期刊
RSC ADVANCES
卷 5, 期 82, 页码 67335-67342出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra07106b
关键词
-
资金
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, China
- Key Laboratory of Urban Water Resource and Environment of Harbin institute of technology, China [ES201312]
Zinc oxide (ZnO) nanoparticles (NPs) have been reported to induce adverse effects on organisms. The impacts of ZnO NPs on nitrification and the nitrobacteria community in activated sludge were investigated in a simulated SBR. It revealed that ZnO NPs at low concentrations (5 and 10 mg L-1) slightly inhibited nitrification. At these concentrations the activity of ammonia monooxygenase (AMO) and nitrite oxidoreductase (NOR) as well as the cell membrane integrity of Nitrosomonas europaea were almost unaffected. Concentrations of 20 mg L-1 and 50 mg L-1 ZnO NPs had significantly adverse effects on the activity of AMO and NOR and on the transformation of NH4+-N to NO2--N and NO2--N to NO3--N. Analysis by denaturing gradient gel electrophoresis (DGGE) revealed that higher concentrations of ZnO NPs significantly inhibited the growth of the typical ammonia-oxidizing bacteria (AOB) that were mainly responsible for oxidation of ammonia to nitrate. Moderate concentrations of ZnO NPs could accelerate the growth of some types of denitrifying bacteria and promote the growth of some pathogenic bacteria. Moderate and high concentrations of ZnO NPs could obviously destroy the integrity of the cell membrane of Nitrosomonas europaea. These findings meaningfully assessed the adverse effects of ZnO NPs on activated sludge in wastewater treatment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据