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Removal of pyrene by different microalgal species

机译:不同微藻种对的去除

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The efficiency of seven microalgal species, namely, Chlamydomonas sp., Chlorella miniata, Chlorella vulgaris, Scenedesmus platydiscus, Scenedesmus quadricauda, Selenastrum capricornutum, and Synechosystis sp. to remove pyrene from solution varied from species to species. According to the 6-hour, 12-hour, and 7-day exposure data, S. capricornutum was the most efficient species in the removal of pyrene, followed by S. platydiscus (a local isolate), and the least effective species was C. vulgaris. For all species, the removal was very rapid in the first 3 to 6 hours of treatment, and no significant difference was found between live and dead cells of C. miniata, C. vulgaris and S. capricornutum, indicating that the initial removal was due to passive physico-chemical biosorption. More than 65% of the pyrene adsorbed was bound on cell wall materials of S. capricornutum, suggesting the major binding sites were on cell walls. The pyrene removal was also dependent on the concentration of algal biomass used, the more the biomass the higher the removal percentages. In addition to biosorption, pyrene was accumulated and transformed inside live cells. In 7-day S. capricornutum culture, pyrene was not detected in either culture medium or algal pellets, and pyrene might have been completely transformed by this species. The degree of bioaccumulation and biotransformation was species specific. [References: 19]
机译:七个微藻物种的效率,分别为衣藻,小球藻,小球藻,桔梗,小球藻,七叶硒,和Syneschosystis sp。从溶液中去除pyr的方法因物种而异。根据6小时,12小时和7天的暴露数据,S。capricornutum是去除pyr的最有效物种,其次是S. platydiscus(本地分离株),最不活跃的物种为C寻常对于所有物种,在处理的最初3到6个小时中清除速度非常快,小旋毛虫,寻常小球藻和小球藻的活细胞和死细胞之间没有发现显着差异,这表明最初的清除是由于被动理化生物吸附。所吸附的the中有超过65%结合在S. capricornutum的细胞壁材料上,表明主要的结合位点在细胞壁上。 removal的去除还取决于所用藻类生物质的浓度,生物质越多,去除率越高。除生物吸附外,pyr在活细胞内积累并转化。在7天的无核链球菌培养中,在培养基或藻类沉淀物中均未检测到pyr,并且this可能已被该物种完全转化。生物积累和生物转化的程度是物种特异性的。 [参考:19]

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