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Sci Total Environ. 2019 Nov 16:135537. doi: 10.1016/j.scitotenv.2019.135537. [Epub ahead of print]

Bioremediation of Olive Mill Wastewater sediments in evaporation ponds through in situ composting assisted by bioaugmentation.

Author information

1
Unit of Microbiology, Department of Biology and Geology, CITE II-B, Agrifood Campus of International Excellence ceiA3; CIAMBITAL, University of Almeria, 04120 Almeria, Spain.
2
Unit of Microbiology, Department of Biology and Geology, CITE II-B, Agrifood Campus of International Excellence ceiA3; CIAMBITAL, University of Almeria, 04120 Almeria, Spain. Electronic address: mllopez@ual.es.
3
Department of Agrochemistry and Environment, Miguel Hernández University, EPS-Orihuela, Ctra. Beniel Km 3.2, 03312 Orihuela (Alicante), Spain.

Abstract

The common method for the disposal of olive oil mill wastewater (OMW) has been its accumulation in evaporation ponds where OMW sediments concentrate. Due to the phytotoxic and antimicrobial effect of OMW, leaks from ponds can pollute soils and water bodies. This work focuses on the search for microorganisms that can be used as inocula for bioremediation of polluted matrices in OMW ponds by means of in situ composting. Two fungi isolated from OMW sediments, Aspergillus ochraceus H2 and Scedosporium apiospermum H16, presented suitable capabilities for this use as a consortium. Composting eliminated the phyto- and ecotoxicity of OMW sediments by depleting their main toxic components. Inoculation with the fungal consortium improved the bioremediation efficacy of the technique by hastening the decrease of phytotoxicity and ecotoxicity and enhancing phytostimulant property of compost produced. This procedure constitutes a promising strategy for bioremediation of OMW polluted sites.

KEYWORDS:

Aspergillus ochraceus; Ecotoxicity; In situ composting; Phenolic compounds; Phytotoxicity; Scedosporium apiospermum

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