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Olive oil mill wastewaters before and after treatment: a critical review from the ecotoxicological point of view

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Abstract

The olive oil mill wastewater (OMW) is a problematic and polluting effluent which may degrade the soil and water quality, with critical negative impacts on ecosystems functions and services provided. The main purpose of this review paper is presenting the state of the art of OMW treatments focusing on their efficiency to reduce OMW toxicity, and emphasizing the role of ecotoxicological tests on the evaluation of such efficiency before the up-scale of treatment methodologies being considered. In the majority of research works, the reduction of OMW toxicity is related to the degradation of phenolic compounds (considered as the main responsible for the toxic effects of OMW on seed germination, on bacteria, and on different species of soil and aquatic invertebrates) or the decrease of chemical oxygen demand content, which is not scientifically sound. Batteries of ecotoxicological tests are not applied before and after OMW treatments as they should be, thus leading to knowledge gaps in terms of accurate and real assessment of OMW toxicity. Although the toxicity of OMW is usually high, the evaluation of effects on sub-lethal endpoints, on individual and multispecies test systems, are currently lacking, and the real impacts yielded by its dilution, in freshwater trophic chains of receiving systems can not be assessed. As far as the terrestrial compartment is considered, ecotoxicological data available include tests only with plants and the evaluation of soil microbial parameters, reflecting concerns with the impacts on crops when using OMW for irrigation purposes. The evaluation of its ecotoxicity to other edaphic species were not performed giving rise to a completely lack of knowledge about the consequences of such practice on other soil functions. OMW production is a great environmental problem in Mediterranean countries; hence, engineers, chemists and ecotoxicologists should face this problem together to find an ecologically friend solution.

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Acknowledgments

This work was developed under the scope of the FCT (Fundação para a Ciência e a Tecnologia, Portugal) research grants (SFRH/BD/60429/2009 and SFRH/BPD/65410/2009) funded by QREN-POPH co-financed by the European Social Fund and Portuguese National Funds from MCTES, through FSE and POPH funds (Programa Ciência 2007) and through the bilateral cooperation FCT/CNRST.

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  1. Department of Chemistry and CESAM, University of Aveiro, 3810-193, Aveiro, Portugal

    Celine I. L. Justino, Ana C. Freitas, Teresa A. P. Rocha-Santos & Armando C. Duarte

  2. Department of Biology and CESAM, University of Aveiro, 3810-193, Aveiro, Portugal

    Ruth Pereira

  3. ISEIT/Viseu, Instituto Piaget, Estrada do Alto do Gaio, Galifonge, 3515-776, Lordosa, Viseu, Portugal

    Ana C. Freitas, Teresa A. P. Rocha-Santos & Teresa S. L. Panteleitchouk

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Justino, C.I.L., Pereira, R., Freitas, A.C. et al. Olive oil mill wastewaters before and after treatment: a critical review from the ecotoxicological point of view. Ecotoxicology 21, 615–629 (2012). https://doi.org/10.1007/s10646-011-0806-y

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