期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 708, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.135063
关键词
Alcaligenes sp. TB; Denitrification; nZVI/Pd; Membrane resistance; Trans/cis isomerization
资金
- Natural Science Foundation of Zhejiang Province [LY17E080018]
- Natural Science Foundation of China [21777142]
- National Key Research and Development Program of China [2018YFE0120300]
The microbial reduction of nitrate in the presence of nanoscale zero-valent iron (nZVI) was evaluated to assess the feasibility of employing nZVI for biological denitrification treatment. The effect of modified nZVI on the growth, metabolism, and denitrification performance of Alcaligenes sp. TB under aerobic conditions was studied. Results showed that Alcaligenes sp. TB with nZVI/Pd had 31.5% increase in nitrate removal and 18.1% decrease in nitrite accumulation within 28 h. nZVI/Pd exhibited less inhibition on the cell growth (OD600 = 0.725), NADH/NAD* ratio (86% of control), and electron transfer system activity (68.5% of control). In addition, nZVI/Pd decreased the membrane fluidity by increasing the trans/cis isomerization ratio (317.7% of control) to enhance the resistance of nZVI. This study underlines the effects of nZVI/Pd on membrane susceptibility via membrane fatty acid transformation during denitrification and suggests the influence of engineered nanomaterials on denitrification. (C) 2019 Elsevier B.V. All rights reserved.
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