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Characterization of potential liquid organic fertilizers obtained by alkaline extraction from two-phase olive-mill waste composts

Authors

  • Ghita Ait Baddi,

    Corresponding author
    1. Département des Sciences, Faculté Polydisciplinaire de Taroudant, Université Ibn Zohr, 83000 Taroudant, Morocco
    2. Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura, 30100 Murcia, Spain
    • Faculté Polydisciplinaire de Taroudant, Université Ibn Zohr, Agadir, Hay El Mohammadi (Lastah),BP: 271, 83000 Taroudant, Morocco. E-mail: gaitbaddi@yahoo.fr

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  • Jose Antonio Alburquerque,

    1. Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura, 30100 Murcia, Spain
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  • German Tortosa,

    1. Department of Soil Microbiology and Symbiotic Systems. Estación Experimental del Zaidín (EEZ), Agencia CSIC, 18080-Granada, Spain
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  • Peter Winterton,

    1. Université Paul Sabatier, Toulouse, France
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  • Mohamed Hafidi,

    1. Laboratoire Ecologie et Environnement (Unité associée au CNRST, URAC 32, Unité associée au CNERS), Département de Biologie, Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, Morocco
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  • Juan Cegarra

    1. Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura, 30100 Murcia, Spain
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  • This article was published online on 31 October 2012. An error was subsequently identified. This notice is included in the online and print versions to indicate that both have been corrected 10 December 2012.

Abstract

Two potential liquid fertilizers were produced from two mature “alperujo” composts by using an alkaline extraction (1M KOH at 70°C). The characteristics of the resulting humic-like substances were compared to those extracted according to the international humic substance society protocol by using elemental analysis, FTIR and fluorescence spectroscopy in both excitation-emission matrix and synchronous modes. The results obtained confirmed that the hot alkaline extraction dissolved more polymerized compounds, probably including lignin degradation by-products and/or newly formed aromatic materials. On the other hand, based on fluorescence excitation-emission matrix results, different Δλ (18, 66, and 100 nm) were selected to provide more information about humic substances in synchronous mode. The results showed that the extracted humic-like substances presented characteristics close to those of standard humic materials. As a consequence, the alkaline extraction of “alperujo” compost with 1M KOH at 70°C can be used to produce liquid organic fertilizers, thus diversifying the marketable products obtained from “alperujo,” the most abundant by-product of the Spanish olive-oil extraction industry. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 1170–1178, 2013

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