Different mixtures of olive pomace (OP), olive mill wastewater (OMWW) and olive pruning residues (OPR) were aerobically co-composted under natural conditions. Compost temperature showed a sharp increase in the first 40-60 days, followed by a stabilization at 60°C and a decline after 150 days, whereas compost water content ranged from 50-55% to 25-30%. Total and selec-tive microbial counts were followed throughout the experiment by means of innovative (IMT) and conventional (CMT) microbiological techniques. Pseudomonas spp., anaerobic bacteria, actino-mycetes, and fungi reached levels of 8, 7, 5 and 6 log CFU g–1 compost, respectively, with a slight depression after 30-80 days. Total and fecal coliforms strongly decreased during the com-posting process. The use of IMT allowed to de-tect a higher and more stable growth of micro-organisms if compared to CMT. IMT was dem-onstrated to be an appropriate and reliable method for monitoring the microbial pools dur-ing the co-composting process.
Niaounakis, M. and Halvadakis, C.P. (2006) Olive processing waste Management: Literature Review and Patent Survey, second edition. Elsevier Ltd., Kidlington, Oxford, UK.
Alburquerque, J.A., Gonzálvez, J., García, D. and Cegarra, J. (2004) Agrochemical characterisation of “Alpe-rujo”, a solid by-product of the two-phase centrifugation method for olive oil extraction. Bioresource Technology, 91, 195-200.
Hachicha, S., Sallemi, F., Medhioub, K., Ha-chicha, R. and Ammar, E. (2008) Quality assessment of com-posts prepared with olive mill wastewater and agricultural wastes. Waste Management, 28, 2593-2603.
Sellami, F., Jarboui, R., Hachicha, S., Medhioub, K. and Ammar, E. (2008) Co-composting of oil exhausted olive-cake, poultry manure and industrial residues of agro-food activity for soil amend-ment. Bioresource Technology, 99, 1177-1188.
Benitez, J., Beltran-Heredia, J., Torregrosa, J., Acero, J.L. and Cercas, V. (1997) Aerobic degradation of olive mill wastewaters. Appied Microbiology and Biotechnology, 47, 185-188.
Vitolo, S., Petrarca, L. and Bresci, B. (1996) Treatment of olive oil indus-try wastes. Bioresource Technology, 67, 129-137
Beccari, M., Carucci, G., Lanz, A.M., Majone, M. and Petrangeli Papini, M. (2002) Removal of molecular weight fractions of COD and phenolic compounds in an integrated treatment of olive oil mill effluents. Biodegradation, 13, 401-410.
Amaral, C., Lu-cas, M.S., Coutinho, J., Crespí, A.L., do Rosário Anjos, M. and Pais, C. (2008) Microbiological and physicochemical charac-terization of olive mill wastewaters from a continuous olive mill in northeastern Portugal. Bioresource Technology, 99, 7215-7223.
Robles, A., Lucas, R., Alvarez de Cienfuegos, G. and Gálvez, A. (2000) Biomass production and detoxifica-tion of wastewaters from the olive oil industry by strains of Penicillium isolated from wastewater disposal ponds. Biore-source Technoogy, 74, 217-221.
Tsioulpas, A., Dimou, D., Iconomou, D. and Aggelis, G. (2002) Phenolic removal in olive oil mill wastewater by strains of Pleurotus spp. in respect to their phenol oxidase laccase activity. Bioresource Technoogy, 84, 251-257.
D’Annibale, A., Ricci, M., Quaratino, D., Federici, F. and Fenice, M. (2004) Panus tigrinus efficiently removes phenols, color and organic load from olive-mill wastewater. Research in Microbiology, 155, 596-603.
Dias, A.A., Bezerra, R.M. and Nazaré Pereira, A. (2004) Activity and elution profile of laccase during bio-logical decolorization and dephenolization of olive mill waste-water. Bioresource Technology, 92, 7-13.
Lanciotti, R., Gianotti, A., Baldi, D., Angrisani, R., Suzzi, G., Mastrocola, D. and Guerzoni, M.E. (2005) Use of Yarrowia lipolytica strains for the treatment of olive mill wastewater. Bioresource Tech-nology, 96, 317-322.
Fadil, K., Chahlaoui, A., Ouahbi, A., Zaid, A. and Borja, R. (2003) Aerobic biodegradation and de-toxification of wastewaters from the olive oil industry. Interna-tional Biodeterioration and Biodegradation, 51, 37-41.
Paredes, C., Bernal, M.P., Cegarra, J. and Roig, A. (2002) Bio-degradation of olive mill wastewater sludge by its co-composting with agricultural wastes. Bioresource Technol-ogy, 85, 1-8.
Paredes, C., Roig, A., Bernal, M.P., Sánchez-Monedero, M.A. and Cegarra, J. (2000) Evolution of organic matter and nitrogen during co-composting of olive mill wastewater with solid organic wastes. Biology and Fertility of Soils, 32, 222-227.
Paredes, C., Bernal, M.P., Roig, A. and Cegarra, J. (2001) Effects of olive mill wastewater addi-tion in composting of agroindustrial and urban wastes. Bio-degradation, 12, 225-234.
Paredes, C., Cegarra, J,, Bernal, M.P. and Roig, A. (2005) Influence of olive mill wastewater in composting and impact of the compost on a swiss chard crop and soil properties. Environment International, 31, 305-312.
Angelidaki, I. and Ahring, B.K. (1997) Codi-gestion of olive oil mill wastewaters with manure, household waste or sewage sludge. Biodegradation, 8, 221-226.
Picci, G. and Nannipieri, P. (2002) Metodi di analisi microbiologica del suolo - Ministero delle Politiche Agricole e Forestali. FrancoAngeli Edizioni, Milan, It-aly.
Hochstrat, R., Wintgens, T., Melin, T. and Jeffrey, P. (2006) Assessing the European wastewater reclamation and reuse potential - a scenario analysis. Desalination, 188, 1-8.
Moreno, B., Garcia-Rodriguez, S., Ca?izares, R., Castro, J. and Benítez, E. (2009) Rainfed olive farming in south-eastern Spain: long-term effect of soil management on biological indicators of soil quality. Agriculture, Ecosystems and Environment, 131, 333-339.
Sofo, A., Palese, A.M., Casacchia, T., Celano, G., Ricciuti, P., Curci, M., Crecchio, C. and Xiloyannis, C. (2010) Genetic, functional, and metabolic responses of soil microbiota in a sustainable olive orchard. Soil Science, 175, 81-88.
Toscano, P., Casacchia, T. and Zaf-fina, F. (2009) Recuperare i reflui oleari per ri-fertilizzare i suoli. Olivo e Olio, 4, 49-53.
Diacono, M. and Monte-murro, F. (2010) Long-term effects of organic amendments on soil fertility. A review. Agronomy for Sustainable Development, 30, 401-422.
Toscano, P., Casacchia, T. and Zaffina, F. (2009) The “in farm” olive mill residual composting for by-products sustainable reuse in the soils organic fertility res-toration. Proceedings of the 18th Symposium of the Interna-tional Scientific Centre Of Fertilizers - More Sustainability in Agriculture: New Fertilizers And Fertilization Management, November 8-12, 2009, Rome, Italy, 116-121.
D’Annibale, A., Giovannozzi Sermanni, G., Federici, F. and Petruccioli, M. (2006) Olive-mill wastewaters: a promising substrate for mi-crobial lipase production. Bioresource Technoogy, 97, 1828-1833.
Papanikolaou, S., Galiotou-Panayotou, M., Fakas, S., Komaitis, M. and Aggelis, G. (2008) Citric acid production by Yarrowia lipolytica cultivated on olive-mill wastewater-based media. Bioresource Technology, 99, 2419-2428.