Extracellular polymeric substrates of Chlorella vulgaris F1068 weaken stress of cetyltrimethyl ammonium chloride on ammonium uptake.
Extracellular polymeric substrates of Chlorella vulgaris F1068 weaken stress of cetyltrimethyl ammonium chloride on ammonium uptake.
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DOI：
10.1016/j.scitotenv.2018.12.472
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发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
Feng Li;Y. Kuang;Na Liu;Fei Ge
中科院分区：
文献类型：
--
作者：
Feng Li;Y. Kuang;Na Liu;Fei Ge
研究了城市污水中新出现的季铵化合物（QAC）--十六烷基三甲基三甲基氯化铵（CTAC）对人工去除EPS（EPS-R）和天然包覆EPS（EPS-C）的小球藻F1068细胞在不同情景（如：CTAC的存在或不存在，不同的光周期序列（光照12小时：黑暗12小时或黑暗12小时：光照12小时））。结果表明，EPS的去除促进了NH 4+的迁移和吸收，但EPS的存在对NH 4+有一定的阻隔作用，有效地减弱了CTAC（<0.5mg/L）对NH 4+吸收的胁迫。其主要作用机制为：0.1 ~ 0.5mg/L的CTAC诱导藻细胞胞外多糖和蛋白质含量增加，从而保护藻细胞膜透性和谷氨酰胺合成酶活性等正常生理功能不受CTAC（0.1 ~ 0.5mg/L）的损害，而与光周期顺序无关。因此，本研究的结果为今后藻类在污水处理中的应用提供了有益的参考。
This study investigated the influences of cetyltrimethyl trimethyl ammonium chloride (CTAC), an emerging pollutant quaternary ammonium compound (QAC) in municipal effluents, on the transfer and uptake of NH4+byChlorella vulgarisF1068 cells removed EPS artificially (EPS-R) and coated EPS naturally (EPS-C) under different scenarios (e.g., the presence or absence of CTAC, different photoperiod sequences (light 12 h: dark 12 h or dark 12 h: light 12 h)). The results showed that the removal of EPS increased the transfer and uptake of NH4+but the presence of EPS caged NH4+and effectively weakened the stress of CTAC (<0.5 mg/L) on NH4+uptake. The main mechanism was considered that CTAC in the concentration range from 0.1 to 0.5 mg/L induced an increased amount of polysaccharide and protein in EPS and thus protected algal normal physiological functions (including cell membrane permeability and glutamine synthetase activity) from the damage of CTAC (0.1 to 0.5 mg/L) regardless of the photoperiod sequences. Thereby, the findings of this study provided an insight into the role of algal EPS in transfer and uptake of nutrients under the coexisted toxics for the future algae-based sewage treatment application.