzene sulphonate) during sewage treatment and compostage of sludges and soil amending processes . In Organic Contaminants in Waste Water, Sludge and Sediment ( D. Quaghebeur , Y. Temmerman & D. Agelletti , eds). Brussels, Belgium: 1st Elsevier Applied Science, 124 pp.

17.

Stammbach, M.R. , Kraaz, B. , Hagenbucher, R. & Richarz, W. (1989) Pyrolysis of sewage sludge in a fluidized bed. Energy & Fuels 3, 255.

18.

Urban, D.L. & Antal, M.J. Jr. (1982) Study of the kinetics of sewage sludge pyrolysis using DSC and TGA. Fuel 61, 799-806.

19.

Water Research Centre (1987) Survey of European sludge treatment and disposal practices (CS 9460 SLG. Medmenham, U.K.: A. V. Bowden.