期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 661, 期 -, 页码 678-684出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.12.472
关键词
Extracellular polymeric substrates; Chlorella vulgaris; Quaternary ammonium compounds; Ammonium flux; Municipal sewage
资金
- National Natural Science Foundation of China [21577117, 21577118]
- China Postdoctoral Science Foundation [2016M590749, 2017T100605]
- Natural Science Foundation of Hunan Province [2016JJ1024]
- Key Research and Development Plan of Hunan Province [2018SK2045, 2018SK2042]
- General Research Foundation of Education Bureau of Hunan Province [15C1316]
- Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization
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+ by Chlorella vulgaris F1068 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. (C) 2018 Published by Elsevier B.V.
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