Effectiveness of Shewanella oneidensis bioaugmentation in the bioremediation of phenanthrene-contaminated sediments and possible consortia with omnivore-carnivore meiobenthic nematodes

生物强化 生物修复 微观世界 环境化学 生物 食品科学 化学 生态学 污染
作者
Mounir Yeferni,Olfa Ben Saïd,Ezzeddine Mahmoudi,Naceur Essid,Amor Hedfi,Mohammed Almalki,Octavian Pacioglu,Aida Dervishi,Fehmi Boufahja
出处
期刊:Environmental Pollution [Elsevier BV]
卷期号:292: 118281-118281 被引量:8
标识
DOI:10.1016/j.envpol.2021.118281
摘要

This study was conducted to assess the impact and efficiency of the bioaugmentation as a bioremediation technique in annoying effects of a polycyclic aromatic hydrocarbon (phenanthrene) on a community of free-living nematodes from Bizerte bay (Tunisia). For this purpose, closed microcosms were exposed to three doses of phananthrene (0.1 μg kg-1, 1 μg kg-1 and 10 μg kg-1), in combination or not with a strain of Shewanella oneidensis. After 40 days of the exposure, results were obtained at the numerical, taxonomic and feeding levels. The results of univariate analyses revealed significant decreases in most univariate indices for phenanthrene treated communities compared to controls, with a discernible increase in the proportion of epistrate feeders. After bioaugmentation, similar patterns were observed for univariate and multivariate analyses, with the exception of the highest treatment, which showed no difference from the controls. The results obtained showed that the bioaugmentation with Shewanellea oneidensis was highly effective in reducing the negative impact of the highest dose of phenanthrene (10 μg kg-1 Dry Weight) tested on meiobenthic nematodes. Furthermore, a combination of Shewanellea oneidensis and four omnivore-carnivore nematode taxa could be suggested as an effective method in the bioremediation of phenanthrene-contaminated sediment.
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