Moisture Effect on Compaction and Permeability in Composts
Publication: Journal of Environmental Engineering
Volume 123, Issue 3
Abstract
The effects of initial moisture content and compressive loads on the compactability and air permeability of two compost mixes, biosolids (primary) + bark + sawdust + recycled compost, and cow manure are described. Biosolids compost in the moisture range of 42–57% was subjected to compressive stresses of 0–43.2 kPa and the degree of compaction and pressure drops in the flow range of 0.05–0.20 m/s were measured. The relationship between air permeability and total air-filled porosity at different moisture levels was described using the Kozeny-Carman flow model. Biosolids showed significant compressive behavior and lower permeabilities with increasing moisture content (42–57%). Cow manure had a high moisture-retaining capacity and the differences in compaction behavior and air permeabilities were small when moisture levels were varied (57–73%). The model described the relationship between air permeability and effective free air space with a high level of accuracy (R2> 0.95) at all moisture levels and compacted state. It was shown that in beds of moisture levels greater than 60% (wet basis), free air space less than 30% can be reached, and fan power requirements can increase greatly with increasing depth.
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References
1.
Bach, P. D., Shoda, M., and Kubota, H.(1984). “Rate of composting of dewatered sewage sludge in continuously mixed isothermal reactor.”J. Fermentation Technol., 62(3), 285–292.
2.
Blake, G. R., and Hartge, K. H. (1986). “Particle density.”Methods of soil analysis, part I. physical and mineralogical methods, Agronomy Ser. 9, Am. Soc. of Agronomy, Madison, Wis., 377–381.
3.
Braunack, M. V. (1978). “Properties of aggregated seedbeds,” PhD thesis, Univ. of Adelaide, Adelaide, Australia.
4.
Chen, S. (1980). “Resistance of sewage fludge compost to airflow,” MS thesis, Rutgers Univ., New Brunswick, N.J.
5.
Cooper, S. C., and Sumner, H. R.(1985). “Airflow resistance of selected biomass materials.”Trans. ASAE, 28(4), 1309–1312.
6.
Davis, P. F., Dexter, A. R., and Tanner, D. W.(1973). “Isotropic compression of hypothetical and synthetic tilths.”J. Terramech., 10(4), 21–34.
7.
Dexter, A. R.(1975). “Uniaxial compression of ideal brittle tilths.”J. Terramech., 12(1), 3–14.
8.
Dexter, A. R. (1988). “Strength of soil aggregates and of aggregate beds.”Impact of water and external forces on soil structure, J. Drescher, R. Horn, and M. de Boodt, eds., CATENA Verlag, Cremlingen-Destedt, Germany.
9.
Dullien, F. A. L. (1992). Porous media: fluid transport and pore structure. Academic Press Inc., San Diego, Calif.
10.
Finstein, M. S., and Miller, F. C. (1985). “Principles of composting leading to maximization of decomposition rate, odor control and cost effectiveness.”Composting of agricultural and other wastes, J. K. R. Gasser, ed., Elsevier Applied Science Publishers Ltd., Barking, U.K.
11.
Goldstein, N., and Steuteville, R.(1993). “Biosolids composting makes healthy progress.”BioCycle, 43(12), 48–57.
12.
Golueke, C. G. (1977). Biological reclamation of solid wastes. Rodale Press, Emmaus, Pa.
13.
Haug, R. T. (1980). Compost engineering, principles and practices. Technomic Publishing Co., Lancaster, Pa.
14.
Higgins, A. J., Chen, S., and Singley, M. E. (1982). “Airflow resistance in sewage sludge composting aeration systems.”Trans. ASAE, 25(4), 1010–1014, 1018.
15.
Hillel, D. (1982). Introduction to soil physics. Academic Press, Inc., San Diego, Calif.
16.
Jeris, J. S., and Regan, R. W. (1973). “Controlling environmental parameters for optimal composting II.”Compost Sci., (Mar.-Apr.), 8–15.
17.
Keener, H. M., Hansen, R. C., and Elwell, D. L. (1993). “Pressure drop through compost: implications for design.”Proc. Int. Summer Meeting of the Am. Soc. of Agric. Engrs., St. Joseph, Mich.
18.
Kuter, G. A., Hoitink, H. A. J., and Rossman, L. A.(1985). “Effect of aeration and temperature on composting municipal sludge in a full scale vessel system.”J. WPCF, 57(4), 309–315.
19.
Morland, L. W., Sawick, A., and Milne, P. C.(1993). “Uni-axial compaction of a granular material.”J. Mech. and Phys. of Solids, 41(11), 1755–1779.
20.
Nakasaki, K., Shoda, M., and Kubota, H.(1985). “Effect of temperature on composting sewage sludge.”Appl. and Envir. Microbiol., 50(6), 1526–1530.
21.
Schulze, K. L. (1961). “Relationship between moisture content and activity of finished compost.”
22.
Shedd, C. K.(1953). “Resistance of grains and seeds to airflow.”Agric. Engr., 34(9), 616–619.
23.
Spink, L. K. (1967). Principles and practice of flow meter engineering, 9th Ed., The Foxboro Co., Foxboro, Mass.
24.
Suler, D. J., and Finstein, M. S.(1977). “Effect of temperature, aeration and moisture content on the CO2 formation in bench scale, continuously thermophilic composting of solid waste.”Appl. and Envir. Microbiol., 32(2), 345–350.
25.
Wall, D. K., and Zeiss, C.(1995). “Municipal landfill biodegradation and settlement.”J. Envir. Engrg., 121(3), 214–223.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 123 • Issue 3 • March 1997
Pages: 275 - 281
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Mar 1, 1997
Published in print: Mar 1997
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