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Olive-mill Wastewater Bioremediation: Evolution of a Composting Process and Agronomic Value of the End Product

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The Science of Composting

Abstract

Olive-mill wastewaters (O.M.W.) were composted with wheat straw in a forced aereation static pile (7.5 × 2.5 × 1.8 m). To eliminate most of the liquid component and to degrade lignin, the thermophilic phase was prolonged for 5–6 weeks, adding O.M.W. every three days. At the end of the process, the ratio O.M.W./ solid substrate was about 10 litres per kg of straw. This paper discusses the bioremediation process from the standpoint of ligninolysis, humification, phenol degradation, phytotoxicity and agronomic value. The end product presented a degree of humification of 78%, and a residual lignin content of 30%. Soluble lignin fraction, made evident during the thermophilic phase, decreased during compost maturation. No phenols or phytotoxicity were detected in the end product. Pot and field experiments performed on maize, rye grass and horticultural plants indicated that bioremediated O.M.W. are able to support partially or totally the nutritional needs of cultures, at the same time improving soil properties.

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Marco de Bertoldi Paolo Sequi Bert Lemmes Tiziano Papi

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© 1996 Springer Science+Business Media Dordrecht

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Tomati, U., Galli, E., Pasetti, L., Volterra, E. (1996). Olive-mill Wastewater Bioremediation: Evolution of a Composting Process and Agronomic Value of the End Product. In: de Bertoldi, M., Sequi, P., Lemmes, B., Papi, T. (eds) The Science of Composting. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1569-5_61

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  • DOI: https://doi.org/10.1007/978-94-009-1569-5_61

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-7201-4

  • Online ISBN: 978-94-009-1569-5

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