Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments
The olive-oil industry generates large amounts of residues that, in the past, were accumulated in evaporating ponds in many Mediterranean countries. Currently, these open-air ponds pose a serious environmental hazard because of toxic chemicals that concentrate in their sediments. Bioremediation of o...
| Main Authors: | , , , , |
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| Format: | info:eu-repo/semantics/article |
| Language: | English |
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MDPI
2020
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10835/7996 |
| _version_ | 1789406458595508224 |
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| author | Sanchez Hernandez, Juan C. Sáez, José A. Vico, Alberto Moreno Casco, José Joaquín Moral, Raúl |
| author_facet | Sanchez Hernandez, Juan C. Sáez, José A. Vico, Alberto Moreno Casco, José Joaquín Moral, Raúl |
| author_sort | Sanchez Hernandez, Juan C. |
| collection | DSpace |
| description | The olive-oil industry generates large amounts of residues that, in the past, were accumulated in evaporating ponds in many Mediterranean countries. Currently, these open-air ponds pose a serious environmental hazard because of toxic chemicals that concentrate in their sediments. Bioremediation of olive mill waste (OMW) sediments has emerged as a viable option for managing this environmentally problematic residue. Here, we postulate that inoculation of an OMW-soil mixture with earthworms may be a complementary bioremediation strategy to that using native microorganisms only. A laboratory study assessed the ecotoxicity of OMW-amended soils (10%, 20%, 40% and 80% w/w) combining earthworm biomarker responses and soil enzyme activities. The doses of 40% and 80% were toxic to earthworms, as evidenced by the high mortality rate, loss of body weight and signs of oxidative stress after 30 d of soil incubation. Conversely, doses ≤ 20% w/w were compatible with earthworm activity, as indicated by the significant increase of soil enzyme activities. Total concentrations of phenolic compounds decreased by more than 70% respect to initial concentrations in 10% and 20% OMW treatments. These results suggest that OMW sediments intentionally mixed with soils in an up to 20% proportion is a workable bioremediation strategy, where earthworms can be inoculated to facilitate the OMW degradation. |
| format | info:eu-repo/semantics/article |
| id | oai:repositorio.ual.es:10835-7996 |
| institution | Universidad de Cuenca |
| language | English |
| publishDate | 2020 |
| publisher | MDPI |
| record_format | dspace |
| spelling | oai:repositorio.ual.es:10835-79962023-04-12T18:58:14Z Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments Sanchez Hernandez, Juan C. Sáez, José A. Vico, Alberto Moreno Casco, José Joaquín Moral, Raúl earthworm ecotoxicology oxidative stress soil enzymes bioremediation Lumbricus terrestris The olive-oil industry generates large amounts of residues that, in the past, were accumulated in evaporating ponds in many Mediterranean countries. Currently, these open-air ponds pose a serious environmental hazard because of toxic chemicals that concentrate in their sediments. Bioremediation of olive mill waste (OMW) sediments has emerged as a viable option for managing this environmentally problematic residue. Here, we postulate that inoculation of an OMW-soil mixture with earthworms may be a complementary bioremediation strategy to that using native microorganisms only. A laboratory study assessed the ecotoxicity of OMW-amended soils (10%, 20%, 40% and 80% w/w) combining earthworm biomarker responses and soil enzyme activities. The doses of 40% and 80% were toxic to earthworms, as evidenced by the high mortality rate, loss of body weight and signs of oxidative stress after 30 d of soil incubation. Conversely, doses ≤ 20% w/w were compatible with earthworm activity, as indicated by the significant increase of soil enzyme activities. Total concentrations of phenolic compounds decreased by more than 70% respect to initial concentrations in 10% and 20% OMW treatments. These results suggest that OMW sediments intentionally mixed with soils in an up to 20% proportion is a workable bioremediation strategy, where earthworms can be inoculated to facilitate the OMW degradation. 2020-04-13T11:17:58Z 2020-04-13T11:17:58Z 2020-04-10 info:eu-repo/semantics/article 2076-3417 http://hdl.handle.net/10835/7996 en https://www.mdpi.com/2076-3417/10/7/2624 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess MDPI |
| spellingShingle | earthworm ecotoxicology oxidative stress soil enzymes bioremediation Lumbricus terrestris Sanchez Hernandez, Juan C. Sáez, José A. Vico, Alberto Moreno Casco, José Joaquín Moral, Raúl Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments |
| title | Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments |
| title_full | Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments |
| title_fullStr | Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments |
| title_full_unstemmed | Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments |
| title_short | Evaluating Earthworms’ Potential for Remediating Soils Contaminated with Olive Mill Waste Sediments |
| title_sort | evaluating earthworms’ potential for remediating soils contaminated with olive mill waste sediments |
| topic | earthworm ecotoxicology oxidative stress soil enzymes bioremediation Lumbricus terrestris |
| url | http://hdl.handle.net/10835/7996 |
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