Composting of vegetable waste

Abstract

The effects of the aeration, seeding, and agitation on the composting of vegetable waste were studied in a laboratory-scale reactor. Experimental results showed that the final product at the end of a 4-day composting period met multiple maturity indices suggested by many researchers. The evolution of carbon dioxide during the composting process could be modelled with a modified Gompertz equation that described the bacteria growth successfully. Multivariate regression analysis was used to study the effects of operating parameters on the carbon conversion. The response surface contour plots were constructed using the regression equation for the examination of the dependence of carbon conversion on operating parameters. The maximum carbon conversion of 14.54% was obtained when the percentage of seeding was set at 14.5%, the air suction rate was set at 2.6 L kg^-1 dry-solid min^-1, and the agitator operated half of the time, alternating on and off for every 5 min. Future work will focus on the application of the data and the experience gained in this work to composters of pilot and semi-commercial scales.

Keywords

CO2 evolution Gompertz model multivariate regression composting process optimization vegetable waste wmr 875-6

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References

Alexander, M. (1997) Introduction to Soil Microbiology, 2nd edn. John Wiley and Sons. New York .

APHA (1992) Standard Methods for the Examination of Water and Wastewater, 18th edn. American Public Health Association, Washington, DC .

Chang, J. I. , Tsai, J. J. & Wu, K. H. (2005) Mathematical model for carbon dioxide evolution from the thermophilic composting of synthetic food wastes made of dog food . Waste Management, 25, 1037-1045 .

de Bertoldi, M. , Rutili, A. , Citterio, B. & Civilini, M. (1988) Composting management: a new process control through O2 feedback . Waste Management and Research, 6, 239-259 .

Chefetz, B. , Chen, Y. & Hadar, Y. (1998) In Szmidt, R. A. K. (ed.) Proc. IS Composting and Use Of Composted Materials. ISHS Acta Horticulturae 469. ISHS.

Cho, H. Y. , Yousef, A. E. & Sastry, S. K. (1982) Growth kinetics of Lactobaccillus acidophilus under ohmic heating . Biotechnology and Bioengineering, 49, 334-340 .

Garcia, C. , Hernandez, M. T. , Costa, F. & Ayuso, M. (1992) Evaluation of the maturity of municipal waste compost using simple chemical parameters . Communications in Soil Science and Plant Analysis, 23(13&14), 1501-1512 .

Goldstein, J. (2003) Supermarket chain sets up full-cycle composting program . BioCycle, 44(1), 28-29 .

Gray, K. R. , Sherman, K. & Biddlestone, A. J. (1971) Process Biochemistry, 6(10), 22-28 .

10.

Haug, R. T. (1993) The Practical Handbook of Compost Engineering. Lewis Publishers, Boca Raton, FL .

11.

Huang, J. S. , Wang, C. H. & Jih, C. G. (2000) Empirical model and kinetic behavior of thermophilic composting of vegetable waste . Journal of Environmental Engineering, 1019-1025 .

12.

Hue, N. V. & Liu, J. (1995) Predicting composting stability . Compost Science and Utilisation, 3(2), 8-15 .

13.

Körner, I. , Braukmereier, J. , Herrenklage, J. & Leikam, K. (2003) Investigation and optimization of composting processes-test systems and practical examples . Waste Management, 23, 17-26 .

14.

Lay, J. J. , Li, Y. Y. & Noike, T. (1998) Mathematical model for methane production from landfill bioreactor . Journal of Environmental Engineering ASCE, 124(8), 730-736 .

15.

Lay J. J. (2000) Biohydrogen generation by mesophilic anaerobic fermentation of microcrystalline cellulose . Biotechnology and Bioengineering. 74(4), 280-287 .

16.

Nakasaki, K. , Sasaki, M. , Shoda, M. & Kubota, H. (1985) Change in microbial numbers during thermophilic composting of sewage sludge with reference to CO2 evolution rate . Applied and Environmental Microbiology, 49(1), 37-41 .

17.

Nakasaki, K. , Watanabe, A. , Kitano, M. & Kubota, H. (1992) Effect of seeding on thermophilic composting of tofu refuse . Journal of Environmental Quality, 21, 715-719 .

18.

Nakasaki, K. & Ohtaki, A. (2002) A simple numerical model for predicting organic matter decomposition in a fed-batch composting operation . Journal of Environmental Quality, 31, 997-1003 .

19.

Miller, F. C. (1993) Minimizing odor generation. In Hoitink, H. A. & Keener, H. M. (ed): Science and Engineering of Composting: Design, Environmental, Microbiological and Utilization Aspects, pp. 219-241. Renaissance Publications, Worthington, OH .

20.

Paul, E. A. & Clark F. E. (1996) Soil Microbiology and Biochemistry, 2nd edn. Academic Press. San Diego, CA .

21.

Pesersen, M. (1994) Supermarket composting goes big time . BioCycle, 36(7), 72-74 .

22.

Richard, T. (1996) The Kinetics of Solid-state Aerobic Biodegradation, PhD dissertation. Cornell University, Ithaca, New York.

23.

Rockell, F. (1994) Supermarket stream added to composting mix . BioCycle, 35(10), 10-12 .

24.

Roger, T. H. (1979). Engineering principles of sludge composting . J. WPCF. 51(8).

25.

Vallini, G. & Pera, A. (1989) Green compost production from vegetable waste separately collected in metropolitan garden-produce market . Biological Wastes, 29(1), 33-41 .

26.

Vallini, G. , Pera, A. , Nizzi, E. , Tortorella, L. & Ciurli, A. (1992) Vegetable residues from garden/produce markets as recyclable biomass for high-quality compost production . In: ISHS Acta Horticulturae 302: International Symposium on Compost Recycling of Wastes. Athens, Greece.

27.

Vallini, G. , Pera, A. , Vlidrighi, M. & Cecchi, F. (1993) Process constraints in source-collected vegetable waste composting . Water Science and Technology, 28(2), 229-236 .

28.

Van Roosmalen, G. R. and Van de Langerijt, J. C. (1989) Green waste composting in the Netherlands . Biocycle, 32-35 .

29.

Wen, T. C. , Cheng, S. S. and Lay, J. J. (1994) A kinetic model of a recirculated upflow anaerobic sludge blanket treating phenolic wastewater . Water Environmental Research, 66, 794-799 .

30.

Wu, L. & Ma, L. O. (2001) Effects of sample storage on biosolids compost stability and maturity evaluation . Journal of Environmental Quality, 30, 222-228 .

31.

Zucconi, F. , Pera, A. , Forte, M. & de Bertoldi, M. (1981) Evaluating toxicity of immature compost . Biocycle. 22, 54-57 .

32.

Zucconi, F. , Monaco, A. & Forte, M. (1985) Phytotoxins during the stabilization of organic matter. In: Gasser, J. K. R. (eds): Composting of Agricultural and Other Wastes, pp. 73-85. Elsevier Applied Science Publications, UK .

33.

Zwietering, M. H. , Jongenburger, I. , Rimbouts, F. M. & van’t Riet, K. (1990) Modeling of the bacteria growth curve . Applied Environmental Microbiology, 56(6), 1857-1881 .