Faculty of Sciences of Bizerte, LR01ES14 Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, University of Carthage, 7021, Zarzouna, Tunisia.
LR Biotechnology and Bio-Geo Resources Valorization (LR11ES31c) Higher Institute for Biotechnology, University of Manouba Biotechnopole of Sidi Thabet, 2020, Sidi Thabet, Ariana, Tunisia.
Environ Sci Pollut Res Int. 2022 Jan;29(2):2566-2578. doi: 10.1007/s11356-021-15844-9. Epub 2021 Aug 9.
A microcosm bioassay was designed to assess the efficacy of wastewater treatment methods used in sewage plants. The taxonomic and feeding characteristics of a meiobenthic nematode assemblage from Ghar El Melh lagoon (Tunisia) were used to achieve this goal. Nematode assemblages were exposed for 30 days to untreated wastewater (UW) obtained from the sewage treatment plant of Sidi Ahmed (Tunisia) and three mixtures with treated wastewater (TW33 = 33%, TW66 = 66%, and TW100 = 100%). Concerning the nematode abundance, the exposure to either treated wastewater (TW33-100) or untreated wastewater (UW) had no significant effect. In contrast, Shannon-Wiener index and Pielou's Evenness were clearly reduced by contamination with both types of wastewater, with a more pronounced negative impact prior to treatment in the sewage plant. The multivariate analyzes revealed a change in the taxonomic composition of the nematofauna in response to the contamination by untreated or treated wastewater. The relative abundances of species in wastewater replicates compared to controls reflected this taxonomic restructuring. Finally, Ascolaimus elongatus, Terschellingia communis, and Kraspedonema octogoniata were less represented in all experimentally treated units and could be considered as 'sensitive taxa to wastewater'. While, Paracomesoma dubium, appears to be a 'tolerant and/or opportunistic' species, showing increased relative abundances under all wastewater treatments.
设计了一个微宇宙生物测定法来评估污水处理厂使用的废水处理方法的功效。使用来自盖尔梅尔赫泻湖（突尼斯）的小型底栖线虫组合的分类和摄食特征来实现这一目标。线虫组合在 30 天内暴露于来自突尼斯锡德艾哈迈德污水处理厂的未经处理的废水（UW）和三种与处理后的废水的混合物（TW33 = 33%、TW66 = 66%和 TW100 = 100%）中。关于线虫丰度，暴露于处理后的废水（TW33-100）或未经处理的废水（UW）都没有显着影响。相比之下，受两种类型的废水污染后，香农威纳指数和皮尔欧均匀度明显降低，在污水处理厂处理前的负面影响更为明显。多元分析显示，线虫动物群的分类组成因受未经处理或处理后的废水污染而发生变化。与对照相比，废水中的物种相对丰度反映了这种分类重构。最后，伸长棘唇线虫、普通三角真吻棘虫和八角小杆线虫在所有实验处理单元中的相对丰度都较低，可被认为是“对废水敏感的分类群”。而，Paracomesoma dubium似乎是一种“耐受和/或机会主义”的物种，在所有废水处理下的相对丰度都增加。
