期刊
BIORESOURCE TECHNOLOGY
卷 347, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126389
关键词
Wastewater; Free nitrous acid; Microalgae; Microalgal-bacterial consortium; Nitritation
资金
- National Natural Science Foundation of China [52170038, 52000103]
- Fundamental Research Funds for the Central Universities [30921011219, 30920021117]
- Natural Science Foundation of Jiangsu Prov-ince [BK20190022, BK20180497]
- Distinguished Professorship of Jiangsu Province
- China Association for Science and Technology
This study revealed the multi-targeted responses of the model wastewater microalgae, Chlorella sorokiniana, to FNA exposure. The findings showed that FNA negatively influenced microalgal growth and photosynthesis, increased oxidative stress, and altered gene expression. These results are crucial for understanding the stability of the MBCP system and its potential application in wastewater treatment.
Microalgal-bacterial consortium process (MBCP) proposed as an alternative to the activated sludge process contains free nitrous acid (FNA). FNA antimicrobial influences on nitrifiers have been demonstrated. However, its influence on microalgae is largely unknown, limiting the system stability of MBCP. This study revealed the multi-targeted responses of a model wastewater microalgae, Chlorella sorokiniana, to FNA exposure through physiological and transcriptomic analyses. Results showed a concentration-dependent FNA-influence as both microalgal growth and photosynthesis (Fv/Fm, rETR, Y(II), NPQ) inversely correlated with FNA doses. Increased ROS, MDA content (5.0-fold), SOD (2.7-fold), and LDH (12.0-fold) activities in the treatments revealed FNAinduced oxidative pressure. Moreover, RNA-sequencing results revealed significantly downregulated genes related to photosynthesis, respiration, nitrogen metabolism, and tricarboxylic acid cycle. Comparatively, peroxisome, chlorophyll, and carotenoid genes were upregulated. These findings elucidate the inhibitory mechanisms of FNA on microalgae and contribute towards the prospective practical application of the MBCP system for sustainable wastewater treatment.
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