Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China.
Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China.
Bioresour Technol. 2016 Nov;220:262-270. doi: 10.1016/j.biortech.2016.08.086. Epub 2016 Aug 26.
The performance, microbial enzymatic activity and microbial community of a sequencing batch reactor (SBR) were investigated under long-term exposure to cerium dioxide nanoparticles (CeO2 NPs). The COD removal kept a stable value at 0-5mg/L CeO2 NPs and then decreased at 10-60mg/L CeO2 NPs. The NH4(+)-N removal had no obvious changes at 0-30mg/L CeO2 NPs, and a minor decrease appeared at 60mg/L CeO2 NPs. Compared to 0mg/L CeO2 NPs, the phosphorus removal showed a decrease at 2mg/L CeO2 NPs and slightly increased at 5-60mg/L CeO2 NPs. The nitrogen and phosphorus removal rates had similar variation trends to the microbial enzymatic activities. The variations of reactive oxygen species (ROS) and lactate dehydrogenase (LDH) indicated that high CeO2 NPs concentration could result in the biotoxicity to activated sludge. The presence of CeO2 NPs had obvious effect on the microbial richness and diversity of activated sludge.
在长期暴露于二氧化铈纳米颗粒（CeO2 NPs）的条件下，研究了序批式反应器（SBR）的性能、微生物酶活性和微生物群落。在 0-5mg/L CeO2 NPs 范围内，COD 去除率保持稳定值，然后在 10-60mg/L CeO2 NPs 范围内下降。在 0-30mg/L CeO2 NPs 范围内，NH4(+)-N 去除率没有明显变化，而在 60mg/L CeO2 NPs 时略有下降。与 0mg/L CeO2 NPs 相比，在 2mg/L CeO2 NPs 时磷去除率下降，在 5-60mg/L CeO2 NPs 时略有增加。氮和磷去除率与微生物酶活性具有相似的变化趋势。活性氧（ROS）和乳酸脱氢酶（LDH）的变化表明，高浓度的 CeO2 NPs 会导致活性污泥的生物毒性。CeO2 NPs 的存在对活性污泥的微生物丰富度和多样性有明显影响。
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