The influence of the windrow turning frequency on the pro liferation and dispersion of Aspergillus fumigatus (AF) at a classic, open-air windrow composting site was investigated. Independent of the turning frequency, the intially high con centrations of AF (>106 cfu/gDW ) were strongly reduced already after 2 weeks of composting in the center of all exper imental windrows, as well as at the surface of those being turned frequently (daily). Surface AF counts, however, remained elevated (>10 4 cfu/gDW ) for the less frequently (weekly to monthly) turned windrows. Also, in this case, con centrations of AF dispersed in the air were higher. Tempera ture, the main factor for eliminating AF, rose faster, more homogeneously, and reached higher values in the more fre quently (daily and/or weekly) turned composts than in those turned less frequently. Significant differences were seen between daily and weekly turnings of material with high a C/N ratio (40: 1), but not for the more nutrient rich composts (C/N 30:1), where temperatures were generally higher.
Amlinger, F. (1993) BiotonneWien Vienna, Austria: Verlag Anton Schroll & Co p 248
2.
Anonymous (1994) Stand und Entwicklung der Kompostierung in der Schweiz, 1993 (State and development of composting in Switzerland 1993Bern, Switzerland Bundesamt fur Umwelt, Wald und Landschaft p 60.
Beffa, T., Lott Fischer, J., Aragno, M., Selldorf, P., Gandolla, M. & Gumowski, P. (1993) Etude du développement de moisissures potentiellement allergéniques (en particulier Aspergillus fumigatus) au cours du compostage en Suisse (Study about the growth of potenttally allergenic molds (in particular Aspergillus fumigatus) during composting in Switzerland RD/OFEFP/310 92 84 Bern, Switzerland Bundesamt fur Umwelt, Wald und Landschaft.
5.
Beffa, T., Selldorf, P., Gumowski, P., Lott Fischer, J. , Georgen, E., Gandolla, M. & Aragno, M. (1994) Anwesenheit, Verteilung und medizmische Aspekte von Schimmelpilzen (im besonderen von Aspergillus fumvgatus) in verschiedenen Kompostsystemen der Schweiz (Presence, dispersion and medical aspects of molds (especially Aspergillus fumigatus) in different composting systems in Switzerland . In. Stalder, K & Verkoyen, C. (eds.) Gesundheitsnstken bet der Entsorgung kommunaler Abfalle Beitrage zu einem interdisziplinaren SymposiumGottingen, Germany Verlag Die Werkstatt p 173
6.
Beffa, T., Blanc, M. , Lyon, P-F., Vogt, G. , Marchiani, M. , Fischer, J.L. & Aragno, M. (1996a) Isolation of Thermus strains from hot composts (60 to 80°CApplied and Environmental Microbiology62, 1723-1727
7.
Beffa, T., Blanc, M. , Manlley, L. , Lott Fischer, J. , Lyon, P-F. & Aragno, M. ( 1996b) Taxonomic and metabolic microbial diversity during composting In De Bertoldi, M , Sequi, P, Lemmes, B & Papt, T (eds) International symposium the science of compostingGlasgow , UK Blackie Academic & Professional p 149.
8.
Chen, Y. & Inbar, Y. (1993) Chemical and spectroscopical analyses of organic matter transformations during composting in relation to compost maturity In Hoitink, H A J & Keener, H M (eds ) Science and engineering of composting design, environmental, microbiological and utilization aspectsWorthington, OH, USA Renaissance Publications p. 551
9.
De Bertoldi, M. , Rutili. A. , Citterio, B. & Civilmi, M. (1988) Composting management. a new process control trough O2 feedbackWaste Management & Research6, 239-259
10.
De Bertoldi, M. & Zucconi, F. (1987) Composting of organic residues In: Wise, D L (ed) Bioenvironmental Systems, Volume III Boca Raton, FL, USA: CRC Press Inc p. 95
11.
Farrell, J.B. (1993) Fecal pathogen control during composting In. Hoitink, H A. J & Keener, H M (eds ) Science and engineering of composting design, environmental, microbiological and utilization aspectsWorthington, OH, USA Renaissance Publications, p 282
12.
Finstem, M.S. (1992) Composting in the context of municipal solid waste management In. Mitchell, R. (ed ) Environmental MicrobiologyNew York, NY, USA- Wiley-Liss, Inc. p. 355
13.
Finstein, M.S. & Morris, M.L. (1975) Microbiology of municipal solid waste composting . Advances in Applied Microbiology19, 113-151.
14.
Gottltch, E. (1996) Untersuchungen zur Pilzbelastung der Luft an Arbeitsplatzen in Betrieben zur Abfallbehandlung (Investigation about the pollution of air with molds at working places of waste treatment plantsBielefeld, Germany Erich Schmidt Verlag GmbH & Co p 244
15.
Gumowski, P., Dunoyer-Geindre, S., Latgé, J.P., Beffa, T., Aragno, M. , Selldorf, P. & Gandolla, M. (1992) Evaluation of occupational risk factors for the workers in municipal composting facilitiesEuropean Respiratory Journal5, 405-406
16.
Hay, J.C. & Kuchennther, R.D. (1990) Fundamentals and application of windrow compostingJournal of Environmental Engineering116, 746-763
17.
Helm, M. (1995) Prozessfuhrung bei der Kompostierung von organischen Reststoffen aus Haushalten (Process management for the composting of residual organic wastes from householdsDarmstadt, Germany Kuratorium fur Technik und Bauwesen in der Landwirtschaft e V p 185.
18.
Illmer, P. & Schinner, F. (1997) Compost turning- a central factor for a rapid and high-quality degradation in household compostingBioresource Technology59, 157-162
19.
Kampfer, P. & Weissenfels, W.D. (1997) Luftgetragene Mtkroorgamsmen in Abfallbehandlungsanlagen (Airborne microorganisms at waste treatment plantsLieskau, Germany Fachgruppe Umweltmikrobiologie der Veremigung fur Allgememe und Angewandte Mikrobiologie e V p. 152
20.
Keener, H.M. , Elwell, D.L. , Das, K. & Hansen, R.C. (1994) Remix frequency of compost based on moisture control In Proceedmgs of the International ASAE Summer Meetmg, June 19-22, 1994, Kansas City, MI , USA
21.
Kozakiewicz, Z. & Smith, D. (1994) Physiology of Aspergillus In Atkins, T & Sherwood, R F (eds ) Biotechnology Handbooks 7 AspergillusNew York, NY, USA Plenum Press p 23
22.
Lewis, C.W., Anderson, J.G. & Smith, J.E. (1994) Health-related aspects of the Genus Aspergillus In: Smith, J E (ed ) AspergillusNew York, NY, USA: Plenum Press p 219
23.
Michel, E.C. , Jr, Forney, L.J. , Huang, A J -F, Drew, S. , Czuprenskt, M. , Lmdeberg, J.D. & Reddy, C.A. (1996) Effects of turning frequency, leaves to grass mix ratio and windrows vs pile configuration on the composting of yard trimmings . Compost Science and Utilization4, 26-43
24.
Miller, F.C. (1996) Heat evolution during composting of sewage sludge In De Bertoldi, M , Sequi, P, Lemmes, B & Papi, T (eds ) Internauonal symposium the science of compostingGlasgow , UK. Blackie Academic & Professional p 106
25.
Millner, P.D. , Olenchock, S.A. , Epstem, E. , Rylander, R. , Hames, J. , Walker, J.M. , Ooi, B.L. , Home, E. , Maritato, M.C. & Jakobsen, S.T. (1994) Bioaerosols associated with composting facilitiesCompost Science and Utilization2, 6-57
26.
Rylander, R. & Jacobs, R.R. ( 1994) Organic dusts exposure, effects and preventionBoca Raton, FL, USA Lewis Publishers
27.
Samson, R.A. & van Reenen-Hoekstra, E.S. (1988) Introduction to foodbome fungi Baarn, Delft, The Netherlands Centraalbureau voor Schimmelcultures p 56
28.
Stentiford, E.I. (1993) Diversity of composting systems In Hoitink, H. A J. & Keener, H M (eds.) Science and engineering of composting design, environmental , microbiological and utthzatton aspectsWorthmgton, OH, USA Renaissance Publications p 95
29.
Strauch, D. (1996) Occurrence of microorganisms pathogenic for man and animals in source separated biowaste and compost - importance, control, limits, epidemiology. In: De Bertoldi, M. , Sequi, P., Lemmes, B & Papi, T (eds ) Internatvonal symposium the science of compostingGlasgow, UK: Blackie Academic & Professional p 224
30.
Thomé-Kozmiensky, K.J. (1995) Biologische Abfallbehandlung (Biological waste treatmentBerlin, Germany EF-Verlag fur Energie und Umwelttechnik p. 907
31.
Waksman, S.A., Cordon, T.C. & Hulpoi, N. (1939) Influence of temperature upon the microbiological population and decomposition processes in composts of stable manureSoil Science47, 83-113
32.
Wiley, B.B. & Westerberg, S.C. (1969) Survival of human pathogens m composted sewage. Applied Microbiology18, 994-1001.
33.
Zsolnay, A. & Gorhtz, H. (1997) Water extractable organic matter in arable soils effects of drought and long-term fertilization. Soil Biology & Biochemistry29, 1257-1261.
