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Sustainability 2016, 8(11), 1150; doi:10.3390/su8111150

Energetic Valorization of Wet Olive Mill Wastes through a Suitable Integrated Treatment: H2O2 with Lime and Anaerobic Digestion

Department of Environmental and Chemical Engineering, University of Calabria, 87036 Rende, CS, Italy
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Author to whom correspondence should be addressed.
Academic Editor: Michael Wachendorf
Received: 17 August 2016 / Revised: 27 October 2016 / Accepted: 5 November 2016 / Published: 9 November 2016
(This article belongs to the Special Issue Biomass Energy Conversion)
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Abstract

In the Mediterranean region, the disposal of residues of olive oil industries represents an important environmental issue. In recent years, many techniques were proposed to improve the characteristics of these wastes with the aim to use them for methane generation in anaerobic digestion processes. Nevertheless, these techniques, in many cases, result costly as well as difficult to perform. In the present work, a simple and useful process that exploits H2O2 in conjunction with lime is developed to enhance the anaerobic biodegradability of wet olive mill wastes (WMOW). Several tests were performed to investigate the influence of lime amount and H2O2 addition modality. The treatment efficiency was positively affected by the increase of lime dosage and by the sequential addition of hydrogen peroxide. The developed process allows reaching phenols abatements up to 80% and volatile fatty acids productions up to 90% by using H2O2 and Ca(OH)2 amounts of 0.05 gH2O2/gCOD and 35 g/L, respectively. The results of many batch anaerobic digestion tests, carried out by means of laboratory equipment, proved that the biogas production from fresh wet olive mill wastes is hardly achievable. On the contrary, organic matter abatements, around to 78%, and great methane yields, up to 0.34–0.35 LCH4/gCODremoved, were obtained on pretreated wastes. View Full-Text
Keywords: anaerobic digestion; hydrogen peroxide; methane; olive mill wastes anaerobic digestion; hydrogen peroxide; methane; olive mill wastes
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Siciliano, A.; Stillitano, M.A.; Limonti, C. Energetic Valorization of Wet Olive Mill Wastes through a Suitable Integrated Treatment: H2O2 with Lime and Anaerobic Digestion. Sustainability 2016, 8, 1150.

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