Spent lubricant oil-contaminated soil toxicity to Eisenia andrei before and after bioremediation
| Autor: | Sanye Soroldoni, Graciane Silva, Márcia Martins Marques, Fábio Veríssimo Correia |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Bioaugmentation Time Factors Environmental remediation Health Toxicology and Mutagenesis Eisenia andrei 010501 environmental sciences Management Monitoring Policy and Law engineering.material Toxicology complex mixtures 01 natural sciences Biostimulation Soil Bioremediation Toxicity Tests Acute Animals Soil Pollutants Petroleum Pollution Oligochaeta Toxicity Tests Chronic Chronic toxicity 0105 earth and related environmental sciences biology Chemistry Compost General Medicine biology.organism_classification Soil contamination 010602 entomology Biodegradation Environmental Environmental chemistry engineering |
| Zdroj: | Ecotoxicology. 28:212-221 |
| ISSN: | 1573-3017 0963-9292 |
| Popis: | Bioremediation is very efficient in biodegrading petroleum hydrocarbons. However, the decrease in these target contaminants in soils is not necessarily followed by a decrease in toxicity. The remaining contaminants can be enough to retain toxicity, while incomplete degradation of several compounds can generate sub-products, which can be even more toxic. In this context, the aim of this study was to assess acute and chronic toxicity in Eisenia andrei exposed to soil contaminated with 5% spent lubricant oil before and after 22 months of bioremediation in 150 L aerobic reactors. Applied bioremediation strategies were biostimulation (BIOS), bioaugmentation by adding mature compost from municipal solid waste (BIOA1) and bioaugmentation by adding non-mature compost from municipal solid waste (BIOA2). After 22 months, total petroleum hydrocarbons (TPH) were reduced 71% in BIOS and 73% in both BIOA1 and BIOA2. Polycyclic aromatic hydrocarbons (PAH) were reduced in about 98% in all treatments (BIOS, BIOA1 and BIOA2). At the 14th day of exposure, mortality rates were 7 ± 2, 20 ± 0, 75 ± 25, 93 ± 12 and 100 ± 0% for Eisenia andrei exposed to CONT (soil with no oil addition), BIOS, OLU (soil newly contaminated with 5% spent oil), BIOA1 and BIOA2, respectively. After 14 days, surviving specimens in both BIOS and OLU soils exhibited anatomic deformations, less biomass than the controls, and decrease in juvenile forms and coelomocytes. After 28 days, the mortality rate for BIOS and OLU soils increased to 97 and 100%, respectively. Therefore, even with a reduction of 71–73% for TPH and 98% for PAH, toxic effects remained in all soils bioremediated, probably due to the remaining hydrocarbons and/or hydrocarbon biodegradation products. The results indicate that both chemical analyses and toxicological monitoring are required to follow-up soil remediation progress. |
| Databáze: | OpenAIRE |
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